From: Stefan Kangas Date: Thu, 11 Nov 2021 06:17:56 +0000 (+0100) Subject: Merge from origin/emacs-28 X-Git-Tag: emacs-29.0.90~3668^2~57 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=3e234943940534cc55062b04db41000531f02615;p=emacs.git Merge from origin/emacs-28 2963de6540 * lisp/vc/vc-git.el (vc-git-mergebase): More meaningful er... a9148cdee5 ; Fix heading in etc/NEWS 9623342216 ; * etc/NEWS: Move a bookmark related item further down. # Conflicts: # etc/NEWS --- 3e234943940534cc55062b04db41000531f02615 diff --cc etc/NEWS.28 index d415a242fcb,00000000000..8e38c3690c1 mode 100644,000000..100644 --- a/etc/NEWS.28 +++ b/etc/NEWS.28 @@@ -1,4602 -1,0 +1,4601 @@@ +GNU Emacs NEWS -- history of user-visible changes. + +Copyright (C) 2019-2021 Free Software Foundation, Inc. +See the end of the file for license conditions. + +Please send Emacs bug reports to 'bug-gnu-emacs@gnu.org'. +If possible, use 'M-x report-emacs-bug'. + +This file is about changes in Emacs version 28. + +See file HISTORY for a list of GNU Emacs versions and release dates. +See files NEWS.27, NEWS.26, ..., NEWS.18, and NEWS.1-17 for changes +in older Emacs versions. + +You can narrow news to a specific version by calling 'view-emacs-news' +with a prefix argument or by typing 'C-u C-h C-n'. + +Temporary note: ++++ indicates that all relevant manuals in doc/ have been updated. +--- means no change in the manuals is needed. +When you add a new item, use the appropriate mark if you are sure it +applies, and please also update docstrings as needed. + + +* Installation Changes in Emacs 28.1 + +** Emacs now optionally supports native compilation of Lisp files. +To enable this, configure Emacs with the '--with-native-compilation' option. +This requires the libgccjit library to be installed and functional, +and also requires GCC and Binutils to be available when Lisp code is +natively compiled. See the Info node "(elisp) Native Compilation" for +more details. + +If you build Emacs with native compilation, but without zlib, be sure +to configure with the '--without-compress-install' option, so that the +installed *.el files are not compressed; otherwise, you will not be +able to use JIT native compilation of the installed *.el files. + +Note that JIT native compilation is done in a fresh session of Emacs +that is run in a subprocess, so it can legitimately report some +warnings and errors that aren't uncovered by byte-compilation. We +recommend examining any such warnings before you decide they are +false. + +** The Cairo graphics library is now used by default if present. +'--with-cairo' is now the default, if the appropriate development files +are found by 'configure'. Note that building with Cairo means using +Pango instead of libXFT for font support. Since Pango 1.44 has +removed support for bitmapped fonts, this may require you to adjust +your font settings. + +Note also that 'FontBackend' settings in ".Xdefaults" or +".Xresources", or 'font-backend' frame parameter settings in your init +files, may need to be adjusted, as 'xft' is no longer a valid backend +when using Cairo. Use 'ftcrhb' if your Emacs was built with HarfBuzz +text shaping support, and 'ftcr' otherwise. You can determine this by +checking 'system-configuration-features'. The 'ftcr' backend will +still be available when HarfBuzz is supported, but will not be used by +default. We strongly recommend building with HarfBuzz support. 'x' is +still a valid backend. + +--- +** 'configure' now warns about building with libXft support. +libXft is unmaintained, and causes a number of problems with modern +fonts including but not limited to crashes; support for it may be +removed in a future version of Emacs. Please consider using +Cairo + HarfBuzz instead. + +--- +** 'configure' now warns about not using HarfBuzz if using Cairo. +We want to encourage people to use the most modern font features +available, and this is the Cairo graphics library + HarfBuzz for font +shaping, so 'configure' now recommends that combination. + +--- +** Building without double buffering support. +'configure --with-xdbe=no' can now be used to disable double buffering +at build time. + +--- +** Support for building with Motif has been removed. + +--- +** The configure option '--without-makeinfo' has been removed. +This was only ever relevant when building from a repository checkout. +This now requires makeinfo, which is part of the texinfo package. + +--- +** New configure option '--disable-year2038'. +This causes Emacs to use only 32-bit time_t on platforms that have +both 32- and 64-bit time_t. This may help when linking Emacs with a +library with an ABI requiring traditional 32-bit time_t. This option +currently affects only 32-bit ARM and x86 running GNU/Linux with glibc +2.34 and later. Emacs now defaults to 64-bit time_t on these +platforms. + +--- +** Support for building with '-fcheck-pointer-bounds' has been removed. +GCC has withdrawn the '-fcheck-pointer-bounds' option and support for +its implementation has been removed from the Linux kernel. + +--- +** The ftx font backend driver has been removed. +It was declared obsolete in Emacs 27.1. + +--- +** Emacs no longer supports old OpenBSD systems. +OpenBSD 5.3 and older releases are no longer supported, as they lack +proper pty support that Emacs needs. + + +* Startup Changes in Emacs 28.1 + +--- +** In GTK builds, Emacs now supports startup notification. +This means that Emacs won't steal keyboard focus upon startup +(when started via the Desktop) if the user is typing into another +application. + +--- +** Errors in 'kill-emacs-hook' no longer prevent Emacs from shutting down. +If a function in that hook signals an error in an interactive Emacs, +the user will be prompted on whether to continue. If the user doesn't +answer within five seconds, Emacs will continue shutting down anyway. + +** Emacs now supports loading a Secure Computing filter. +This is supported only on capable GNU/Linux systems. To activate, +invoke Emacs with the '--seccomp=FILE' command-line option. FILE must +name a binary file containing an array of 'struct sock_filter' +structures. Emacs will then install that list of Secure Computing +filters into its own process early during the startup process. You +can use this functionality to put an Emacs process in a sandbox to +avoid security issues when executing untrusted code. See the manual +page for 'seccomp' system call, for details about Secure Computing +filters. + +** Emacs can support 24-bit color TTY without terminfo database. +If your text-mode terminal supports 24-bit true color, but your system +lacks the terminfo database, you can instruct Emacs to support 24-bit +true color by setting 'COLORTERM=truecolor' in the environment. This is +useful on systems such as FreeBSD which ships only with "etc/termcap". + +--- +** File names given on the command line are now be pushed onto history. +The file names will be pushed onto 'file-name-history', like the names +of files visited via 'C-x C-f' and other commands. + + +* Changes in Emacs 28.1 + +--- +** Emacs now supports Unicode Standard version 14.0. + ++++ +** Improved support for Emoji. +On capable systems, Emacs now correctly displays Emoji and Emoji +sequences by default, provided that a suitable font is available to +Emacs. With a few exceptions, all of the Emoji sequences specified by +Unicode 14.0 are automatically composed and displayed as a single +colorful glyph. This is achieved by changes in the Emacs font +configuration, and by additional character-composition rules for the +Emoji codepoints that follow from the Unicode-defined sequences. + +If your system lacks a suitable font, we recommend to install "Noto +Color Emoji"; Emacs will use it automatically if it's installed. If +you prefer to use another font for Emoji, customize your fontset like +this: + + (set-fontset-font t 'emoji + '("My New Emoji Font" . "iso10646-1") nil 'prepend) + +The Emoji characters are now assigned to a special script, 'emoji', so +as to make it easier to customize fontsets for Emoji display, as in +the above example. (Previously, the Emoji characters were assigned to +the 'symbol' script, together with other symbol and punctuation +characters.) + ++++ +** 'glyphless-char-display-control' now applies to Variation Selectors. +VS-1 through VS-16 are now displayed as 'thin-space' by default when +not composed with previous characters (typically, as part of Emoji +sequences). + ++++ +** New command 'execute-extended-command-for-buffer'. +This new command, bound to 'M-S-x', works like +'execute-extended-command', but limits the set of commands to the +commands that have been determined to be particularly useful with the +current mode. + ++++ +** New user option 'read-extended-command-predicate'. +This user option controls how 'M-x' performs completion of commands when +you type 'TAB'. By default, any command that matches what you have +typed is considered a completion candidate, but you can customize this +option to exclude commands that are not applicable to the current +buffer's major and minor modes, and respect the command's completion +predicate (if any). + ++++ +** Completion on 'M-x' shows key bindings for commands. +When 'suggest-key-bindings' is non-nil (as it is by default), the +completion list popped up by 'M-x' shows the key bindings for all the +commands shown in the list of candidate completions that have a key +binding. + ++++ +** New user option 'completions-detailed'. +When non-nil, some commands like 'describe-symbol' show more detailed +completions with more information in completion prefix and suffix. +The default is nil. + +--- +** 'C-s' in 'M-x' now once again searches over completions. +In Emacs 23, typing 'M-x' ('read-extended-command') and then 'C-s' (to +do an interactive search) would search over possible completions. +This was lost in Emacs 24, but is now back again. + ++++ +** User option 'completions-format' supports a new value 'one-column'. + ++++ +** New system for displaying documentation for groups of functions. +This can either be used by saying 'M-x shortdoc-display-group' and +choosing a group, or clicking a button in the "*Help*" buffers when +looking at the doc string of a function that belongs to one of these +groups. + ++++ +** New minor mode 'context-menu-mode' for context menus popped by 'mouse-3'. +When this mode is enabled, clicking 'down-mouse-3' (usually, the +right mouse button) anywhere in the buffer pops up a menu whose +contents depends on surrounding context near the mouse click. +You can change the order of the default sub-menus in the context menu +by customizing the user option 'context-menu-functions'. You can also +invoke the context menu by pressing 'S-' or, on macOS, by +clicking 'C-down-mouse-1'. + ++++ +** A new keymap for buffer actions has been added. +The 'C-x x' keymap now holds keystrokes for various buffer-oriented +commands. The new keystrokes are 'C-x x g' ('revert-buffer-quick'), +'C-x x r' ('rename-buffer'), 'C-x x u' ('rename-uniquely'), 'C-x x n' +('clone-buffer'), 'C-x x i' ('insert-buffer'), 'C-x x t' +('toggle-truncate-lines') and 'C-x x f' ('font-lock-update'). + ++++ +** Modifiers now go outside angle brackets in pretty-printed key bindings. +For example, 'RET' with Control and Meta modifiers is now shown as +'C-M-' instead of ''. Either variant can be used +as input; functions such as 'kbd' and 'read-kbd-macro' accept both +styles as equivalent (they have done so for a long time). + +--- +** 'eval-expression' no longer signals an error on incomplete expressions. +Previously, typing 'M-: ( RET' would result in Emacs saying "End of +file during parsing" and dropping out of the minibuffer. The user +would have to type 'M-: M-p' to edit and redo the expression. Now +Emacs will echo the message and allow the user to continue editing. + ++++ +** 'eval-last-sexp' now handles 'defvar'/'defcustom'/'defface' specially. +This command would previously not redefine values defined by these +forms, but this command has now been changed to work more like +'eval-defun', and reset the values as specified. + +--- +** New user option 'use-short-answers'. +When non-nil, the function 'y-or-n-p' is used instead of +'yes-or-no-p'. This eliminates the need to define an alias that maps +one to another in the init file. The same user option also controls +whether the function 'read-answer' accepts short answers. + ++++ +** New user option 'kill-buffer-delete-auto-save-files'. +If non-nil, killing a buffer that has an auto-save file will prompt +the user for whether that auto-save file should be deleted. (Note +that 'delete-auto-save-files', if non-nil, was previously documented +to result in deletion of auto-save files when killing a buffer without +unsaved changes, but this has apparently not worked for several +decades, so the documented semantics of this variable has been changed +to match the behavior.) + ++++ +** New user option 'next-error-message-highlight'. +In addition to a fringe arrow, 'next-error' error may now optionally +highlight the current error message in the 'next-error' buffer. +This user option can be also customized to keep highlighting on all +visited errors, so you can have an overview what errors were already visited. + +--- +** New choice 'next-error-quit-window' for 'next-error-found-function'. +When 'next-error-found-function' is customized to 'next-error-quit-window', +then typing the numeric prefix argument 0 before the command 'next-error' +will quit the source window after visiting the next occurrence. + ++++ +** New user option 'file-preserve-symlinks-on-save'. +This controls what Emacs does when saving buffers that visit files via +symbolic links, and 'file-precious-flag' is non-nil. + ++++ +** New user option 'copy-directory-create-symlink'. +If non-nil, will make 'copy-directory' (when used on a symbolic +link) copy the link instead of following the link. The default is +nil, so the default behavior is unchanged. + ++++ +** New user option 'ignored-local-variable-values'. +This is the opposite of 'safe-local-variable-values' -- it's an alist +of variable-value pairs that are to be ignored when reading a +local-variables section of a file. + +--- +** Specific warnings can now be disabled from the warning buffer. +When a warning is displayed to the user, the resulting buffer now has +buttons which allow making permanent changes to the treatment of that +warning. Automatic showing of the warning can be disabled (although +it is still logged to the "*Messages*" buffer), or the warning can be +disabled entirely. + ++++ +** ".dir-locals.el" now supports setting 'auto-mode-alist'. +The new 'auto-mode-alist' specification in ".dir-locals.el" files can +now be used to override the global 'auto-mode-alist' in the current +directory tree. + +--- +** User option 'uniquify-buffer-name-style' can now be a function. +This user option can be one of the predefined styles or a function to +personalize the uniquified buffer name. + +--- +** 'remove-hook' is now an interactive command. + +--- +** 'expand-file-name' now checks for null bytes in filenames. +The function will now check for null bytes in both NAME and +DEFAULT-DIRECTORY arguments, as well as in the 'default-directory' +buffer-local variable, when its value is used. If null bytes are +found, 'expand-file-name' will signal an error. +This means that practically all file-related operations will now check +file names for null bytes, thus avoiding subtle bugs with silently +using only the part of file name up to the first null byte. + +--- +** Frames + ++++ +*** The key prefix 'C-x 5 5' displays next command buffer in a new frame. +It's bound to the command 'other-frame-prefix' that requests the buffer +of the next command to be displayed in a new frame. + ++++ +*** New command 'clone-frame' (bound to 'C-x 5 c'). +This is like 'C-x 5 2', but uses the window configuration and frame +parameters of the current frame instead of 'default-frame-alist'. +When called interactively with a prefix arg, the window configuration +is not cloned. + +--- +*** Default values of 'frame-title-format' and 'icon-title-format' have changed. +These variables are used to display the title bar of visible frames +and the title bar of an iconified frame. They now show the name of +the current buffer and the text "GNU Emacs" instead of the value of +'invocation-name'. To get the old behavior back, add the following to +your init file: + + (setq frame-title-format '(multiple-frames "%b" + ("" invocation-name "@" system-name))) + ++++ +*** New frame parameter 'drag-with-tab-line'. +This parameter, similar to 'drag-with-header-line', allows moving frames +by dragging the tab lines of their topmost windows with the mouse. + ++++ +*** New optional behavior of 'delete-other-frames'. +When invoked with a prefix argument, 'delete-other-frames' now +iconifies frames, rather than deleting them. + +--- +*** Commands 'set-frame-width' and 'set-frame-height' now prompt for values. +These commands now prompt for the value via the minibuffer, instead of +requiring the user to specify the value via the prefix argument. + +** Windows + ++++ +*** The key prefix 'C-x 4 1' displays next command buffer in the same window. +It's bound to the command 'same-window-prefix' that requests the buffer +of the next command to be displayed in the same window. + ++++ +*** The key prefix 'C-x 4 4' displays next command buffer in a new window. +It's bound to the command 'other-window-prefix' that requests the buffer +of the next command to be displayed in a new window. + ++++ +*** New command 'recenter-other-window', bound to 'S-M-C-l'. +Like 'recenter-top-bottom', but acting on the other window. + ++++ +*** New user option 'delete-window-choose-selected'. +This allows specifying how Emacs chooses which window will be the +frame's selected window after the currently selected window is +deleted. + ++++ +*** New argument NO-OTHER for some window functions. +'get-lru-window', 'get-mru-window' and 'get-largest-window' now accept a +new optional argument NO-OTHER which, if non-nil, avoids returning a +window whose 'no-other-window' parameter is non-nil. + ++++ +*** New 'display-buffer' function 'display-buffer-use-least-recent-window'. +This is like 'display-buffer-use-some-window', but won't reuse the +current window, and when called repeatedly will try not to reuse a +previously selected window. + ++++ +*** New function 'window-bump-use-time'. +This updates the use time of a window. + +** Minibuffer + ++++ +*** Minibuffer scrolling is now conservative by default. +This is controlled by the new variable 'scroll-minibuffer-conservatively'. +It is t by default; setting it to nil will cause scrolling in the +minibuffer obey the value of 'scroll-conservatively'. + ++++ +*** Improved handling of minibuffers on switching frames. +By default, when you switch to another frame, an active minibuffer now +moves to the newly selected frame. Nevertheless, the effect of what +you type in the minibuffer happens in the frame where the minibuffer +was first activated. An alternative behavior is available by +customizing 'minibuffer-follows-selected-frame' to nil. Here, the +minibuffer stays in the frame where you first opened it, and you must +switch back to this frame to continue or abort its command. The old +behavior, which mixed these two, can be approximated by customizing +'minibuffer-follows-selected-frame' to a value which is neither nil +nor t. + ++++ +*** New user option 'read-minibuffer-restore-windows'. +When customized to nil, it uses 'minibuffer-restore-windows' in +'minibuffer-exit-hook' to remove only the window showing the +"*Completions*" buffer, but keeps all other windows created +while the minibuffer was active. + +--- +*** New variable 'redisplay-adhoc-scroll-in-resize-mini-windows'. +Customizing it to nil will disable the ad-hoc auto-scrolling of +minibuffer text shown in mini-windows when resizing those windows. +The default heuristics of that scrolling can be counter productive in +some corner cases, though the cure might be worse than the disease. +This said, the effect should be negligible in the vast majority of +cases anyway. + +** Mode Line + ++++ +*** New user option 'mode-line-compact'. +If non-nil, repeating spaces are compressed into a single space. If +'long', this is only done when the mode line is longer than the +current window width (in columns). + ++++ +*** New user options to control format of line/column numbers in the mode line. +'mode-line-position-line-format' is the line number format (when +'line-number-mode' is on), 'mode-line-position-column-format' is +the column number format (when 'column-number-mode' is on), and +'mode-line-position-column-line-format' is the combined format (when +both modes are on). + +** Tab Bars and Tab Lines + ++++ +*** The prefix key 'C-x t t' can be used to display a buffer in a new tab. +Typing 'C-x t t' before a command will cause the buffer shown by that +command to be displayed in a new tab. 'C-x t t' is bound to the +command 'other-tab-prefix'. + ++++ +*** New command 'C-x t C-r' to open file read-only in the other tab. + ++++ +*** The tab bar now supports more mouse commands. +Clicking 'mouse-2' closes the tab, 'mouse-3' displays the context menu +with items that operate on the clicked tab. Dragging the tab with +'mouse-1' moves it to another position on the tab bar. Mouse wheel +scrolling switches to the previous/next tab, and holding the Shift key +during scrolling moves the tab to the left/right. + ++++ +*** Frame-specific appearance of the tab bar when 'tab-bar-show' is a number. +When 'tab-bar-show' is a number, the tab bar on different frames can +be shown or hidden independently, as determined by the number of tabs +on each frame compared to the numerical value of 'tab-bar-show'. + ++++ +*** New command 'toggle-frame-tab-bar'. +It can be used to enable/disable the tab bar on the currently selected +frame regardless of the values of 'tab-bar-mode' and 'tab-bar-show'. +This allows enabling/disabling the tab bar independently on different +frames. + ++++ +*** New user option 'tab-bar-format' defines a list of tab bar items. +When it contains 'tab-bar-format-global' (possibly appended after +'tab-bar-format-align-right'), then after enabling 'display-time-mode' +(or any other mode that uses 'global-mode-string') it displays time +aligned to the right on the tab bar instead of on the mode line. +When 'tab-bar-format-tabs' is replaced with 'tab-bar-format-tabs-groups', +the tab bar displays tab groups. + ++++ +*** New optional key binding for 'tab-last'. +If you customize the user option 'tab-bar-select-tab-modifiers' to +allow selecting tabs using their index numbers, the '-9' key +is bound to 'tab-last', and switches to the last tab. Here +is any of the modifiers in the list that is the value of +'tab-bar-select-tab-modifiers'. You can also use positive indices, +which count from the last tab: 1 is the last tab, 2 the one before +that, etc. + +--- +*** New command 'tab-duplicate' bound to 'C-x t n'. + +--- +*** 'C-x t N' creates a new tab at the specified absolute position. +The position is provided as prefix arg, and specifies an index that +starts at 1. Negative values count from the end of the tab bar. + +--- +*** 'C-x t M' moves the current tab to the specified absolute position. +The position is provided as prefix arg, whose interpretation is as in +'C-x t N'. + +--- +*** 'C-x t G' assigns a tab to a named group of tabs. +'tab-close-group' closes all tabs that belong to the selected group. +The user option 'tab-bar-new-tab-group' defines the default group of +new tabs. After customizing 'tab-bar-tab-post-change-group-functions' +to 'tab-bar-move-tab-to-group', changing the group of a tab will also +move it closer to other tabs in the same group. + +--- +*** New user option 'tab-bar-tab-name-format-function'. + +--- +*** New user option 'tab-line-tab-name-format-function'. + +--- +*** The tabs in the tab line can now be scrolled using horizontal scroll. +If your mouse or trackpad supports it, you can now scroll tabs when +the mouse pointer is in the tab line by scrolling left or right. + +--- +*** New tab-line faces and user options. +The face 'tab-line-tab-special' is used for tabs whose buffers are +special, i.e. buffers that don't visit a file. The face +'tab-line-tab-modified' is used to display modified, file-backed +buffers. The face 'tab-line-tab-inactive-alternate' is used to +display inactive tabs with an alternating background color, making +them easier to distinguish, especially if the face 'tab-line-tab' is +configured to not display with a box; this alternate face is only +applied when the user option 'tab-line-tab-face-functions' is so +configured. That option may also be used to customize tab-line faces +in other ways. + +** Mouse wheel + +--- +*** Mouse wheel scrolling now defaults to one line at a time. + +--- +*** Mouse wheel scrolling now works on more parts of frame's display. +When using 'mouse-wheel-mode', the mouse wheel will now scroll also when +the mouse cursor is on the scroll bars, fringes, margins, header line, +and mode line. ('mouse-wheel-mode' is enabled by default on most graphical +displays.) + ++++ +*** Mouse wheel scrolling with Shift modifier now scrolls horizontally. +This works in text buffers and over images. Typing a numeric prefix arg +(e.g. 'M-5') before starting horizontal scrolling changes its step value. +The value is saved in the user option 'mouse-wheel-scroll-amount-horizontal'. + +** Customize + +--- +*** Customize buffers can now be reverted with 'C-x x g'. + +--- +*** Most customize commands now hide obsolete user options. +Obsolete user options are no longer shown in the listings produced by +the commands 'customize', 'customize-group', 'customize-apropos' and +'customize-changed'. + +To customize obsolete user options, use 'customize-option' or +'customize-saved'. + +--- +*** New SVG icons for checkboxes and arrows. +They will be used automatically instead of the old icons. If Emacs is +built without SVG support, the old icons will be used instead. + +** Help + +--- +*** The order of things displayed in the "*Help*" buffer has been changed. +The indented "administrative" block (containing the "probably +introduced" and "other relevant functions" (and similar things) has +been moved to after the doc string. + ++++ +*** New command 'describe-command' shows help for a command. +This can be used instead of 'describe-function' for interactive +commands and is globally bound to 'C-h x'. + ++++ +*** New command 'describe-keymap' describes keybindings in a keymap. + +--- +*** New command 'apropos-function'. +This works like 'C-u M-x apropos-command' but is more discoverable. + +--- +*** New keybinding 'C-h R' prompts for an Info manual and displays it. + +--- +*** Keybindings in 'help-mode' use the new 'help-key-binding' face. +This face is added by 'substitute-command-keys' to any "\[command]" +substitution. The return value of that function should consequently +be assumed to be a propertized string. + +Note that the new face will also be used in tooltips. When using the +GTK toolkit, this is only true if 'x-gtk-use-system-tooltips' is t. + ++++ +*** New user option 'help-enable-symbol-autoload'. +If non-nil, displaying help for an autoloaded function whose +'autoload' form provides no documentation string will try to load the +file it's from. This will give more extensive help for such +functions. + +--- +*** The 'help-for-help' ('C-h C-h') screen has been redesigned. + ++++ +*** New convenience commands with short keys in the Help buffer. +New command 'help-view-source' ('s') will view the source file (if +any) of the current help topic. New command 'help-goto-info' ('i') +will look up the current symbol (if any) in Info. New command +'help-customize' ('c') will customize the user option or the face +(if any) whose doc string is being shown in the Help buffer. + +--- +*** New user option 'describe-bindings-outline'. +It enables outlines in the output buffer of 'describe-bindings' that +can provide a better overview in a long list of available bindings. + ++++ +*** New commands to describe buttons and widgets. +'widget-describe' (on a widget) will pop up a help buffer and give a +description of the properties. Likewise 'button-describe' does the +same for a button. + +--- +*** Improved "find definition" feature of "*Help*" buffers. +Now clicking on the link to find the definition of functions generated +by 'cl-defstruct', or variables generated by 'define-derived-mode', +for example, will go to the exact place where they are defined. + +--- +*** New commands 'apropos-next-symbol' and 'apropos-previous-symbol'. +These new navigation commands are bound to 'n' and 'p' in +'apropos-mode'. + +--- +*** The command 'view-lossage' can now be invoked from the menu bar. +The menu bar "Help" menu now has a "Show Recent Inputs" item under the +"Describe" sub-menu. + ++++ +*** New command 'lossage-size'. +It allows users to change the maximum number of keystrokes and +commands recorded for the purpose of 'view-lossage'. + +--- +*** Closing the "*Help*" buffer from the toolbar now buries the buffer. +In previous Emacs versions, the "*Help*" buffer was killed instead when +clicking the "X" icon in the tool bar. + +--- +*** 'g' ('revert-buffer') in 'help-mode' no longer requires confirmation. + +** File Locks + ++++ +*** New user option 'lock-file-name-transforms'. +This option allows controlling where lock files are written. It uses +the same syntax as 'auto-save-file-name-transforms'. + ++++ +*** New user option 'remote-file-name-inhibit-locks'. +When non-nil, this option suppresses lock files for remote files. +Default is nil. + ++++ +*** New minor mode 'lock-file-mode'. +This command, called interactively, toggles the local value of +'create-lockfiles' in the current buffer. + +** Emacs Server + ++++ +*** New user option 'server-client-instructions'. +When emacsclient connects, Emacs will (by default) output a message +about how to exit the client frame. If 'server-client-instructions' +is set to nil, this message is inhibited. + ++++ +*** New command 'server-edit-abort'. +This command (not bound to any key by default) can be used to abort +an edit instead of marking it as "Done" (which the 'C-x #' command +does). The 'emacsclient' program exits with an abnormal status as +result of this command. + ++++ +*** New desktop integration for connecting to the server. +If your operating system’s desktop environment is +freedesktop.org-compatible (which is true of most GNU/Linux and other +recent Unix-like desktops), you may use the new "Emacs (Client)" +desktop menu entry to open files in an existing Emacs instance rather +than starting a new one. The daemon starts if it is not already +running. + +** Miscellaneous + ++++ +*** New command 'font-lock-update', bound to 'C-x x f'. +This command updates the syntax highlighting in this buffer. + ++++ +*** New command 'memory-report'. +This command opens a new buffer called "*Memory Report*" and gives a +summary of where Emacs is using memory currently. + ++++ +*** New command 'submit-emacs-patch'. +This works like 'report-emacs-bug', but is more geared towards sending +patches to the Emacs issue tracker. + +--- +*** New face 'apropos-button'. +Applies to buttons that indicate a face. + ++++ +*** New face 'font-lock-doc-markup-face'. +Intended for documentation mark-up syntax and tags inside text that +uses 'font-lock-doc-face', which it should appropriately stand out +against and harmonize with. It would typically be used in structured +documentation comments in program source code by language-specific +modes, for mark-up conventions like Haddock, Javadoc or Doxygen. By +default this face inherits from 'font-lock-constant-face'. + ++++ +*** New face box style 'flat-button'. +This is a plain 2D button, but uses the background color instead of +the foreground color. + +--- +*** New faces 'shortdoc-heading' and 'shortdoc-section'. +Applied to shortdoc headings and sections. + +--- +*** New face 'separator-line'. +This is used by 'make-separator-line' (see below). + ++++ +*** 'redisplay-skip-fontification-on-input' helps Emacs keep up with fast input. +This is another attempt to solve the problem of handling high key repeat rate +and other "slow scrolling" situations. It is hoped it behaves better +than 'fast-but-imprecise-scrolling' and 'jit-lock-defer-time'. +It is not enabled by default. + +--- +*** Obsolete aliases are no longer hidden from command completion. +Completion of command names now considers obsolete aliases as +candidates, if they were marked obsolete in the current major version +of Emacs. Invoking a command via an obsolete alias now mentions the +obsolescence fact and shows the new name of the command. + ++++ +*** Support for '(box . SIZE)' 'cursor-type'. +By default, 'box' cursor always has a filled box shape. But if you +specify 'cursor-type' to be '(box . SIZE)', the cursor becomes a hollow +box if the point is on an image larger than SIZE pixels in any +dimension. + ++++ +*** The user can now customize how "default" values are prompted for. +The new utility function 'format-prompt' has been added which uses the +new 'minibuffer-default-prompt-format' user option to format "default" +prompts. This means that prompts that look like "Enter a number +(default 10)" can be customized to look like, for instance, "Enter a +number [10]", or not have the default displayed at all, like "Enter a +number". (This only affects callers that were altered to use +'format-prompt'.) + +--- +*** New help window when Emacs prompts before opening a large file. +Commands like 'find-file' or 'visit-tags-table' ask to visit a file +normally or literally when the file is larger than a certain size (by +default, 9.5 MiB). Press '?' or 'C-h' in that prompt to read more +about the different options to visit a file, how you can disable the +prompt, and how you can tweak the file size threshold. + ++++ +*** Emacs now defaults to UTF-8 instead of ISO-8859-1. +This is only for the default, where the user has set no 'LANG' (or +similar) variable or environment. This change should lead to no +user-visible changes for normal usage. + +--- +*** 'global-display-fill-column-indicator-mode' skips some buffers. +By default, turning on 'global-display-fill-column-indicator-mode' +doesn't turn on 'display-fill-column-indicator-mode' in special-mode +buffers. This can be controlled by customizing the user option +'global-display-fill-column-indicator-modes'. + ++++ +*** 'nobreak-char-display' now also affects all non-ASCII space characters. +Previously, this was limited only to 'NO-BREAK SPACE' and hyphen +characters. Now it also covers the rest of the non-ASCII Unicode +space characters. Also, unlike in previous versions of Emacs, the +non-ASCII characters are displayed as themselves when +'nobreak-char-display' is t, i.e. they are not replaced on display +with the ASCII space and hyphen characters. + +--- +*** New backward compatibility variable 'nobreak-char-ascii-display'. +This variable is nil by default, and non-ASCII space and hyphen +characters are displayed as themselves, even if 'nobreak-char-display' +is non-nil. If 'nobreak-char-ascii-display' is set to a non-nil +value, the non-ASCII space and hyphen characters are instead displayed +as their ASCII counterparts: spaces and ASCII hyphen (a.k.a. "dash") +characters. This provides backward compatibility feature for the +change described above, where the non-ASCII characters are no longer +replaced with their ASCII counterparts when 'nobreak-char-display' is +t. You may need this on text-mode terminals that produce messed up +display when non-ASCII spaces and hyphens are written to the display. +(This variable is only effective when 'nobreak-char-display' is t.) + ++++ +*** Improved support for terminal emulators that encode the Meta flag. +Some terminal emulators set the 8th bit of Meta characters, and then +encode the resulting character code as if it were non-ASCII character +above codepoint 127. Previously, the only way of using these in Emacs +was to set up the terminal emulator to use the 'ESC' characters to send +Meta characters to Emacs, e.g., send "ESC x" when the user types +'M-x'. You can now avoid the need for this setup of such terminal +emulators by using the new input-meta-mode with the special value +'encoded' with these terminal emulators. + +--- +*** 'auto-composition-mode' can now be selectively disabled on some TTYs. +Some text-mode terminals produce display glitches trying to compose +characters. The 'auto-composition-mode' can now have a string value +that names a terminal type; if the value returned by the 'tty-type' +function compares equal with that string, automatic composition will +be disabled in windows shown on that terminal. The Linux terminal +sets this up by default. + +--- +*** Support for the 'strike-through' face attribute on TTY frames. +If your terminal's termcap or terminfo database entry has the 'smxx' +capability defined, Emacs will now emit the prescribed escape +sequences necessary to render faces with the 'strike-through' +attribute on TTY frames. + +--- +*** TTY menu navigation is now supported in 'xterm-mouse-mode'. +TTY menus support mouse navigation and selection when 'xterm-mouse-mode' +is active. When run on a terminal, clicking on the menu bar with the +mouse now pops up a TTY menu by default instead of running the command +'tmm-menubar'. To restore the old behavior, set the user option +'tty-menu-open-use-tmm' to non-nil. + +--- +*** 'M-x report-emacs-bug' will no longer include "Recent messages" section. +These were taken from the "*Messages*" buffer, and may inadvertently +leak information from the reporting user. + +--- +*** 'C-u M-x dig' will now prompt for a query type to use. + +--- +*** Rudimentary support for the 'st' terminal emulator. +Emacs now supports 256 color display on the 'st' terminal emulator. + ++++ +*** Update IRC-related references to point to Libera.Chat. +The Free Software Foundation and the GNU Project have moved their +official IRC channels from the Freenode network to Libera.Chat. For the +original announcement and the follow-up update, including more details, +see: + +https://lists.gnu.org/archive/html/info-gnu/2021-06/msg00005.html +https://lists.gnu.org/archive/html/info-gnu/2021-06/msg00007.html + +Given the relocation of GNU and FSF's official IRC channels, as well +as #emacs and various other Emacs-themed channels (see the link below) +to Libera.Chat, IRC-related references in the Emacs repository have +now been updated to point to Libera.Chat. + +https://lists.gnu.org/archive/html/info-gnu-emacs/2021-06/msg00000.html + + +* Incompatible Editing Changes in Emacs 28.1 + +--- +** 'toggle-truncate-lines' now disables 'visual-line-mode'. +This is for symmetry with 'visual-line-mode', which disables +'truncate-lines'. + +--- +** 'electric-indent-mode' now also indents inside strings and comments. +(This only happens when indentation function also supports this.) + +To recover the previous behavior you can use: + + (add-hook 'electric-indent-functions + (lambda (_) (if (nth 8 (syntax-ppss)) 'no-indent))) + +--- +** The 'M-o' ('facemenu-keymap') global binding has been removed. +To restore the old binding, say something like: + + (require 'facemenu) + (define-key global-map "\M-o" 'facemenu-keymap) + (define-key facemenu-keymap "\es" 'center-line) + (define-key facemenu-keymap "\eS" 'center-paragraph) + +The last two lines are not strictly necessary if you don't care about +having those two commands on the 'M-o' keymap; see the next section. + +--- +** The 'M-o M-s' and 'M-o M-S' global bindings have been removed. +Use 'M-x center-line' and 'M-x center-paragraph' instead. See the +previous section for how to get back the old bindings. Alternatively, +if you only want these two commands to have the global bindings they +had before, you can add the following to your init file: + + (define-key global-map "\M-o\M-s" 'center-line) + (define-key global-map "\M-o\M-S" 'center-paragraph) + +--- +** The 'M-o M-o' global binding has been removed. +Use 'M-x font-lock-fontify-block' instead, or the new 'C-x x f' +command, which updates the syntax highlighting in the current buffer. + +--- +** The escape sequence '\e[29~' in Xterm is now mapped to 'menu'. +Xterm sends this sequence for both 'F16' and 'Menu' keys +It used to be mapped to 'print' but we couldn't find a terminal +that uses this sequence for any kind of 'Print' key. +This makes the Menu key (see https://en.wikipedia.org/wiki/Menu_key) +work for 'context-menu-mode' in Xterm. + +--- +** New user option 'xterm-store-paste-on-kill-ring'. +If non-nil (the default), Emacs pushes pasted text onto the kill ring +(if using an xterm-like terminal that supports bracketed paste). +Setting this to nil inhibits that. + +--- +** 'vc-print-branch-log' shows the change log from its root directory. +It previously used to use the default directory. + +--- +** 'project-shell' and 'shell' now use 'pop-to-buffer-same-window'. +This is to keep the same behavior as Eshell. + +--- +** In 'nroff-mode', 'center-line' is no longer bound to a key. +The original key binding was 'M-s', which interfered with I-search, +since the latter uses 'M-s' as a prefix key of the search prefix map. + +--- +** In 'f90-mode', the backslash character ('\') no longer escapes. +For about a decade, the backslash character has no longer had a +special escape syntax in Fortran F90. To get the old behavior back, +say something like: + + (modify-syntax-entry ?\\ "\\" f90-mode-syntax-table) + ++++ +** Setting 'fill-column' to nil is obsolete. +This undocumented use of 'fill-column' is now obsolete. To disable +auto filling, turn off 'auto-fill-mode' instead. + +For instance, you could add something like the following to your init +file: + + (add-hook 'foo-mode-hook (lambda () (auto-fill-mode -1)) + +** Xref migrated from EIEIO to cl-defstruct for its core objects. +This means that 'oref' and 'with-slots' no longer works on them, and +'make-instance' can no longer be used to create those instances (which +wasn't recommended anyway). Packages should restrict themselves to +using functions like 'xref-make', 'xref-make-match', +'xref-make-*-location', as well as accessor functions +'xref-item-summary' and 'xref-item-location'. + +Among the benefits are better performance (noticeable when there are a +lot of matches) and improved flexibility: 'xref-match-item' instances +do not require that 'location' inherits from 'xref-location' anymore +(that class was removed), so packages can create new location types to +use with "match items" without adding EIEIO as a dependency. + + +* Editing Changes in Emacs 28.1 + +** Input methods + ++++ +*** Emacs now supports "transient" input methods. +A transient input method is enabled for inserting a single character, +and is then automatically disabled. 'C-x \' temporarily enables the +selected transient input method. Use 'C-u C-x \' to select a +transient input method (which can be different from the input method +enabled by 'C-\'). For example, 'C-u C-x \ compose RET' selects the +'compose' input method; then typing 'C-x \ 1 2' will insert the +character '½', and disable the 'compose' input method afterwards. +You can use 'C-x \' in incremental search to insert a single character +to the search string. + +--- +*** New input method 'compose' based on X Multi_key sequences. + +--- +*** New input method 'iso-transl' with the same keys as 'C-x 8'. +After selecting it as a transient input method with 'C-u C-x \ +iso-transl RET', it supports the same key sequences as 'C-x 8', +so e.g. like 'C-x 8 [' inserts a left single quotation mark, +'C-x \ [' does the same. + +--- +*** New user option 'read-char-by-name-sort'. +It defines the sorting order of characters for completion of 'C-x 8 RET TAB' +and can be customized to sort them by codepoints instead of character names. +Additionally, you can group characters by Unicode blocks after customizing +'completions-group' and 'completions-group-sort'. + +--- +*** Improved language transliteration in Malayalam input methods. +Added a new Mozhi scheme. The inapplicable ITRANS scheme is now +deprecated. Errors in the Inscript method were corrected. + +--- +*** New input method 'cham'. +There's also a Cham greeting in "etc/HELLO". + +--- +*** New input methods for Lakota language orthographies. +Two orthographies are represented here, the Suggested Lakota +Orthography and what is known as the White Hat Orthography. Input +methods 'lakota-slo-prefix', 'lakota-slo-postfix', and +'lakota-white-hat-postfix' have been added. There is also a Lakota +greeting in "etc/HELLO". + ++++ +** Standalone 'M-y' allows interactive selection from previous kills. +'M-y' can now be typed after a command that is not a yank command. +When invoked like that, it prompts in the minibuffer for one of the +previous kills, offering completion and minibuffer-history navigation +through previous kills recorded in the kill ring. A similar feature +in Isearch can be invoked if you bind 'C-s M-y' to the command +'isearch-yank-pop'. When the user option 'yank-from-kill-ring-rotate' +is nil the kill ring is not rotated after 'yank-from-kill-ring'. + ++++ +** New user option 'word-wrap-by-category'. +When word-wrap is enabled, and this option is non-nil, that allows +Emacs to break lines after more characters than just whitespace +characters. In particular, this significantly improves word-wrapping +for CJK text mixed with Latin text. + ++++ +** New command 'undo-redo'. +It undoes previous undo commands, but doesn't record itself as an +undoable command. It is bound to 'C-?' and 'C-M-_', the first binding +works well in graphical mode, and the second one is easy to hit on tty. + +For full conventional undo/redo behavior, you can also customize the +user option 'undo-no-redo' to t. + ++++ +** New commands 'copy-matching-lines' and 'kill-matching-lines'. +These commands are similar to the command 'flush-lines', +but add the matching lines to the kill ring as a single string, +including the newlines that separate the lines. + ++++ +** New user option 'kill-transform-function'. +This can be used to transform (and suppress) strings from entering the +kill ring. + ++++ +** 'save-interprogram-paste-before-kill' can now be a number. +In that case, it's interpreted as a limit on the size of the clipboard +data that will be saved to the 'kill-ring' prior to killing text: if +the size of the clipboard data is greater than or equal to the limit, +it will not be saved. + ++++ +** New user option 'tab-first-completion'. +If 'tab-always-indent' is 'complete', this new user option can be used to +further tweak whether to complete or indent. + +--- +** 'indent-tabs-mode' is now a global minor mode instead of just a variable. + ++++ +** New choice 'permanent' for 'shift-select-mode'. +When the mark was activated by shifted motion keys, non-shifted motion +keys don't deactivate the mark after customizing 'shift-select-mode' +to 'permanent'. Similarly, the active mark will not be deactivated by +typing shifted motion keys. + ++++ +** The "Edit => Clear" menu item now obeys a rectangular region. + ++++ +** New command 'revert-buffer-with-fine-grain'. +Revert a buffer trying to be as non-destructive as possible, +preserving markers, properties and overlays. The new variable +'revert-buffer-with-fine-grain-max-seconds' specifies the maximum +number of seconds that 'revert-buffer-with-fine-grain' should spend +trying to be non-destructive, with a default value of 2 seconds. + ++++ +** New command 'revert-buffer-quick'. +This is bound to 'C-x x g' and is like 'revert-buffer', but prompts +less. + ++++ +** New user option 'revert-buffer-quick-short-answers'. +This controls how the new 'revert-buffer-quick' ('C-x x g') command +prompts. A non-nil value will make it use 'y-or-n-p' rather than +'yes-or-no-p'. Defaults to nil. + ++++ +** New user option 'query-about-changed-file'. +If non-nil (the default), Emacs prompts as before when re-visiting a +file that has changed externally after it was visited the first time. +If nil, Emacs does not prompt, but instead shows the buffer with its +contents before the change, and provides instructions how to revert +the buffer. + +--- +** New value 'save-some-buffers-root' of 'save-some-buffers-default-predicate'. +When using this predicate, only buffers under the current project root +will be considered when saving buffers with 'save-some-buffers'. + +--- +** New user option 'save-place-abbreviate-file-names'. +This can simplify sharing the 'save-place-file' file across +different hosts. + +--- +** New user options 'copy-region-blink-delay' and 'delete-pair-blink-delay'. +'copy-region-blink-delay' specifies a delay to indicate the region +copied by 'kill-ring-save'. 'delete-pair-blink-delay' specifies +a delay to show the paired character to delete. + +--- +** 'zap-up-to-char' now uses 'read-char-from-minibuffer'. +This allows navigating through the history of characters that have +been input. This is mostly useful for characters that have complex +input methods where inputting the character again may involve many +keystrokes. + ++++ +** Input history for 'goto-line' can now be made local to every buffer. +In any event, line numbers used with 'goto-line' are kept in their own +history list. This should help make faster the process of finding +line numbers that were previously jumped to. By default, all buffers +share a single history list. To make every buffer have its own +history list, customize the user option 'goto-line-history-local'. + ++++ +** New command 'goto-line-relative' for use in a narrowed buffer. +It moves point to the line relative to the accessible portion of the +narrowed buffer. 'M-g M-g' in Info is rebound to this command. +When 'widen-automatically' is non-nil, 'goto-line' widens the narrowed +buffer to be able to move point to the inaccessible portion. +'goto-line-relative' is bound to 'C-x n g'. + ++++ +** 'goto-char' prompts for the character position. +When called interactively, 'goto-char' now offers the position at +point as the default. + +** Auto-saving via 'auto-save-visited-mode' can now be inhibited. +Set the variable 'auto-save-visited-mode' buffer-locally to nil to +achieve that. + ++++ +** New command 'kdb-macro-redisplay' to force redisplay in keyboard macros. +This command is bound to 'C-x C-k d'. + +--- +** 'blink-cursor-mode' is now enabled by default regardless of the UI. +It used to be enabled when Emacs is started in GUI mode but not when started +in text mode. The cursor still only actually blinks in GUI frames. + +** 'show-paren-mode' is now enabled by default. +To go back to the previous behavior, customize the user option of the +same name to nil. + ++++ +** New minor mode 'show-paren-local-mode'. +It serves as a local counterpart for 'show-paren-mode', allowing you +to toggle it separately in different buffers. To use it only in +programming modes, for example, add the following to your init file: + + (add-hook 'prog-mode-hook #'show-paren-local-mode) + + +* Changes in Specialized Modes and Packages in Emacs 28.1 + +** Isearch and Replace + ++++ +*** Interactive regular expression search now uses faces for sub-groups. +E.g., 'C-M-s foo-\([0-9]+\)' will now use the 'isearch-group-1' face +on the part of the regexp that matches the sub-expression "[0-9]+". +By default, there are two faces for sub-group highlighting, but you +can define more faces whose names are of the form 'isearch-group-N', +where N are successive numbers above 2. + +This is controlled by the 'search-highlight-submatches' user option. +This feature is available only on terminals that have enough colors to +distinguish between sub-expression highlighting. + ++++ +*** Interactive regular expression replace now uses faces for sub-groups. +Like 'search-highlight-submatches', this is controlled by the new user option +'query-replace-highlight-submatches'. + ++++ +*** New key 'M-s M-.' starts isearch looking for the thing at point. +This key is bound to the new command 'isearch-forward-thing-at-point'. +The new user option 'isearch-forward-thing-at-point' defines +a list of symbols to try to get the "thing" at point. By default, +the first element of the list is 'region' that tries to yank +the currently active region to the search string. + ++++ +*** New user option 'isearch-wrap-pause' defines how to wrap the search. +There are choices to disable wrapping completely and to wrap immediately. +When wrapping immediately, it consistently handles the numeric arguments +of 'C-s' ('isearch-repeat-forward') and 'C-r' ('isearch-repeat-backward'), +continuing with the remaining count after wrapping. + ++++ +*** New user option 'isearch-repeat-on-direction-change'. +When this option is set, direction changes in Isearch move to another +search match, if there is one, instead of moving point to the other +end of the current match. + ++++ +*** New user option 'isearch-allow-motion'. +When 'isearch-allow-motion' is set, the commands 'beginning-of-buffer', +'end-of-buffer', 'scroll-up-command' and 'scroll-down-command', when +invoked during I-search, move respectively to the first occurrence of +the current search string in the buffer, the last one, the first one +after the current window, and the last one before the current window. +Additionally, users can change the meaning of other motion commands +during I-search by using their 'isearch-motion' property. The user +option 'isearch-motion-changes-direction' controls whether the +direction of the search changes after a motion command. + ++++ +*** New user option 'lazy-highlight-no-delay-length'. +Lazy highlighting of matches in Isearch now starts immediately if the +search string is at least this long. 'lazy-highlight-initial-delay' +still applies for shorter search strings, which avoids flicker in the +search buffer due to too many matches being highlighted. + ++++ +*** The default 'search-whitespace-regexp' value has changed. +This used to be "\\s-+", which meant that it was mode-dependent whether +newlines were included in the whitespace set. This has now been +changed to only match spaces and tab characters. + +** Dired + ++++ +*** New user option 'dired-kill-when-opening-new-dired-buffer'. +If non-nil, Dired will kill the current buffer when selecting a new +directory to display. + ++++ +*** Behavior change on 'dired-do-chmod'. +As a security precaution, Dired's M command no longer follows symbolic +links. Instead, it changes the symbolic link's own mode; this always +fails on platforms where such modes are immutable. + +--- +*** Behavior change on 'dired-clean-confirm-killing-deleted-buffers'. +Previously, if 'dired-clean-up-buffers-too' was non-nil, and +'dired-clean-confirm-killing-deleted-buffers' was nil, the buffers +wouldn't be killed. This combination will now kill the buffers. + ++++ +*** New user option 'dired-switches-in-mode-line'. +This user option controls how 'ls' switches are displayed in the mode +line, and allows truncating them (to preserve space on the mode line) +or showing them literally, either instead of, or in addition to, +displaying "by name" or "by date" sort order. + ++++ +*** New user option 'dired-compress-directory-default-suffix'. +This user option controls the default suffix for compressing a +directory. If it's nil, ".tar.gz" will be used. Refer to +'dired-compress-files-alist' for a list of supported suffixes. + ++++ +*** New user option 'dired-compress-file-default-suffix'. +This user option controls the default suffix for compressing files. +If it's nil, ".gz" will be used. Refer to 'dired-compress-file-alist' +for a list of supported suffixes. + +--- +*** Broken and circular links are shown with the 'dired-broken-symlink' face. + +--- +*** '=' ('dired-diff') will now put all backup files into the 'M-n' history. +When using '=' on a file with backup files, the default file to use +for diffing is the newest backup file. You can now use 'M-n' to quickly +select a different backup file instead. + ++++ +*** New user option 'dired-maybe-use-globstar'. +If set, enables globstar (recursive globbing) in shells that support +this feature, but have it turned off by default. This allows producing +directory listings with files matching a wildcard in all the +subdirectories of a given directory. The new variable +'dired-enable-globstar-in-shell' lists which shells can have globstar +enabled, and how to enable it. + ++++ +*** New user option 'dired-copy-dereference'. +If set to non-nil, Dired will dereference symbolic links when copying. +This can be switched off on a per-usage basis by providing +'dired-do-copy' with a 'C-u' prefix. + +--- +*** New user option 'dired-do-revert-buffer'. +Non-nil reverts the destination Dired buffer after performing one +of these operations: 'dired-do-copy', 'dired-do-rename', +'dired-do-symlink', 'dired-do-hardlink'. + +--- +*** New user option 'dired-mark-region'. +This option affects all Dired commands that mark files. When non-nil +and the region is active in Transient Mark mode, then Dired commands +operate only on files in the active region. The values 'file' and +'line' of this user option define the details of marking the file at +the end of the region. + ++++ +*** State changing VC operations are supported in Dired. +These operations are supported on files and directories via the new +command 'dired-vc-next-action'. + ++++ +*** 'dired-jump' and 'dired-jump-other-window' moved from 'dired-x' to 'dired'. +The 'dired-jump' and 'dired-jump-other-window' commands have been +moved from the 'dired-x' package to 'dired'. The user option +'dired-bind-jump' no longer has any effect and is now obsolete. +The commands are now bound to 'C-x C-j' and 'C-x 4 C-j' by default. + +To get the old behavior of 'dired-bind-jump' back and unbind the above +keys, add the following to your init file: + + (global-set-key "\C-x\C-j" nil) + (global-set-key "\C-x4\C-j" nil) + +--- +*** 'dired-query' now uses 'read-char-from-minibuffer'. +Using it instead of 'read-char-choice' allows using 'C-x o' +to switch to the help window displayed after typing 'C-h'. + - ++++ +** Emacs 28.1 comes with Org v9.5. +See the file ORG-NEWS for user-visible changes in Org. + +** Outline + ++++ +*** New commands to cycle heading visibility. +Typing 'TAB' on a heading line cycles the current section between +"hide all", "subheadings", and "show all" states. Typing 'S-TAB' +anywhere in the buffer cycles the whole buffer between "only top-level +headings", "all headings and subheadings", and "show all" states. + ++++ +*** New user option 'outline-minor-mode-cycle'. +This user option customizes 'outline-minor-mode', with the difference +that 'TAB' and 'S-TAB' on heading lines cycle heading visibility. +Typing 'TAB' on a heading line cycles the current section between +"hide all", "subheadings", and "show all" states. Typing 'S-TAB' on a +heading line cycles the whole buffer between "only top-level +headings", "all headings and subheadings", and "show all" states. + +--- +*** New user option 'outline-minor-mode-highlight'. +This user option customizes 'outline-minor-mode'. It puts +highlighting on heading lines using standard outline faces. This +works well only when there are no conflicts with faces used by the +major mode. + +** Ispell + ++++ +*** 'ispell-comments-and-strings' now accepts START and END arguments. +These arguments default to the active region when used interactively. + ++++ +*** New command 'ispell-comment-or-string-at-point'. + +--- +*** New user option 'ispell-help-timeout'. +This controls how long the ispell help (on the '?' key) is displayed. + +** Flyspell mode + ++++ +*** Corrections and actions menu can be optionally bound to 'mouse-3'. +When Flyspell mode highlights a word as misspelled, you can click on +it to display a menu of possible corrections and actions. You can now +easily bind this menu to 'down-mouse-3' (usually the right mouse button) +instead of 'mouse-2' (the default) by enabling 'context-menu-mode'. + +--- +*** The current dictionary is now displayed in the minor mode lighter. +Clicking the dictionary name changes the current dictionary. + +** Package + +*** The new NonGNU ELPA archive is enabled by default alongside GNU ELPA. +Thus, packages on NonGNU ELPA will appear by default in the list shown +by 'list-packages'. + +--- +*** '/ s' ('package-menu-filter-by-status') changed parameter handling. +The command was documented to take a comma-separated list of statuses +to filter by, but instead it used the parameter as a regexp. The +command has been changed so that it now works as documented, and +checks statuses not as a regexp, but instead an exact match from the +comma-separated list. + ++++ +*** New command 'package-browse-url' and keystroke 'w'. + ++++ +*** New commands to filter the package list. +The filter commands are bound to the following keys: + +key binding +--- ------- +/ a package-menu-filter-by-archive +/ d package-menu-filter-by-description +/ k package-menu-filter-by-keyword +/ N package-menu-filter-by-name-or-description +/ n package-menu-filter-by-name +/ s package-menu-filter-by-status +/ v package-menu-filter-by-version +/ m package-menu-filter-marked +/ u package-menu-filter-upgradable +/ / package-menu-filter-clear + +*** Option to automatically native-compile packages upon installation. +Customize the user option 'package-native-compile' to enable automatic +native compilation of packages when they are installed. That option +is nil by default; if set non-nil, and if your Emacs was built with +native-compilation support, each package will be natively compiled +when it is installed, by invoking an asynchronous Emacs subprocess to +run the native-compilation of the package files. (Be sure to leave +Emacs running until these asynchronous subprocesses exit, or else the +native-compilation will be aborted when you exit Emacs.) + +--- +*** Column widths in 'list-packages' display can now be customized. +See the new user options 'package-name-column-width', +'package-version-column-width', 'package-status-column-width', and +'package-archive-column-width'. + +** Info + +--- +*** New user option 'Info-warn-on-index-alternatives-wrap'. +This option affects what happens when using the ',' command after +looking up an entry with 'i' in info buffers. If non-nil (the +default), the ',' command will now display a warning when proceeding +beyond the final index match, and tapping ',' once more will then take +you to the first match. + +** Abbrev mode + ++++ +*** Emacs can now suggest to use an abbrev based on text you type. +A new user option, 'abbrev-suggest', enables the new abbrev suggestion +feature. When enabled, if a user manually types a piece of text that +could have saved enough typing by using an abbrev, a hint will be +displayed in the echo area, mentioning the abbrev that could have been +used instead. + +** Bookmarks + +--- +*** Bookmarks can now be targets for new tabs. +When the bookmark.el library is loaded, a customize choice is added +to 'tab-bar-new-tab-choice' for new tabs to show the bookmark list. + - --- - *** The 'list-bookmarks' menu is now based on 'tabulated-list-mode'. - The interactive bookmark list will now benefit from features in - 'tabulated-list-mode' like sorting columns or changing column width. - - Support for the optional "inline" header line, allowing for a header - without using 'header-line-format', has been dropped. Consequently, - the variables 'bookmark-bmenu-use-header-line' and - 'bookmark-bmenu-inline-header-height' are now declared obsolete. - +--- +*** New user option 'bookmark-set-fringe-mark'. +If non-nil, setting a bookmark will set a fringe mark on the current +line, and jumping to a bookmark will also set this mark. + +--- +*** New user option 'bookmark-menu-confirm-deletion'. +In Bookmark Menu mode, Emacs by default does not prompt for +confirmation when you type 'x' to execute the deletion of bookmarks +that have been marked for deletion. However, if this new option is +non-nil then Emacs will require confirmation with 'yes-or-no-p' before +deleting. + ++--- ++*** The 'list-bookmarks' menu is now based on 'tabulated-list-mode'. ++The interactive bookmark list will now benefit from features in ++'tabulated-list-mode' like sorting columns or changing column width. ++ ++Support for the optional "inline" header line, allowing for a ++header without using 'header-line-format', has been dropped. ++The variables 'bookmark-bmenu-use-header-line' and ++'bookmark-bmenu-inline-header-height' are now obsolete. ++ +** Recentf + +--- +*** The recentf files are no longer backed up. + +--- +*** 'recentf-auto-cleanup' now repeats daily when set to a time string. +When 'recentf-auto-cleanup' is set to a time string, it now repeats +every day, rather than only running once after the mode is turned on. + +** Calc + +--- +*** The behavior when doing forward-delete has been changed. +Previously, using the 'C-d' command would delete the final number in +the input field, no matter where point was. This has been changed to +work more traditionally, with 'C-d' deleting the next character. +Likewise, point isn't moved to the end of the string before inserting +digits. + ++++ +*** Setting the word size to zero disables word clipping. +The word size normally clips the results of certain bit-oriented +operations such as shifts and bitwise XOR. A word size of zero, set +by 'b w', makes the operation have effect on the whole argument values +and the result is not truncated in any way. + +--- +*** The '/' operator now has higher precedence in (La)TeX input mode. +It no longer has lower precedence than '+' and '-'. + +--- +*** Calc now marks its windows dedicated. +The new user option 'calc-make-windows-dedicated' controls this. It +is t by default; set to nil to get back the old behavior. + +** Calendar + ++++ +*** New user option 'calendar-time-zone-style'. +If 'numeric', calendar functions (eg 'calendar-sunrise-sunset') that display +time zones will use a form like "+0100" instead of "CET". + +** Imenu + ++++ +*** New user option 'imenu-max-index-time'. +If creating the imenu index takes longer than specified by this +option (default 5 seconds), imenu indexing is stopped. + +** ido + +--- +*** Switching on 'ido-mode' now also overrides 'ffap-file-finder'. + +--- +*** Killing virtual ido buffers interactively will make them go away. +Previously, killing a virtual ido buffer with 'ido-kill-buffer' didn't +do anything. This has now been changed, and killing virtual buffers +with that command will remove the buffer from recentf. + +** So Long + +--- +*** New 'so-long-predicate' function 'so-long-statistics-excessive-p'. +It efficiently detects the presence of a long line anywhere in the +buffer using 'buffer-line-statistics' (see above). This is now the +default predicate (replacing 'so-long-detected-long-line-p'). + +--- +*** Default values 'so-long-threshold' and 'so-long-max-lines' increased. +The values of these user options have been raised to 10000 bytes and 500 +lines respectively, to reduce the likelihood of false-positives when +'global-so-long-mode' is enabled. The latter value is now only used +by the old predicate, as the new predicate knows the longest line in +the entire buffer. + +--- +*** 'so-long-target-modes' now includes 'fundamental-mode' by default. +This means that 'global-so-long-mode' will also process files which were +not recognised. (This only has an effect if 'set-auto-mode' chooses +'fundamental-mode'; buffers which are simply in 'fundamental-mode' by +default are unaffected.) + +--- +*** New user options to preserve modes and variables. +The new options 'so-long-mode-preserved-minor-modes' and +'so-long-mode-preserved-variables' allow specified mode and variable +states to be maintained if 'so-long-mode' replaces the original major +mode. By default, these new options support 'view-mode'. + +** Grep + ++++ +*** New user option 'grep-match-regexp' matches grep markers to highlight. +Grep emits SGR ANSI escape sequences to color its output. The new +user option 'grep-match-regexp' holds the regular expression to match +the appropriate markers in order to provide highlighting in the source +buffer. The user option can be customized to accommodate other +grep-like tools. + +--- +*** The 'lgrep' command now ignores directories. +On systems where the grep command supports it, directories will be +skipped. + +*** Commands that use 'grep-find' now follow symlinks for command-line args. +This is because the default value of 'grep-find-template' now includes +the 'find' option '-H'. Commands that use that variable, including +indirectly via a call to 'xref-matches-in-directory', might be +affected. In particular, there should be no need anymore to ensure +any directory names on the 'find' command lines end in a slash. +This change is for better compatibility with old versions of non-GNU +'find', such as the one used on macOS. + +--- +*** New utility function 'grep-file-at-point'. +This returns the name of the file at point (if any) in 'grep-mode' +buffers. + +** Shell + +--- +*** New command in 'shell-mode': 'narrow-to-prompt'. +This is bound to 'C-x n d' in 'shell-mode' buffers, and narrows to the +command line under point (and any following output). + +--- +*** New user option 'shell-has-auto-cd'. +If non-nil, 'shell-mode' handles implicit "cd" commands, changing the +directory if the command is a directory. Useful for shells like "zsh" +that has this feature. + +** term-mode + +--- +*** New user option 'term-scroll-snap-to-bottom'. +By default, 'term' and 'ansi-term' will now recenter the buffer so +that the prompt is on the final line in the window. Setting this new +user option to nil inhibits this behavior. + +--- +*** New user option 'term-set-terminal-size' +If non-nil, the 'LINES' and 'COLUMNS' environment variables will be set +based on the current window size. In previous versions of Emacs, this +was always done (and that could lead to odd displays when resizing the +window after starting). This variable defaults to nil. + +--- +*** 'term-mode' now supports "bright" color codes. +"Bright" ANSI color codes are now displayed using the color values +defined in 'term-color-bright-*'. In addition, bold text with regular +ANSI colors can be displayed as "bright" if 'ansi-color-bold-is-bright' +is non-nil. + +** Eshell + +--- +*** 'eshell-hist-ignoredups' can now also be used to mimic "erasedups" in bash. + +--- +*** Environment variable 'INSIDE_EMACS' is now copied to subprocesses. +Its value contains the result of evaluating '(format "%s,eshell" +emacs-version)'. Other package names, like "tramp", could also be included. + +--- +*** Eshell no longer re-initializes its keymap every call. +This allows users to use (define-key eshell-mode-map ...) as usual. +Some modules have their own minor mode now to account for these +changes. + +*** Support for bookmark.el. +The command 'bookmark-set' (bound to 'C-x r m') is now supported, and +will create a bookmark that opens the current directory in Eshell. + +** Archive mode + +--- +*** Archive Mode can now parse ".squashfs" files. + +*** Can now modify members of 'ar' archives. + +*** Display of summaries is unified between backends. + +*** New user option and command to control displayed columns. +New user option 'archive-hidden-columns' and new command +'archive-hideshow-column' let you control which columns are displayed +and which are kept hidden. + +--- +*** New command bound to 'C': 'archive-copy-file'. +This command extracts the file at point and writes its data to a +file. + +** browse-url + +*** Added support for custom URL handlers. +There is a new variable 'browse-url-default-handlers' and a user +option 'browse-url-handlers' being alists with '(REGEXP-OR-PREDICATE +. FUNCTION)' entries allowing to define different browsing FUNCTIONs +depending on the URL to be browsed. The variable is for default +handlers provided by Emacs itself or external packages, the user +option is for the user (and allows for overriding the default +handlers). + +Formerly, one could do the same by setting +'browse-url-browser-function' to such an alist. This usage is still +supported but deprecated. + +*** Categorization of browsing commands into internal vs. external. +All standard browsing commands such as 'browse-url-firefox', +'browse-url-mail', or 'eww' have been categorized into internal (URL +is browsed in Emacs) or external (an external application is spawned +with the URL). This is done by adding a 'browse-url-browser-kind' +symbol property to the browsing commands. With a new command +'browse-url-with-browser-kind', an URL can explicitly be browsed with +either an internal or external browser. + +--- +*** Support for browsing of remote files. +If a remote file is specified, a local temporary copy of that file is +passed to the browser. + +--- +*** Support for the conkeror browser is now obsolete. + +--- +*** Support for the Mosaic browser has been removed. +This support has been obsolete since 25.1. + +** Completion List Mode + +*** Improved navigation in the "*Completions*" buffer. +New key bindings have been added to 'completion-list-mode': 'n' and +'p' now navigate completions, and 'M-g M-c' switches to the +minibuffer and back to the completion list buffer. + ++++ +** profiler.el +The results displayed by 'profiler-report' now have the usage figures +at the left hand side followed by the function name. This is intended +to make better use of the horizontal space, in particular eliminating +the truncation of function names. There is no way to get the former +layout back. + +** Icomplete + +--- +*** New user option 'icomplete-matches-format'. +This allows controlling the current/total number of matches for the +prompt prefix. + ++++ +*** New minor modes 'icomplete-vertical-mode' and 'fido-vertical-mode'. +These modes modify Icomplete ('M-x icomplete-mode') and Fido ('M-x +fido-mode'), to display completion candidates vertically instead of +horizontally. In Icomplete, completions are rotated and selection +kept at the top. In Fido, completions scroll like a typical dropdown +widget. Both these new minor modes will turn on their non-vertical +counterparts first, if they are not on already. + +--- +*** Default value of 'icomplete-compute-delay' has been changed to 0.15 s. + +--- +*** Default value of 'icomplete-max-delay-chars' has been changed to 2. + +--- +*** Reduced blinking while completing the next completions set. +Icomplete doesn't hide the hint with the previously computed +completions anymore when compute delay is in effect, or the previous +computation has been aborted by input. Instead it shows the previous +completions until the new ones are ready. + +--- +*** Change in meaning of 'icomplete-show-matches-on-no-input'. +Previously, choosing a different completion with commands like 'C-.' +and then hitting 'RET' would choose the default completion. Doing this +will now choose the completion under point instead. Also when this option +is nil, completions are not shown when the minibuffer reads a file name +with initial input as the default directory. + +** Windmove + ++++ +*** New user options to customize windmove keybindings. +These options include 'windmove-default-keybindings', +'windmove-display-default-keybindings', +'windmove-delete-default-keybindings', +'windmove-swap-states-default-keybindings'. +Also new mode 'windmove-mode' enables the customized keybindings. + +** Occur mode + +--- +*** New bindings in occur-mode. +The command 'next-error-no-select' is now bound to 'n' and +'previous-error-no-select' is bound to 'p'. + +--- - *** The new command 'recenter-current-error'. ++*** New command 'recenter-current-error'. +It is bound to 'l' in Occur or compilation buffers, and recenters the +current displayed occurrence/error. + +--- +*** Matches in target buffers are now highlighted as in 'compilation-mode'. +The method of highlighting is specified by the user options +'next-error-highlight' and 'next-error-highlight-no-select'. + +--- +*** A fringe arrow in the "*Occur*" buffer indicates the selected match. + +--- +*** Occur mode may use a different type for 'occur-target' property values. +The value was previously always a marker set to the start of the first +match on the line but can now also be a list of '(BEGIN . END)' pairs +of markers delimiting each match on the line. +This is a fully compatible change to the internal occur-mode +implementation, and code creating their own occur-mode buffers will +work as before. + +** Emacs Lisp mode + +--- +*** The mode-line now indicates whether we're using lexical or dynamic scoping. + ++++ +*** A space between an open paren and a symbol changes the indentation rule. +The presence of a space between an open paren and a symbol now is +taken as a statement by the programmer that this should be indented +as a data list rather than as a piece of code. + +** Lisp Mode + +*** New minor mode 'cl-font-lock-built-in-mode' for 'lisp-mode'. +The mode provides refined highlighting of built-in functions, types, +and variables. + +--- +*** Lisp mode now uses 'common-lisp-indent-function'. +To revert to the previous behavior, +'(setq lisp-indent-function 'lisp-indent-function)' from 'lisp-mode-hook'. + +** Change Logs and VC + ++++ +*** 'vc-revert-show-diff' now has a third possible value: 'kill'. +If this user option is 'kill', then the diff buffer will be killed +after the 'vc-revert' action instead of buried. + +--- +*** More VC commands can be used from non-file buffers. +The relevant commands are those that don't change the VC state. +The non-file buffers which can use VC commands are those that have +their 'default-directory' under VC. + +--- +*** New face 'log-view-commit-body'. +This is used when expanding commit messages from 'vc-print-root-log' +and similar commands. + +--- +*** New faces for 'vc-dir' buffers. +Those are: 'vc-dir-header', 'vc-dir-header-value', 'vc-dir-directory', +'vc-dir-file', 'vc-dir-mark-indicator', 'vc-dir-status-warning', +'vc-dir-status-edited', 'vc-dir-status-up-to-date', +'vc-dir-status-ignored'. + +--- +*** The responsible VC backend is now the most specific one. +'vc-responsible-backend' loops over the backends in +'vc-handled-backends' to determine which backend is responsible for a +specific (unregistered) file. Previously, the first matching backend +was chosen, but now the one with the most specific path is chosen (in +case there's a directory handled by one backend inside another). + +--- +*** New command 'vc-dir-root' uses the root directory without asking. + +--- +*** New commands 'vc-dir-mark-registered-files' (bound to '* r') and +'vc-dir-mark-unregistered-files'. + +--- +*** Support for bookmark.el. +Bookmark locations can refer to VC directory buffers. + +--- +*** New user option 'vc-hg-create-bookmark'. +It controls whether a bookmark or branch will be created when you +invoke 'C-u C-x v s' ('vc-create-tag'). + +--- +*** 'vc-hg' now uses 'hg summary' to populate extra 'vc-dir' headers. + +--- +*** New user option 'vc-git-revision-complete-only-branches'. +If non-nil, only branches and remotes are considered when doing +completion over Git branch names. The default is nil, which causes +tags to be considered as well. + +--- +*** New user option 'vc-git-log-switches'. +String or list of strings specifying switches for Git log under VC. + +--- +*** Command 'vc-switch-backend' is now obsolete. +If you are still using it with any regularity, please file a bug +report with some details. + +** Gnus + ++++ +*** New user option 'gnus-topic-display-predicate'. +This can be used to inhibit the display of some topics completely. + ++++ +*** nnimap now supports the oauth2.el library. + ++++ +*** New Summary buffer sort options for extra headers. +The extra header sort option ('C-c C-s C-x') prompts for a header +and fails if no sort function has been defined. Sorting by +Newsgroups ('C-c C-s C-u') has been pre-defined. + ++++ +*** The '#' command in the Group and Summary buffer now toggles, +instead of sets, the process mark. + ++++ +*** New user option 'gnus-process-mark-toggle'. +If non-nil (the default), the '#' command in the Group and Summary +buffers will toggle, instead of set, the process mark. + ++++ +*** New user option 'gnus-registry-register-all'. +If non-nil (the default), create registry entries for all messages. +If nil, don't automatically create entries, they must be created +manually. + ++++ +*** New user options to customise the summary line specs "%[" and "%]". +Four new options introduced in customisation group +'gnus-summary-format'. These are 'gnus-sum-opening-bracket', +'gnus-sum-closing-bracket', 'gnus-sum-opening-bracket-adopted', and +'gnus-sum-closing-bracket-adopted'. Their default values are "[", "]", +"<", ">" respectively. These options control the appearance of "%[" +and "%]" specs in the summary line format. "%[" will normally display +the value of 'gnus-sum-opening-bracket', but can also be +'gnus-sum-opening-bracket-adopted' for the adopted articles. "%]" will +normally display the value of 'gnus-sum-closing-bracket', but can also +be 'gnus-sum-closing-bracket-adopted' for the adopted articles. + ++++ +*** New user option 'gnus-paging-select-next'. +This controls what happens when using commands like 'SPC' and 'DEL' to +page the current article. If non-nil (the default), go to the +next/prev article, but if nil, do nothing at the end/start of the article. + ++++ +*** New gnus-search library. +A new unified search syntax which can be used across multiple +supported search engines. Set 'gnus-search-use-parsed-queries' to +non-nil to enable. + ++++ +*** New value for user option 'smiley-style'. +Smileys can now be rendered with emojis instead of small images when +using the new 'emoji' value in 'smiley-style'. + ++++ +*** New user option 'gnus-agent-eagerly-store-articles'. +If non-nil (which is the default), the Gnus Agent will store all read +articles in the Agent cache. + ++++ +*** New user option 'gnus-global-groups'. +Gnus handles private groups differently from public (i.e., NNTP-like) +groups. Most importantly, Gnus doesn't download external images from +mail-like groups. This can be overridden by putting group names in +'gnus-global-groups': Any group present in that list will be treated +like a public group. + ++++ +*** New scoring types for the Date header. +You can now score based on the relative age of an article with the new +'<' and '>' date scoring types. + ++++ +*** User-defined scoring is now possible. +The new type is 'score-fn'. More information in the Gnus manual node +"(gnus) Score File Format". + ++++ +*** New backend 'nnselect'. +The newly added 'nnselect' backend allows creating groups from an +arbitrary list of articles that may come from multiple groups and +servers. These groups generally behave like any other group: they may +be ephemeral or persistent, and allow article marking, moving, +deletion, etc. 'nnselect' groups may be created like any other group, +but there are three convenience functions for the common case of +obtaining the list of articles as a result of a search: +'gnus-group-make-search-group' ('G g') that will prompt for an 'nnir' +search query and create a persistent group for that search; +'gnus-group-read-ephemeral-search-group' ('G G') that will prompt for +an 'nnir' search query and create an ephemeral group for that search; +and 'gnus-summary-make-group-from-search' ('C-c C-p') that will create +a persistent group with the search parameters of a current ephemeral +search group. + +As part of this addition, the user option 'nnir-summary-line-format' +has been removed; its functionality is now available directly in the +'gnus-summary-line-format' specs '%G' and '%g'. The user option +'gnus-refer-thread-use-nnir' has been renamed to +'gnus-refer-thread-use-search'. + ++++ +*** New user option 'gnus-dbus-close-on-sleep'. +On systems with D-Bus support, it is now possible to register a signal +to close all Gnus servers before the system sleeps. + ++++ +*** The key binding of 'gnus-summary-search-article-forward' has changed. +This command was previously on 'M-s' and shadowed the global 'M-s' +search prefix. The command has now been moved to 'M-s M-s'. (For +consistency, the 'M-s M-r' key binding has been added for the +'gnus-summary-search-article-backward' command.) + +--- +*** The value for "all" in the 'large-newsgroup-initial' group parameter has changed. +It was previously nil, which didn't work, because nil is +indistinguishable from not being present. The new value for "all" is +the symbol 'all'. + ++++ +*** The name of dependent Gnus sessions has changed from "slave" to "child". +The names of the commands 'gnus-slave', 'gnus-slave-no-server' and +'gnus-slave-unplugged' have changed to 'gnus-child', +'gnus-child-no-server' and 'gnus-child-unplugged' respectively. + ++++ +*** The 'W Q' summary mode command now takes a numerical prefix to +allow adjusting the fill width. + ++++ +*** New variable 'mm-inline-font-lock'. +This variable is supposed to be bound by callers to determine whether +inline MIME parts (that support it) are supposed to be font-locked or +not. + +** Message + +--- +*** Respect 'message-forward-ignored-headers' more. +Previously, this user option would not be consulted if +'message-forward-show-mml' was nil and forwarding as MIME. + ++++ +*** New user option 'message-forward-included-mime-headers'. +This is used when forwarding messages as MIME, but not using MML. + ++++ +*** Message now supports the OpenPGP header. +To generate these headers, add the new function +'message-add-openpgp-header' to 'message-send-hook'. The header will +be generated according to the new 'message-openpgp-header' user +option. + +--- +*** A change to how "Mail-Copies-To: never" is handled. +If a user has specified "Mail-Copies-To: never", and Message was asked +to do a "wide reply", some other arbitrary recipient would end up in +the resulting "To" header, while the remaining recipients would be put +in the "Cc" header. This is somewhat misleading, as it looks like +you're responding to a specific person in particular. This has been +changed so that all the recipients are put in the "To" header in these +instances. + ++++ +*** New command to start Emacs in Message mode to send an email. +Emacs can be defined as a handler for the "x-scheme-handler/mailto" +MIME type with the following command: "emacs -f message-mailto %u". +An "emacs-mail.desktop" file has been included, suitable for +installing in desktop directories like "/usr/share/applications" or +"~/.local/share/applications". +Clicking on a 'mailto:' link in other applications will then open +Emacs with headers filled out according to the link, e.g. +"mailto:larsi@gnus.org?subject=This+is+a+test". If you prefer +emacsclient, use "emacsclient -e '(message-mailto "%u")'" +or "emacsclient-mail.desktop". + +--- +*** Change to default value of 'message-draft-headers' user option. +The 'Date' symbol has been removed from the default value, meaning that +draft or delayed messages will get a date reflecting when the message +was sent. To restore the original behavior of dating a message +from when it is first saved or delayed, add the symbol 'Date' back to +this user option. + ++++ +*** New command to take screenshots. +In Message mode buffers, the 'C-c C-p' ('message-insert-screenshot') +command has been added. It depends on using an external program to +take the actual screenshot, and defaults to "ImageMagick import". + +** Smtpmail + ++++ +*** smtpmail now supports using the oauth2.el library. + ++++ +*** New user option 'smtpmail-store-queue-variables'. +If non-nil, SMTP variables will be stored together with the queued +messages, and will then be used when sending with +'M-x smtpmail-send-queued-mail'. + ++++ +*** Allow direct selection of smtp authentication mechanism. +A server entry retrieved by auth-source can request a desired smtp +authentication mechanism by setting a value for the key 'smtp-auth'. + +** ElDoc + ++++ +*** New user option 'eldoc-echo-area-display-truncation-message'. +If non-nil (the default), eldoc will display a message saying +something like "(Documentation truncated. Use `M-x eldoc-doc-buffer' +to see rest)" when a message has been truncated. If nil, truncated +messages will be marked with just "..." at the end. + ++++ +*** New hook 'eldoc-documentation-functions'. +This hook is intended to be used for registering doc string functions. +These functions don't need to produce the doc string right away, they +may arrange for it to be produced asynchronously. The results of all +doc string functions are accessible to the user through the user +option 'eldoc-documentation-strategy'. + +*** New hook 'eldoc-display-functions'. +This hook is intended to be used for displaying doc strings. The +functions receive the doc string composed according to +'eldoc-documentation-strategy' and are tasked with displaying it to +the user. Examples of such functions would use the echo area, a +separate buffer, or a tooltip. + ++++ +*** New user option 'eldoc-documentation-strategy'. +The built-in choices available for this user option let users compose +the results of 'eldoc-documentation-functions' in various ways, even +if some of those functions are synchronous and some asynchronous. +The user option replaces 'eldoc-documentation-function', which is now +obsolete. + +*** 'eldoc-echo-area-use-multiline-p' is now handled by ElDoc. +The user option 'eldoc-echo-area-use-multiline-p' is now handled +by the ElDoc library itself. Functions in +'eldoc-documentation-functions' don't need to worry about consulting +it when producing a doc string. + +** Tramp + ++++ +*** New connection method "mtp". +It allows accessing media devices like cell phones, tablets or +cameras. + ++++ +*** New connection method "sshfs". +It allows accessing remote files via a file system mounted with +'sshfs'. + ++++ +*** Tramp supports SSH authentication via a hardware security key now. +This requires at least OpenSSH 8.2, and a FIDO U2F compatible +security key, like yubikey, solokey, or nitrokey. + ++++ +*** Trashed remote files are moved to the local trash directory. +All remote files that are trashed are moved to the local trash +directory, except remote encrypted files, which are always deleted. + ++++ +*** New command 'tramp-crypt-add-directory'. +This command marks a remote directory to contain only encrypted files. +See the "(tramp) Keeping files encrypted" node of the Tramp manual for +details. This feature is experimental. + ++++ +*** Support of direct asynchronous process invocation. +When Tramp connection property "direct-async-process" is set to +non-nil for a given connection, 'make-process' and 'start-file-process' +calls are performed directly as in "ssh ... ". This avoids +initialization performance penalties. See the "(tramp) Improving +performance of asynchronous remote processes" node of the Tramp manual +for details, and also for a discussion or restrictions. This feature +is experimental. + ++++ +*** New user option 'tramp-debug-to-file'. +When non-nil, this user option instructs Tramp to mirror the debug +buffer to a file under the "/tmp/" directory. This is useful, if (in +rare cases) Tramp blocks Emacs, and we need further debug information. + ++++ +*** Tramp supports lock files now. +In order to deactivate this, set user option +'remote-file-name-inhibit-locks' to t. + ++++ +*** Writing sensitive data locally requires confirmation. +Writing auto-save, backup or lock files to the local temporary +directory must be confirmed. In order to suppress this confirmation, +set user option 'tramp-allow-unsafe-temporary-files' to t. + ++++ +*** 'make-directory' of a remote directory honors the default file modes. + +** gdb-mi + +*** New user option 'gdb-registers-enable-filter'. +If non-nil, apply a register filter based on +'gdb-registers-filter-pattern-list'. + ++++ +*** gdb-mi can now save and restore window configurations. +Use 'gdb-save-window-configuration' to save window configuration to a +file and 'gdb-load-window-configuration' to load from a file. These +commands can also be accessed through the menu bar under "Gud => +GDB-Windows". 'gdb-default-window-configuration-file', when non-nil, +is loaded when GDB starts up. + ++++ +*** gdb-mi can now restore window configuration after quitting. +Set 'gdb-restore-window-configuration-after-quit' to non-nil and Emacs +will remember the window configuration before GDB started and restore +it after GDB quits. A toggle button is also provided under "Gud => +GDB-Windows" menu item. + ++++ +*** gdb-mi now has a better logic for displaying source buffers. +Now GDB only uses one source window to display source file by default. +Customize 'gdb-max-source-window-count' to use more than one window. +Control source file display by 'gdb-display-source-buffer-action'. + ++++ +*** The default value of 'gdb-mi-decode-strings' is now t. +This means that the default coding-system is now used to decode strings +and source file names from GDB. + +** Compilation mode + +--- +*** New function 'ansi-color-compilation-filter'. +This function is meant to be used in 'compilation-filter-hook'. + +--- +*** New user option 'ansi-color-for-compilation-mode'. +This controls what 'ansi-color-compilation-filter' does. + +*** Regexp matching of messages is now case-sensitive by default. +The variable 'compilation-error-case-fold-search' can be set for +case-insensitive matching of messages when the old behavior is +required, but the recommended solution is to use a correctly matching +regexp instead. + +--- +*** New user option 'compilation-search-all-directories'. +When doing parallel builds, directories and compilation errors may +arrive in the "*compilation*" buffer out-of-order. If this option is +non-nil (the default), Emacs will now search backwards in the buffer +for any directory the file with errors may be in. If nil, this won't +be done (and this restores how this previously worked). + +--- +*** Messages from ShellCheck are now recognized. + +--- +*** Messages from Visual Studio that mention column numbers are now recognized. + +** Hi Lock mode + +--- +*** Matching in 'hi-lock-mode' can be case-sensitive. +The matching is case-sensitive when a regexp contains upper case +characters and 'search-upper-case' is non-nil. 'highlight-phrase' +also uses 'search-whitespace-regexp' to substitute spaces in regexp +search. + +--- +*** The default value of 'hi-lock-highlight-range' was enlarged. +The new default value is 2000000 (2 megabytes). + +** Whitespace mode + ++++ +*** New style 'missing-newline-at-eof'. +If present in 'whitespace-style' (as it is by default), the final +character in the buffer will be highlighted if the buffer doesn't end +with a newline. + +--- +*** The default 'whitespace-enable-predicate' predicate has changed. +It used to check elements in the list version of +'whitespace-global-modes' with 'eq', but now uses 'derived-mode-p'. + +** Texinfo + +--- +*** New user option 'texinfo-texi2dvi-options'. +This is used when invoking 'texi2dvi' from 'texinfo-tex-buffer'. + +--- +*** New commands for moving in and between environments. +An "environment" is something that ends with '@end'. The commands are +'C-c C-c C-f' (next end), 'C-c C-c C-b' (previous end), +'C-c C-c C-n' (next start) and 'C-c C-c C-p' (previous start), as well +as 'C-c .', which will alternate between the start and the end of the +current environment. + +** Rmail + +--- +*** New user option 'rmail-re-abbrevs'. +Its default value matches localized abbreviations of the "reply" +prefix on the Subject line in various languages. + +--- +*** New user option 'rmail-show-message-set-modified'. +If set non-nil, showing an unseen message will set the Rmail buffer's +modified flag. The default is nil, to preserve the old behavior. + +** CC Mode + ++++ +*** Added support for Doxygen documentation style. +'doxygen' is now a valid 'c-doc-comment-style' which recognises all +comment styles supported by Doxygen (namely '///', '//!', '/** … */' +and '/*! … */'. 'gtkdoc' remains the default for C and C++ modes; to +use 'doxygen' by default one might evaluate: + + (setq-default c-doc-comment-style + '((java-mode . javadoc) + (pike-mode . autodoc) + (c-mode . doxygen) + (c++-mode . doxygen))) + +or use it in a custom 'c-style'. + ++++ +*** Added support to line up '?' and ':' of a ternary operator. +The new 'c-lineup-ternary-bodies' function can be used as a lineup +function to align question mark and colon which are part of a ternary +operator ('?:'). For example: + + return arg % 2 == 0 ? arg / 2 + : (3 * arg + 1); + +To enable, add it to appropriate entries in 'c-offsets-alist', e.g.: + + (c-set-offset 'arglist-cont '(c-lineup-ternary-bodies + c-lineup-gcc-asm-reg)) + (c-set-offset 'arglist-cont-nonempty '(c-lineup-ternary-bodies + c-lineup-gcc-asm-reg + c-lineup-arglist)) + (c-set-offset 'statement-cont '(c-lineup-ternary-bodies +)) + +** Images + +--- +*** You can explicitly specify base_uri for svg images. +':base-uri' image property can be used to explicitly specify base_uri +for embedded images into svg. ':base-uri' is supported for both file +and data svg images. + ++++ +*** 'svg-embed-base-uri-image' added to embed images. +'svg-embed-base-uri-image' can be used to embed images located +relatively to 'file-name-directory' of the ':base-uri' svg image property. +This works much faster than 'svg-embed'. + ++++ +*** New function 'image-cache-size'. +This function returns the size of the current image cache, in bytes. + +--- +*** Animated images stop automatically under high CPU pressure sooner. +Previously, an animated image would stop animating if any single image +took more than two seconds to display. The new algorithm maintains a +decaying average of delays, and if this number gets too high, the +animation is stopped. + ++++ +*** The 'n' and 'p' commands (next/previous image) now respect Dired order. +These commands would previously display the next/previous image in +lexicographic order, but will now find the "parent" Dired buffer and +select the next/previous image file according to how the files are +sorted there. The commands have also been extended to work when the +"parent" buffer is an archive mode (i.e., zip file or the like) or tar +mode buffer. + +--- +*** 'image-converter' is now restricted to formats in 'auto-mode-alist'. +When using external image converters, the external program is queried +for what formats it supports. This list may contain formats that are +problematic in some contexts (like PDFs), so this list is now filtered +based on 'auto-mode-alist'. Only file names that map to 'image-mode' +are now supported. + +--- +*** The background and foreground of images now default to face colors. +When an image doesn't specify a foreground or background color, Emacs +now uses colors from the face used to draw the surrounding text +instead of the frame's default colors. + +To load images with the default frame colors use the ':foreground' and +':background' image attributes, for example: + + (create-image "filename" nil nil + :foreground (face-attribute 'default :foreground) + :background (face-attribute 'default :background)) + +This change only affects image types that support foreground and +background colors or transparency, such as xbm, pbm, svg, png and gif. + ++++ +*** Image smoothing can now be explicitly enabled or disabled. +Smoothing applies a bilinear filter while scaling or rotating an image +to prevent aliasing and other unwanted effects. The new image +property ':transform-smoothing' can be set to t to force smoothing +and nil to disable smoothing. + +The default behavior of smoothing on down-scaling and not smoothing +on up-scaling remains unchanged. + ++++ +*** New user option 'image-transform-smoothing'. +This controls whether to use smoothing or not for an image. Values +include nil (no smoothing), t (do smoothing) or a predicate function +that's called with the image object and should return nil/t. + ++++ +*** SVG images now support user stylesheets. +The ':css' image attribute can be used to override the default CSS +stylesheet for an image. The default sets 'font-family' and +'font-size' to match the current face, so an image with 'height="1em"' +will match the font size in use where it is embedded. + +This feature relies on librsvg 2.48 or above being available. + ++++ +*** Image properties support 'em' sizes. +Size image properties, for example ':height', ':max-height', etc., can +be given a cons of the form '(SIZE . em)', where SIZE is an integer or +float which is multiplied by the font size to calculate the image +size, and 'em' is a symbol. + +** EWW + ++++ +*** New user option 'eww-use-browse-url'. +This is a regexp that can be set to alter how links are followed in eww. + ++++ +*** New user option 'eww-retrieve-command'. +This can be used to download data via an external command. If nil +(the default), then 'url-retrieve' is used. When 'sync', then +'url-retrieve-synchronously' is used. A list of strings specifies +an external program with parameters. + ++++ +*** New Emacs command line convenience command. +The 'eww-browse' command has been added, which allows you to register +Emacs as a MIME handler for "text/x-uri", and will call 'eww' on the +supplied URL. Usage example: "emacs -f eww-browse https://gnu.org". + ++++ +*** 'eww-download-directory' will now use the XDG location, if defined. +However, if "~/Downloads/" already exists, that will continue to be +used. + +--- +*** The command 'eww-follow-link' now supports custom mailto: handlers. +The function that is invoked when clicking on or otherwise following a +'mailto:' link in an EWW buffer can now be customized. For more +information, see the related entry about 'shr-browse-url' below. + +--- +*** Support for bookmark.el. +The command 'bookmark-set' (bound to 'C-x r m') is now supported, and +will create a bookmark that opens the current URL in EWW. + +** SHR + +--- +*** The command 'shr-browse-url' now supports custom mailto handlers. +Clicking on or otherwise following a 'mailto:' link in an HTML buffer +rendered by SHR previously invoked the command 'browse-url-mailto'. +This is still the case by default, but if you customize +'browse-url-mailto-function' or 'browse-url-handlers' to call some +other function, it will now be called instead of the default. + +--- +*** New user option 'shr-offer-extend-specpdl'. +If this is nil, rendering of HTML that requires enlarging +'max-specpdl-size', the number of Lisp variable bindings, will be +aborted, and Emacs will not ask you whether to enlarge +'max-specpdl-size' to complete the rendering. The default is t, which +preserves the original behavior. + ++++ +*** New user option 'shr-max-width'. +If this user option is non-nil, and 'shr-width' is nil, then SHR will +use the value of 'shr-max-width' to limit the width of the rendered +HTML. The default is 120 characters, so even if you have very wide +frames, HTML text will be rendered more narrowly, which usually leads +to a more readable text. Customize it to nil to get the previous +behavior of rendering as wide as the 'window-width' allows. If +'shr-width' is non-nil, it overrides this option. + +--- +*** New faces for heading elements. +Those are 'shr-h1', 'shr-h2', 'shr-h3', 'shr-h4', 'shr-h5', 'shr-h6'. + +** Project + +--- +*** New user option 'project-vc-merge-submodules'. + +--- +*** Project commands now have their own history. +Previously used project directories are now suggested by all commands +that prompt for a project directory. + ++++ +*** New prefix keymap 'project-prefix-map'. +Key sequences that invoke project-related commands start with the +prefix 'C-x p'. Type 'C-x p C-h' to show the full list. + ++++ +*** New commands 'project-dired', 'project-vc-dir', 'project-shell', +'project-eshell'. These commands run Dired/VC-Dir and Shell/Eshell in +a project's root directory, respectively. + ++++ +*** New command 'project-compile'. +This command runs compilation in the current project's root directory. + ++++ +*** New command 'project-switch-project'. +This command lets you "switch" to another project and run a project +command chosen from a dispatch menu. + ++++ +*** New commands 'project-shell-command' and 'project-async-shell-command'. +These commands run 'shell-command' and 'async-shell-command' in a +project's root directory, respectively. + ++++ +*** New user option 'project-list-file'. +This specifies the file in which to save the list of known projects. + ++++ +*** New command 'project-remember-projects-under'. +This command can automatically locate and index projects in a +directory and optionally also its subdirectories, storing them in +'project-list-file'. + ++++ +*** New commands 'project-forget-project' and 'project-forget-projects-under'. +These commands let you interactively remove entries from the list of projects +in 'project-list-file'. + ++++ +*** New command 'project-forget-zombie-projects'. +This command detects indexed projects that have since been deleted, +and removes them from the list of known projects in 'project-list-file'. + +--- +*** 'project-find-file' now accepts non-existent file names. +This is to allow easy creation of files inside some nested +sub-directory. + ++++ +*** 'project-find-file' doesn't use the string at point as default input. +Now it's only suggested as part of the "future history", accessible +via 'M-n'. + ++++ +*** New command 'project-find-dir' runs Dired in a directory inside project. + +** Xref + ++++ +*** New user options to automatically show the first Xref match. +The new user option 'xref-auto-jump-to-first-definition' controls the +behavior of 'xref-find-definitions' and its variants, like +'xref-find-definitions-other-window': if it's t or 'show', the first +match is automatically displayed; if it's 'move', point in the +"*xref*" buffer is automatically moved to the first match without +displaying it. +The new user option 'xref-auto-jump-to-first-xref' changes the +behavior of Xref commands such as 'xref-find-references', +'xref-find-apropos', and 'project-find-regexp', which are expected to +display many matches that the user would like to +visit. 'xref-auto-jump-to-first-xref' changes their behavior much in +the same way as 'xref-auto-jump-to-first-definition' affects the +"find-definitions" commands. + +--- +*** New user options 'xref-search-program' and 'xref-search-program-alist'. +So far 'grep' and 'ripgrep' are supported. 'ripgrep' seems to offer better +performance in certain cases, in particular for case-insensitive +searches. + ++++ +*** New commands 'xref-prev-group' and 'xref-next-group'. +These commands are bound respectively to 'P' and 'N', and navigate to +the first item of the previous or next group in the "*xref*" buffer. + +--- +*** New alternative value for 'xref-show-definitions-function': +'xref-show-definitions-completing-read'. + +--- +*** The two existing alternatives for 'xref-show-definitions-function' +have been renamed to have "proper" public names and documented +('xref-show-definitions-buffer' and +'xref-show-definitions-buffer-at-bottom'). + ++++ +*** New command 'xref-quit-and-pop-marker-stack'. +This command is bound to 'M-,' in "*xref*" buffers. This combination +is easy to press semi-accidentally if the user wants to go back in the +middle of choosing the exact definition to go to, and this should do +TRT. + +--- +*** New value 'project-relative' for 'xref-file-name-display'. +If chosen, file names in "*xref*" buffers will be displayed relative +to the 'project-root' of the current project, when available. + +--- +*** Prefix arg of 'xref-goto-xref' quits the "*xref*" buffer. +So typing 'C-u RET' in the "*xref*" buffer quits its window +before navigating to the selected location. + ++++ +*** The 'TAB' key binding in "*xref*" buffers is obsolete. +Use 'C-u RET' instead. The 'TAB' binding in "*xref*" buffers is still +supported, but we plan on removing it in a future version; at that +time, the command 'xref-quit-and-goto-xref' will no longer have a key +binding in 'xref--xref-buffer-mode-map'. + +--- +*** New user option 'etags-xref-prefer-current-file'. +When non-nil, matches for identifiers in the file visited by the +current buffer will be shown first in the "*xref*" buffer. + ++++ +*** The etags Xref backend now honors 'tags-apropos-additional-actions'. +You can customize it to augment the output of 'xref-find-apropos', +like it affected the output of 'tags-apropos', which is obsolete since +Emacs 25.1. + +** Battery + +--- +*** UPower is now the default battery status backend when available. +UPower support via the function 'battery-upower' was added in Emacs +26.1, but was disabled by default. It is now the default value of +'battery-status-function' when the system provides a UPower D-Bus +service. The user options 'battery-upower-device' and +'battery-upower-subscribe' control which power sources to query and +whether to respond to status change notifications in addition to +polling, respectively. + +--- +*** A richer syntax can be used to format battery status information. +The user options 'battery-mode-line-format' and +'battery-echo-area-format' now support the full formatting syntax of +the function 'format-spec' documented under node "(elisp) Custom Format +Strings". The new syntax includes specifiers for padding and +truncation, amongst other things. + +** bug-reference.el + +--- +*** Bug reference mode uses auto-setup. +If 'bug-reference-mode' or 'bug-reference-prog-mode' have been +activated, their respective hook has been run, and both +'bug-reference-bug-regexp' and 'bug-reference-url-format' are still +not set, it tries to guess appropriate values for those two variables. +There are three guessing mechanisms so far: based on version control +information of the current buffer's file, based on +newsgroup/mail-folder name and several news and mail message headers +in Gnus buffers, and based on IRC channel and network in rcirc and ERC +buffers. All the mechanisms are extensible with custom rules, see the +variables 'bug-reference-setup-from-vc-alist', +'bug-reference-setup-from-mail-alist', and +'bug-reference-setup-from-irc-alist'. + +** HTML Mode + +--- +*** A new skeleton for adding relative URLs has been added. +It's bound to the 'C-c C-c f' keystroke, and prompts for a local file +name. + +** Widget + ++++ +*** 'widget-choose' now supports menus in extended format. + +--- +*** The 'editable-list' widget now supports moving items up and down. +You can now move items up and down by deleting and then reinserting +them, using the 'DEL' and 'INS' buttons respectively. This is useful +in Custom buffers, for example, to change the order of the elements in +a list. + +** Diff + +--- +*** New face 'diff-changed-unspecified'. +This is used to highlight "changed" lines (those marked with '!') in +context diffs, when 'diff-use-changed-face' is non-nil. + +--- +*** New 'diff-mode' font locking face 'diff-error'. +This face is used for error messages from 'diff'. + ++++ +*** New command 'diff-refresh-hunk'. +This new command (bound to 'C-c C-l') regenerates the current hunk. + +** thing-at-point + ++++ +*** New 'thing-at-point' target: 'existing-filename'. +This is like 'filename', but is a full path, and is nil if the file +doesn't exist. + ++++ +*** New 'thing-at-point' target: 'string'. +If point is inside a string, it returns that string. + ++++ +*** New variable 'thing-at-point-provider-alist'. +This allows mode-specific alterations to how 'thing-at-point' works. + +--- +*** thing-at-point now respects fields. +'thing-at-point' (and all functions that use it, like +'symbol-at-point') will narrow to the current field (if any) before +trying to identify the thing at point. + +--- +*** New function 'thing-at-mouse'. +This is like 'thing-at-point', but uses the mouse event position instead. + +** Image-Dired + ++++ +*** New user option 'image-dired-thumb-visible-marks'. +If non-nil (the default), use the new face 'image-dired-thumb-mark' +for marked images. + +--- +*** New command 'image-dired-delete-marked'. + +--- +*** 'image-dired-mouse-toggle-mark' is now sensitive to the active region. +If the region is active, this command now toggles Dired marks of all +the thumbnails in the region. + +** Flymake mode + ++++ +*** New command 'flymake-show-project-diagnostics'. +This lists all diagnostics for buffers in the currently active +project. The listing is similar to the one obtained by +'flymake-show-buffer-diagnostics', but adds a column for the +project-relative file name. For backends which support it, +'flymake-show-project-diagnostics' also lists diagnostics for files +that have not yet been visited. + ++++ +*** New user options to customize Flymake's mode-line. +The new user option 'flymake-mode-line-format' is a mix of strings and +symbols like 'flymake-mode-line-title', 'flymake-mode-line-exception' +and 'flymake-mode-line-counters'. The new user option +'flymake-mode-line-counter-format' is a mix of strings and symbols +like 'flymake-mode-line-error-counter', +'flymake-mode-line-warning-counter' and 'flymake-mode-line-note-counter'. + +** Time + +--- +*** 'display-time-world' has been renamed to 'world-clock'. +'world-clock' creates a buffer with an updating time display using +several time zones. It is hoped that the new names are more +discoverable. + +The following commands have been renamed: + + 'display-time-world' to 'world-clock' + 'display-time-world-mode' to 'world-clock-mode' + 'display-time-world-display' to 'world-clock-display' + 'display-time-world-timer' to 'world-clock-update' + +The following user options have been renamed: + + 'display-time-world-list' to 'world-clock-list' + 'display-time-world-time-format' to 'world-clock-time-format' + 'display-time-world-buffer-name' to 'world-clock-buffer-name' + 'display-time-world-timer-enable' to 'world-clock-timer-enable' + 'display-time-world-timer-second' to 'world-clock-timer-second' + +The old names are now obsolete. + +--- +*** 'world-clock-mode' can no longer be turned on interactively. +Use 'world-clock' to turn on that mode. + +** Python mode + +--- +*** New user option 'python-forward-sexp-function'. +This allows the user easier customization of whether to use block-based +navigation or not. + +--- +*** 'python-shell-interpreter' now defaults to python3 on systems with python3. + +--- +*** 'C-c C-r' can now be used on arbitrary regions. +The command previously extended the start of the region to the start +of the line, but will now actually send the marked region, as +documented. + +** Ruby Mode + +--- +*** 'ruby-use-smie' is declared obsolete. +SMIE is now always enabled and 'ruby-use-smie' only controls whether +indentation is done using SMIE or with the old ad-hoc code. + +--- +*** Indentation has changed when 'ruby-align-chained-calls' is non-nil. +This previously used to align subsequent lines with the last sibling, +but it now aligns with the first sibling (which is the preferred style +in Ruby). + +** CPerl Mode + +--- +*** New face 'perl-heredoc', used for heredoc elements. + +--- +*** The command 'cperl-set-style' offers the new value "PBP". +This value customizes Emacs to use the style recommended in Damian +Conway's book "Perl Best Practices" for indentation and formatting +of conditionals. + +** Perl mode + +--- +*** New face 'perl-non-scalar-variable'. +This is used to fontify non-scalar variables. + +** Octave Mode + ++++ +*** Line continuations in double-quoted strings now use a backslash. +Typing 'C-M-j' (bound to 'octave-indent-new-comment-line') now follows +the behavior introduced in Octave 3.8 of using a backslash as a line +continuation marker within double-quoted strings, and an ellipsis +everywhere else. + ++++ +** EasyPG +GPG key servers can now be queried for keys with the +'M-x epa-search-keys' command. Keys can then be added to your +personal key ring. + +** Etags + ++++ +*** Etags now supports the Mercury programming language. +See https://mercurylang.org. + ++++ +*** Etags command line option '--declarations' now has Mercury-specific behavior. +All Mercury declarations are tagged by default. However, for +compatibility with 'etags' support for Prolog, predicates and +functions appearing first in clauses will also be tagged if 'etags' is +invoked with the '--declarations' command-line option. + +** Comint + ++++ +*** Support for OSC escape sequences. +Adding the new 'comint-osc-process-output' to +'comint-output-filter-functions' enables the interpretation of OSC +("Operating System Command") escape sequences in comint buffers. By +default, only OSC 8, for hyperlinks, and OSC 7, for directory +tracking, are acted upon. Adding more entries to +'comint-osc-handlers' allows a customized treatment of further escape +sequences. + ++++ +*** 'comint-delete-output' can now save deleted text in the kill-ring. +Interactively, 'C-u C-c C-o' triggers this new optional behavior. + +** ansi-color.el + +--- +*** Colors are now defined by faces. +ANSI SGR codes now have corresponding faces to describe their +appearance, e.g. 'ansi-color-bold'. + +--- +*** Support for "bright" color codes. +"Bright" ANSI color codes are now displayed when applying ANSI color +filters using the color values defined by the faces +'ansi-color-bright-COLOR'. In addition, bold text with regular ANSI +colors can be displayed as "bright" if 'ansi-color-bold-is-bright' is +non-nil. + +** ERC + +*** Starting with Emacs 28.1 and ERC 5.4, see the ERC-NEWS file for +user-visible changes in ERC. + +** xwidget-webkit mode + +--- +*** New xwidget commands. +'xwidget-webkit-uri' (return the current URL), 'xwidget-webkit-title' +(return the current title), and 'xwidget-webkit-goto-history' (goto a +point in history). + +--- +*** Downloading files from xwidget-webkit is now supported. +The new user option 'xwidget-webkit-download-dir' says where to download to. + +--- +*** New command 'xwidget-webkit-clone-and-split-below'. +Open a new window below displaying the current URL. + +--- +*** New command 'xwidget-webkit-clone-and-split-right'. +Open a new window to the right displaying the current URL. + +--- +*** Pixel-based scrolling. +The 'xwidget-webkit-scroll-up', 'xwidget-webkit-scroll-down' commands +now supports scrolling arbitrary pixel values. It now treats the +optional 2nd argument as the pixel values to scroll. + +--- +*** New commands for scrolling. +The new commands 'xwidget-webkit-scroll-up-line', +'xwidget-webkit-scroll-down-line', 'xwidget-webkit-scroll-forward', +'xwidget-webkit-scroll-backward' can be used to scroll webkit by the +height of lines or width of chars. + +--- +*** New user option 'xwidget-webkit-bookmark-jump-new-session'. +When non-nil, use a new xwidget webkit session after bookmark jump. +Otherwise, it will use 'xwidget-webkit-last-session'. + +** Checkdoc + +--- +*** No longer warns about command substitutions by default. +Checkdoc used to warn about "too many command substitutions" (as in +"\\[foo-command]"), even if you only used ten of them in a docstring. +On modern machines, you can have hundreds or thousands of command +substitutions before it becomes a performance issue, so this warning +is now disabled by default. To re-enable this warning, customize the +user option 'checkdoc-max-keyref-before-warn'. + +--- +*** New user option 'checkdoc-column-zero-backslash-before-paren'. +Checkdoc warns if there is a left parenthesis in column zero of a +documentation string. That warning can now be disabled by customizing +this new user option to nil. This is useful if you don't expect +your code to be edited with an Emacs older than version 27.1. + +--- +*** Now checks the prompt format for 'yes-or-no-p'. +In addition to verifying the format of the prompt for 'y-or-n-p', +checkdoc will now check the format of 'yes-or-no-p'. + +--- +*** New command 'checkdoc-dired'. +This can be used to run checkdoc on files from a Dired buffer. + +--- +*** No longer checks for 'A-' modifiers. +Checkdoc recommends usage of command substitutions ("\\[foo-command]") +in favor of writing keybindings like 'C-c f'. It now no longer warns +about the 'A-' modifier as it is not used very much in practice, and +this warning therefore mostly led to false positives. + +** Enriched mode + +--- +*** 'C-a' is by default no longer bound to 'beginning-of-line-text'. +This is so 'C-a' works as in other modes, and in particular holding +Shift while typing 'C-a', i.e. 'C-S-a', will now highlight the text. + +** Gravatar + +--- +*** New user option 'gravatar-service' for host to query for gravatars. +Defaults to 'libravatar', with 'unicornify' and 'gravatar' as options. + +** MH-E mail handler for Emacs + +Functions and variables related to handling junk mail have been +renamed to not associate color with sender quality. + ++++ +*** New names for mh-junk interactive functions. +Function 'mh-junk-whitelist' is renamed 'mh-junk-allowlist'. +Function 'mh-junk-blacklist' is renamed 'mh-junk-blocklist'. + ++++ +*** New binding for 'mh-junk-allowlist'. +The key binding for 'mh-junk-allowlist' is changed from 'J w' to 'J a'. +The old binding is supported but warns that it is obsolete. + ++++ +*** New names for some hooks. +'mh-whitelist-msg-hook' is renamed 'mh-allowlist-msg-hook'. +'mh-blacklist-msg-hook' is renamed 'mh-blocklist-msg-hook'. + ++++ +*** New names for some user options. +User option 'mh-whitelist-preserves-sequences-flag' is renamed +'mh-allowlist-preserves-sequences-flag'. + ++++ +*** New names for some faces. +Face 'mh-folder-blacklisted' is renamed 'mh-folder-blocklisted'. +Face 'mh-folder-whitelisted' is renamed 'mh-folder-allowlisted'. + +** Rcirc + ++++ +*** rcirc now supports SASL authentication. + +--- +*** #emacs on Libera.chat has been added to 'rcirc-server-alist'. + +--- +*** rcirc connects asynchronously. + +--- +*** Integrate formatting into 'rcirc-send-string'. +The function now accepts a variable number of arguments. + ++++ +*** Deprecate 'rcirc-command' in favor of 'rcirc-define-command'. +The new macro handles multiple and optional arguments. + +--- +*** Add basic IRCv3 support. +This includes support for the capabilities: 'server-time', 'batch', +'message-ids', 'invite-notify', 'multi-prefix' and 'standard-replies'. + +--- +*** Add mouse property support to 'rcirc-track-minor-mode'. + +--- +*** Improve support for IRC markup codes. + +--- +*** Check 'auth-sources' for server passwords. + ++++ +*** Implement repeated reconnection strategy. +See 'rcirc-reconnect-attempts'. + +** MPC + +--- +*** New command 'mpc-goto-playing-song'. +This command, bound to 'o' in any 'mpc-mode' buffer, moves point to +the currently playing song in the "*MPC-Songs*" buffer. + +--- +*** New user option 'mpc-cover-image-re'. +If non-nil, it is a regexp that should match a valid cover image. + +** Miscellaneous + +--- +*** 'shell-script-mode' now supports 'outline-minor-mode'. +The outline headings have lines that start with "###". + +--- +*** fileloop will now skip missing files instead of signalling an error. + +--- +*** 'tabulated-list-mode' can now restore original display order. +Many commands (like 'C-x C-b') are derived from 'tabulated-list-mode', +and that mode allows the user to sort on any column. There was +previously no easy way to get back to the original displayed order +after sorting, but giving a -1 numerical prefix to the sorting command +will now restore the original order. + +--- +*** 'M-left' and 'M-right' now move between columns in 'tabulated-list-mode'. + +--- +*** New variable 'hl-line-overlay-priority'. +This can be used to change the priority of the hl-line overlays. + ++++ +*** New command 'mailcap-view-file'. +This command will open a viewer based on the file type, as determined +by "~/.mailcap" and related files and variables. + +--- +*** New user option 'remember-diary-regexp'. + +--- +*** New user option 'remember-text-format-function'. + +--- +*** New user option 'authinfo-hide-elements'. +This can be set to nil to inhibit hiding passwords in ".authinfo" files. + +--- +*** 'hexl-mode' scrolling commands now heed 'next-screen-context-lines'. +Previously, 'hexl-scroll-down' and 'hexl-scroll-up' would scroll +up/down an entire window, but they now work more like the standard +scrolling commands. + +--- +*** New user option 'bibtex-unify-case-function'. +This new option allows the user to customize how case is converted +when unifying entries. + +--- +*** The user option 'bibtex-maintain-sorted-entries' now permits +user-defined sorting schemes. + +--- +*** New user option 'reveal-auto-hide'. +If non-nil (the default), revealed text is automatically hidden when +point leaves the text. If nil, the text is not hidden again. Instead +'M-x reveal-hide-revealed' can be used to hide all the revealed text. + +--- +*** New user option 'ffap-file-name-with-spaces'. +If non-nil, 'find-file-at-point' and friends will try to guess more +expansively to identify a file name with spaces. Default value is +nil. + +--- +*** Two new commands for centering in 'doc-view-mode'. +The new commands 'doc-view-center-page-horizontally' (bound to 'c h') +and 'doc-view-center-page-vertically' (bound to 'c v') center the page +horizontally and vertically, respectively. + +--- +*** 'tempo-define-template' can now re-assign templates to tags. +Previously, assigning a new template to an already defined tag had no +effect. + +--- +*** The width of the buffer-name column in 'list-buffers' is now dynamic. +The width now depends on the width of the window, but will never be +wider than the length of the longest buffer name, except that it will +never be narrower than 19 characters. + ++++ +*** New diary sexp 'diary-offset'. +It offsets another diary sexp by a number of days. This is useful +when for example your organization has a committee meeting two days +after every monthly meeting which takes place on the third Thursday, +or if you would like to attend a virtual meeting scheduled in a +different timezone causing a difference in the date. + +--- +*** The old non-SMIE indentation of 'sh-mode' has been removed. + +--- +*** 'mspools-show' is now autoloaded. + +--- +*** Loading dunnet.el in batch mode doesn't start the game any more. +Instead you need to do "emacs -f dun-batch" to start the game in +batch mode. + + +* New Modes and Packages in Emacs 28.1 + ++++ +** New mode 'repeat-mode' to allow shorter key sequences. +Type 'M-x repeat-mode' to enable this mode. You can then type +'C-x u u' instead of 'C-x u C-x u' to undo many changes, 'C-x o o' +instead of 'C-x o C-x o' to switch windows, 'C-x { { } } ^ ^ v v' to +resize the selected window interactively, 'M-g n n p p' to navigate +next-error matches. Any other key exits this temporarily enabled +transient mode that supports shorter keys, and then after exiting from +this mode, the last typed key uses the default key binding. + +The user option 'repeat-exit-key' defines an additional key usable to +exit the mode like 'isearch-exit' ('RET'). + +The user option 'repeat-exit-timeout' (default nil, which means +forever) specifies the number of seconds of idle time after which to +break the repetition chain automatically. + +When user option 'repeat-keep-prefix' is non-nil (the default), the +prefix arg of the previous command is kept. This can be used to +e.g. reverse the window navigation direction with 'C-x o M-- o o' or +to set a new step with 'C-x { C-5 { { {', which will set the window +resizing step to 5 columns. + +'M-x describe-repeat-maps' will display a buffer showing +which commands are repeatable in 'repeat-mode'. + +--- +** New themes 'modus-vivendi' and 'modus-operandi'. +These themes are designed to conform with the highest standard for +color-contrast accessibility (WCAG AAA). You can load either of them +using 'M-x customize-themes' or 'load-theme' from your init file. +Consult the Modus Themes Info manual for more information on the user +options they provide. + +** Dictionary mode +This is a mode for searching a RFC 2229 dictionary server. +'dictionary' opens a buffer for starting operations. +'dictionary-search' performs a lookup for a word. It also supports a +'dictionary-tooltip-mode' which performs a lookup of the word under +the mouse in 'dictionary-tooltip-dictionary' (which must be customized +first). + +--- +** Lisp Data mode +The new command 'lisp-data-mode' enables a major mode for buffers +composed of Lisp symbolic expressions that do not form a computer +program. The ".dir-locals.el" file is automatically set to use this +mode, as are other data files produced by Emacs. + ++++ +** New global mode 'global-goto-address-mode'. +This will enable 'goto-address-mode' in all buffers. + +** transient.el +This library implements support for powerful keyboard-driven menus. +Such menus can be used as simple visual command dispatchers. More +complex menus take advantage of infix arguments, which are somewhat +similar to prefix arguments, but are more flexible and discoverable. + +** hierarchy.el +This library can create, query, navigate and display hierarchical +structures. + +--- +** New major mode for displaying the "etc/AUTHORS" file. +This new 'etc-authors-mode' provides font-locking for displaying the +"etc/AUTHORS" file from the Emacs distribution, and not much else. + + +* Incompatible Lisp Changes in Emacs 28.1 + ++++ +** Emacs now prints a backtrace when signaling an error in batch mode. +This makes debugging Emacs Lisp scripts run in batch mode easier. To +get back the old behavior, set the new variable +'backtrace-on-error-noninteractive' to a nil value. + +--- +** Some floating-point numbers are now handled differently by the Lisp reader. +In previous versions of Emacs, numbers with a trailing dot and an exponent +were read as integers and the exponent ignored: 2.e6 was interpreted as the +integer 2. Such numerals are now read as floats with the exponent included: +2.e6 is now read as the floating-point value 2000000.0. +That is, '(read-from-string "1.e3")' => '(1000.0 . 4)' now. + +--- +** 'equal' no longer examines some contents of window configurations. +Instead, it considers window configurations to be equal only if they +are 'eq'. To compare contents, use 'compare-window-configurations' +instead. This change helps fix a bug in 'sxhash-equal', which returned +incorrect hashes for window configurations and some other objects. + ++++ +** The 'lexical-binding' local variable is always enabled. +Previously, if 'enable-local-variables' was nil, a 'lexical-binding' +local variable would not be heeded. This has now changed, and a file +with a 'lexical-binding' cookie is always heeded. To revert to the +old behavior, set 'permanently-enabled-local-variables' to nil. + ++++ +** '&rest' in argument lists must always be followed by a variable name. +Omitting the variable name after '&rest' was previously tolerated in +some cases but not consistently so; it could lead to crashes or +outright wrong results. Since the utility was marginal at best, it is +now an error to omit the variable. + +--- +** 'kill-all-local-variables' has changed how it handles non-symbol hooks. +The function is documented to eliminate all buffer-local bindings +except variables with a 'permanent-local' property, or hooks that +have elements with a 'permanent-local-hook' property. In addition, it +would also keep lambda expressions in hooks sometimes. The latter has +now been changed: The function will now also remove these. + ++++ +** Temporary buffers no longer run certain buffer hooks. +The macros 'with-temp-buffer' and 'with-temp-file' no longer run the +hooks 'kill-buffer-hook', 'kill-buffer-query-functions', and +'buffer-list-update-hook' for the temporary buffers they create. This +avoids slowing them down when a lot of these hooks are defined. + ++++ +** New face 'child-frame-border' and frame parameter 'child-frame-border-width'. +The face and width of child frames borders can now be determined +separately from those of normal frames. To minimize backward +incompatibility, child frames without a 'child-frame-border-width' +parameter will fall back to using 'internal-border-width'. However, +the new 'child-frame-border' face does constitute a breaking change +since child frames' borders no longer use the 'internal-border' face. + +--- +** 'run-at-time' now tries harder to implement the t TIME parameter. +If TIME is t, the timer runs at an integral multiple of REPEAT. +(I.e., if given a REPEAT of 60, it'll run at 08:11:00, 08:12:00, +08:13:00.) However, when a machine goes to sleep (or otherwise didn't +get a time slot to run when the timer was scheduled), the timer would +then fire every 60 seconds after the time the timer was fired. This +has now changed, and the timer code now recomputes the integral +multiple every time it runs, which means that if the laptop wakes at +08:16:43, it'll fire at that time, but then at 08:17:00, 08:18:00... + +--- +** 'parse-partial-sexp' now signals an error if TO is smaller than FROM. +Previously, this would lead to the function interpreting FROM as TO and +vice versa, which would be confusing when passing in OLDSTATE, which +refers to the old state at FROM. + ++++ +** 'global-mode-string' constructs should end with a space. +This was previously not formalized, which led to combinations of modes +displaying data "smushed together" on the mode line. + ++++ +** 'overlays-in' now handles zero-length overlays slightly differently. +Previously, zero-length overlays at the end of the buffer were included +in the result (if the region queried for stopped at that position). +The same was not the case if the buffer had been narrowed to exclude +the real end of the buffer. This has now been changed, and +zero-length overlays at 'point-max' are always included in the results. + +--- +** 'replace-match' now runs modification hooks slightly later. +The function is documented to leave point after the replacement text, +but this was not always the case if a modification hook inserted text +in front of the replaced text -- 'replace-match' would instead leave +point where the end of the inserted text would have been before the +hook ran. 'replace-match' now always leaves point after the +replacement text. + ++++ +** 'completing-read-default' sets completion variables buffer-locally. +'minibuffer-completion-table' and related variables are now set buffer-locally +in the minibuffer instead of being set via a global let-binding. + +--- +** XML serialization functions now reject invalid characters. +Previously, 'xml-print' would produce invalid XML when given a string +with characters that are not valid in XML (see +https://www.w3.org/TR/xml/#charsets). Now it rejects such strings. + +--- +** JSON + +--- +*** JSON number parsing is now stricter. +Numbers with a leading plus sign, leading zeros, or a missing integer +component are now rejected by 'json-read' and friends. This makes +them more compliant with the JSON specification and consistent with +the native JSON parsing functions. + +--- +*** JSON functions support the semantics of RFC 8259. +The JSON functions 'json-serialize', 'json-insert', +'json-parse-string', and 'json-parse-buffer' now implement some of the +semantics of RFC 8259 instead of the earlier RFC 4627. In particular, +these functions now accept top-level JSON values that are neither +arrays nor objects. + +--- +*** Some JSON encoding functions are now obsolete. +The functions 'json-encode-number', 'json-encode-hash-table', +'json-encode-key', and 'json-encode-list' are now obsolete. + +The first two are kept as aliases of 'json-encode', which should be +used instead. Uses of 'json-encode-list' should be changed to call +one of 'json-encode', 'json-encode-alist', 'json-encode-plist', or +'json-encode-array' instead. + ++++ +*** Native JSON functions now signal an error if libjansson is unavailable. +This affects 'json-serialize', 'json-insert', 'json-parse-string', +and 'json-parse-buffer'. This can happen if Emacs was compiled with +libjansson, but the DLL cannot be found and/or loaded by Emacs at run +time. Previously, Emacs would display a message and return nil in +these cases. + ++++ +** The use of positional arguments in 'define-minor-mode' is obsolete. +These were actually rendered obsolete in Emacs 21 but were never +marked as such. + +--- +** 'pcomplete-ignore-case' is now an obsolete alias of 'completion-ignore-case'. + ++++ +** 'completions-annotations' face is not used when the caller puts own face. +This affects the suffix specified by completion 'annotation-function'. + ++++ +** An active minibuffer now has major mode 'minibuffer-mode'. +This is instead of the erroneous 'minibuffer-inactive-mode' it +formerly had. + +--- +** 'make-text-button' no longer modifies text properties of its first argument. +When its first argument is a string, 'make-text-button' no longer +modifies the string's text properties; instead, it uses and returns +a copy of the string. This helps avoid trouble when strings are +shared or constants. + ++++ +** Some properties from completion tables are now preserved. +If 'minibuffer-allow-text-properties' is non-nil, doing completion +over a table of strings with properties will no longer remove all the +properties before returning. This affects things like 'completing-read'. + +--- +** 'dns-query' now consistently uses Lisp integers to represent integers. +Formerly it made an exception for integer components of SOA records, +because SOA serial numbers can exceed fixnum ranges on 32-bit platforms. +Emacs now supports bignums so this old glitch is no longer needed. + ++++ +** The '&define' keyword in an Edebug specification now disables backtracking. +The implementation was buggy, and multiple '&define' forms in an '&or' +form should be exceedingly rare. See the Info node "(elisp) Backtracking" in +the Emacs Lisp reference manual for background. + ++++ +** The error 'ftp-error' belongs also to category 'remote-file-error'. + ++++ +** The WHEN argument of 'make-obsolete' and related functions is mandatory. +The use of those functions without a WHEN argument was marked obsolete +back in Emacs 23.1. The affected functions are: 'make-obsolete', +'define-obsolete-function-alias', 'make-obsolete-variable', +'define-obsolete-variable-alias'. + ++++ +** 'inhibit-nul-byte-detection' is renamed to 'inhibit-null-byte-detection'. + +--- +** Some functions are no longer considered safe by 'unsafep': +'replace-regexp-in-string', 'catch', 'throw', 'error', 'signal' +and 'play-sound-file'. + +--- +** 'sql-*-statement-starters' are no longer user options. +These variables describe facts about the SQL standard and +product-specific additions. There should be no need for users to +customize them. + +--- +** Some locale-related variables have been removed. +The Lisp variables 'previous-system-messages-locale' and +'previous-system-time-locale' have been removed, as they were created +by mistake and were not useful to Lisp code. + +--- +** Function 'lm-maintainer' is replaced with 'lm-maintainers'. +The former is now declared obsolete. + ++++ +** facemenu.el is no longer preloaded. +To use functions/variables from the package, you now have to say +'(require 'facemenu)' or similar. + +--- +** 'facemenu-color-alist' is now obsolete, and is not used. + +--- +** The variable 'keyboard-type' is obsolete and not dynamically scoped any more. + ++++ +** The 'values' variable is now obsolete. +Using it just contributes to the growth of the Emacs memory +footprint. + +--- +** The 'load-dangerous-libraries' variable is now obsolete. +It was used to allow loading Lisp libraries compiled by XEmacs, a +modified version of Emacs which is no longer actively maintained. +This is no longer supported, and setting this variable has no effect. + ++++ +** The macro 'with-displayed-buffer-window' is now obsolete. +Use macro 'with-current-buffer-window' with action alist entry 'body-function'. + +--- +** The rfc2368.el library is now obsolete. +Use rfc6068.el instead. The main difference is that +'rfc2368-parse-mailto-url' and 'rfc2368-unhexify-string' assumed that +the strings were all-ASCII, while 'rfc6068-parse-mailto-url' and +'rfc6068-unhexify-string' parse UTF-8 strings. + +--- +** The inversion.el library is now obsolete. + +--- +** The metamail.el library is now obsolete. + +** Edebug changes + +--- +*** 'get-edebug-spec' is obsolete, replaced by 'edebug-get-spec'. + ++++ +*** The spec operator ':name NAME' is obsolete, use '&name' instead. + ++++ +*** The spec element 'function-form' is obsolete, use 'form' instead. + ++++ +*** New function 'def-edebug-elem-spec' to define Edebug spec elements. +These used to be defined with 'def-edebug-spec' thus conflating the +two name spaces, which lead to name collisions. +The use of 'def-edebug-spec' to define Edebug spec elements is +declared obsolete. + +--- +** The sb-image.el library is now obsolete. +This was a compatibility kludge which is no longer needed. + +--- +** Some libraries obsolete since Emacs 23 have been removed: +ledit.el, lmenu.el, lucid.el and old-whitespace.el. + +--- +** Some functions and variables obsolete since Emacs 23 have been removed: +'GOLD-map', 'advertised-xscheme-send-previous-expression', +'allout-init', 'bookmark-jump-noselect', +'bookmark-read-annotation-text-func', 'buffer-menu-mode-hook', +'c-forward-into-nomenclature', 'char-coding-system-table', +'char-valid-p', 'charset-bytes', 'charset-id', 'charset-list', +'choose-completion-delete-max-match', 'complete-in-turn', +'completion-base-size', 'completion-common-substring', +'crm-minibuffer-complete', 'crm-minibuffer-complete-and-exit', +'crm-minibuffer-completion-help', 'custom-mode', 'custom-mode-hook', +'define-key-rebound-commands', 'define-mode-overload-implementation', +'detect-coding-with-priority', 'dirtrack-debug', +'dirtrack-debug-toggle', 'dynamic-completion-table', +'easy-menu-precalculate-equivalent-keybindings', +'epa-display-verify-result', 'epg-passphrase-callback-function', +'erc-announced-server-name', 'erc-default-coding-system', +'erc-process', 'erc-send-command', 'eshell-report-bug', +'eval-next-after-load', 'exchange-dot-and-mark', 'ffap-bug', +'ffap-submit-bug', 'ffap-version', 'file-cache-mouse-choose-completion', +'forward-point', 'generic-char-p', 'global-highlight-changes', +'hi-lock-face-history', 'hi-lock-regexp-history', +'highlight-changes-active-string', 'highlight-changes-initial-state', +'highlight-changes-passive-string', +'icalendar--datetime-to-noneuropean-date', 'image-mode-maybe', +'imenu-example--name-and-position', 'ispell-aspell-supports-utf8', +'lisp-mode-auto-fill', 'locate-file-completion', 'make-coding-system', +'menu-bar-files-menu', 'minibuffer-local-must-match-filename-map', +'mouse-choose-completion', 'mouse-major-mode-menu', +'mouse-popup-menubar', 'mouse-popup-menubar-stuff', +'newsticker-groups-filename', 'nnir-swish-e-index-file', +'nnmail-fix-eudora-headers', 'non-iso-charset-alist', +'nonascii-insert-offset', 'nonascii-translation-table', +'password-read-and-add', 'pre-abbrev-expand-hook', 'princ-list', +'print-help-return-message', 'process-filter-multibyte-p', +'read-file-name-predicate', 'remember-buffer', 'rmail-highlight-face', +'rmail-message-filter', 'semantic-after-idle-scheduler-reparse-hooks', +'semantic-after-toplevel-bovinate-hook', +'semantic-before-idle-scheduler-reparse-hooks', +'semantic-before-toplevel-bovination-hook', +'semantic-bovinate-from-nonterminal-full', +'semantic-bovinate-region-until-error', 'semantic-bovinate-toplevel', +'semantic-bovination-working-type', +'semantic-decorate-pending-decoration-hooks', +'semantic-edits-incremental-reparse-failed-hooks', +'semantic-eldoc-current-symbol-info', 'semantic-expand-nonterminal', +'semantic-file-token-stream', 'semantic-find-dependency', +'semantic-find-nonterminal', 'semantic-flex', 'semantic-flex-buffer', +'semantic-flex-keyword-get', 'semantic-flex-keyword-p', +'semantic-flex-keyword-put', 'semantic-flex-keywords', +'semantic-flex-list', 'semantic-flex-make-keyword-table', +'semantic-flex-map-keywords', 'semantic-flex-token-end', +'semantic-flex-token-start', 'semantic-flex-token-text', +'semantic-imenu-bucketize-type-parts', +'semantic-imenu-expand-type-parts', 'semantic-imenu-expandable-token', +'semantic-init-db-hooks', 'semantic-init-hooks', +'semantic-init-mode-hooks', 'semantic-java-prototype-nonterminal', +'semantic-nonterminal-abstract', 'semantic-nonterminal-full-name', +'semantic-nonterminal-leaf', 'semantic-nonterminal-protection', +'semantic-something-to-stream', 'semantic-tag-make-assoc-list', +'semantic-token-type-parent', 'semantic-toplevel-bovine-cache', +'semantic-toplevel-bovine-table', 'semanticdb-mode-hooks', +'set-coding-priority', 'set-process-filter-multibyte', +'shadows-compare-text-p', 'shell-dirtrack-toggle', +'speedbar-navigating-speed', 'speedbar-update-speed', 't-mouse-mode', +'term-dynamic-simple-complete', 'tooltip-hook', 'tpu-have-ispell', +'url-generate-unique-filename', 'url-temporary-directory', +'vc-arch-command', 'vc-default-working-revision' (variable), +'vc-mtn-command', 'vc-revert-buffer', 'vc-workfile-version', +'vcursor-toggle-vcursor-map', 'w32-focus-frame', 'w32-select-font', +'wisent-lex-make-token-table'. + +--- +** Some functions and variables obsolete since Emacs 22 have been removed: +'erc-current-network', 'gnus-article-hide-pgp-hook', +'gnus-inews-mark-gcc-as-read', 'gnus-treat-display-xface', +'gnus-treat-strip-pgp', 'nnmail-spool-file'. + +--- +** The obsolete function 'thread-alive-p' has been removed. + +--- +** The variable 'force-new-style-backquotes' has been removed. +This removes the final remaining trace of old-style backquotes. + +--- +** Some obsolete variable and function aliases in dbus.el have been removed. +In Emacs 24.3, the variable 'dbus-event-error-hooks' was renamed to +'dbus-event-error-functions' and the function +'dbus-call-method-non-blocking' was renamed to 'dbus-call-method'. +The old names, which were kept as obsolete aliases of the new names, +have now been removed. + +--- +** 'find-function-source-path' renamed and re-documented. +The 'find-function' command (and various related commands) were +documented to respect 'find-function-source-path', and to search for +objects in files specified by that variable. It's unclear when this +actually changed, but at some point (perhaps decades ago) these +commands started using 'load-history' to determine where symbols had +been defined (which is much faster). The doc strings of all the +affected function have been updated. 'find-function-source-path' was +still being used by 'find-library' and related commands, so the +user option has been renamed to 'find-library-source-path', and +'find-function-source-path' is now an obsolete variable alias. + +--- +** The macro 'vc-call' no longer evaluates its second argument twice. + + +* Lisp Changes in Emacs 28.1 + ++++ +** The 'interactive' syntax has been extended to allow listing applicable modes. +Forms like '(interactive "p" dired-mode)' can be used to annotate the +commands as being applicable for modes derived from 'dired-mode', +or if the mode is a minor mode, when the current buffer has that +minor mode activated. Note that using this form will create byte code +that is not compatible with byte code in previous Emacs versions. + ++++ +** New forms to declare how completion should happen has been added. +'(declare (completion PREDICATE))' can be used as a general predicate +to say whether the command should be present when completing with +'M-x TAB'. '(declare (modes MODE...))' can be used as a short-hand +way of saying that the command should be present when completing from +buffers in major modes derived from MODE..., or, if it's a minor mode, +when that minor mode is enabled in the current buffer. + ++++ +** 'define-minor-mode' now takes an ':interactive' argument. +This can be used for specifying which modes this minor mode is meant +for, or to make the new minor mode non-interactive. The default value +is t. + ++++ +** 'define-derived-mode' now takes an ':interactive' argument. +This can be used to control whether the defined mode is a command +or not, and is useful when defining commands that aren't meant to be +used by users directly. + ++++ +** 'define-globalized-minor-mode' now takes a ':predicate' parameter. +This can be used to control which major modes the minor mode should be +used in. + ++++ +** 'condition-case' now allows for a success handler. +It is written as '(:success BODY...)' where BODY is executed +whenever the protected form terminates without error, with the +specified variable bound to the value of the protected form. + ++++ +** New function 'benchmark-call' to measure the execution time of a function. +Additionally, the number of repetitions can be expressed as a minimal duration +in seconds. + ++++ +** The value thrown to the 'exit' label can now be a function. +This is in addition to values t or nil. If the value is a function, +the command loop will call it with zero arguments before returning. + ++++ +** The behavior of 'format-spec' is now closer to that of 'format'. +In order for the two functions to behave more consistently, +'format-spec' now pads and truncates based on string width rather than +length, and also supports format specifications that include a +truncating precision field, such as "%.2a". + +--- +** 'defvar' detects the error of defining a variable currently lexically bound. +Such mixes are always signs that the outer lexical binding was an +error and should have used dynamic binding instead. + +--- +** New variable 'inhibit-mouse-event-check'. +If bound to non-nil, a command with '(interactive "e")' doesn't signal +an error when invoked by input event that is not a mouse click (e.g., +a key sequence). + +--- +** New variable 'redisplay-skip-initial-frame' to enable batch redisplay tests. +Setting it to nil forces the redisplay to do its job even in the +initial frame used in batch mode. + ++++ +** Doc strings can now link to customization groups. +Text like "customization group `whitespace'" will be made into a +button. When clicked, it will open a Custom buffer displaying that +customization group. + ++++ +** Doc strings can now link to man pages. +Text like "man page `chmod(1)'" will be made into a button. When +clicked, it will open a Man mode buffer displaying that man page. + ++++ +** Buffers can now be created with certain hooks disabled. +The functions 'get-buffer-create' and 'generate-new-buffer' accept a +new optional argument INHIBIT-BUFFER-HOOKS. If non-nil, the new +buffer does not run the hooks 'kill-buffer-hook', +'kill-buffer-query-functions', and 'buffer-list-update-hook'. This +avoids slowing down internal or temporary buffers that are never +presented to users or passed on to other applications. + ++++ +** New command 'make-directory-autoloads'. +This does the same as the old command 'update-directory-autoloads', +but has different semantics: Instead of passing in the output file via +the dynamically bound 'generated-autoload-file' variable, the output +file is now a explicit parameter. + +--- +** Dragging a file into Emacs pushes the file name onto 'file-name-history'. + +--- +** The 'easymenu' library is now preloaded. + +--- +** The 'iso-transl' library is now preloaded. +This means that keystrokes like 'Alt-[' are defined by default, +instead of only becoming available after doing (for instance) +'C-x 8 '. + +--- +** ':safe' settings in 'defcustom' are now propagated to the loaddefs files. + ++++ +** New ':type' for 'defcustom' for nonnegative integers. +The new 'natnum' type can be used for options that should be +nonnegative integers. + ++++ +** ERT can now output more verbose test failure reports. +If the 'EMACS_TEST_VERBOSE' environment variable is set, failure +summaries will include the failing condition. + +** Byte compiler changes + ++++ +*** New byte-compiler check for missing dynamic variable declarations. +It is meant as an (experimental) aid for converting Emacs Lisp code +to lexical binding, where dynamic (special) variables bound in one +file can affect code in another. For details, see the manual section +"(elisp) Converting to Lexical Binding". + ++++ +*** 'byte-recompile-directory' can now compile symlinked ".el" files. +This is achieved by giving a non-nil FOLLOW-SYMLINKS parameter. + +--- +*** The byte-compiler now warns about too wide documentation strings. +By default, it will warn if a documentation string is wider than the +largest of 'byte-compile-docstring-max-column' or 'fill-column' +characters. + ++++ +*** 'byte-compile-file' optional argument LOAD is now obsolete. +To load the file after byte-compiling, add a call to 'load' from Lisp +or use 'M-x emacs-lisp-byte-compile-and-load' interactively. + +** Macroexp + +--- +*** New function 'macroexp-file-name' to know the name of the current file. + +--- +*** New function 'macroexp-compiling-p' to know if we're compiling. + +--- +*** New function 'macroexp-warn-and-return' to help emit warnings. +This used to be named 'macroexp--warn-and-return' and has proved useful +and well-behaved enough to lose the "internal" marker. + +** map.el + +--- +*** Alist keys are now consistently compared with 'equal' by default. +Until now, 'map-elt' and 'map-delete' compared alist keys with 'eq' by +default. They now use 'equal' instead, for consistency with +'map-put!' and 'map-contains-key'. + +*** Pcase 'map' pattern added keyword symbols abbreviation. +A pattern like '(map :sym)' binds the map's value for ':sym' to 'sym', +equivalent to '(map (:sym sym))'. + +--- +*** The function 'map-copy' now uses 'copy-alist' on alists. +This is a slightly deeper copy than the previous 'copy-sequence'. + +--- +*** The function 'map-contains-key' now supports plists. + +--- +*** More consistent duplicate key handling in 'map-merge-with'. +Until now, 'map-merge-with' promised to call its function argument +whenever multiple maps contained 'eql' keys. However, this did not +always coincide with the keys that were actually merged, which could +be 'equal' instead. The function argument is now called whenever keys +are merged, for greater consistency with 'map-merge' and 'map-elt'. + +** pcase + ++++ +*** The 'or' pattern now binds the union of the vars of its sub-patterns. +If a variable is not bound by the subpattern that matched, it gets bound +to nil. This was already sometimes the case, but it is now guaranteed. + ++++ +*** The 'pred' pattern can now take the form '(pred (not FUN))'. +This is like '(pred (lambda (x) (not (FUN x))))' but results +in better code. + +--- +*** New function 'pcase-compile-patterns' to write other macros. + ++++ +*** Added 'cl-type' pattern. +The new 'cl-type' pattern compares types using 'cl-typep', which allows +comparing simple types like '(cl-type integer)', as well as forms like +'(cl-type (integer 0 10))'. + ++++ +*** New macro 'pcase-setq'. +This macro is the 'setq' equivalent of 'pcase-let', which allows for +destructuring patterns in a 'setq' form. + +** Edebug + +*** Edebug specification lists can use some new keywords: + ++++ +**** '&interpose SPEC FUN ARGS..' lets FUN control parsing after SPEC. +More specifically, FUN is called with 'HEAD PF ARGS..' where +PF is a parsing function that expects a single argument (the specs to +use) and HEAD is the code that matched SPEC. + ++++ +**** '&error MSG' unconditionally aborts the current edebug instrumentation. + ++++ +**** '&name SPEC FUN' extracts the current name from the code matching SPEC. + +** Dynamic modules changes + ++++ +*** Type aliases for module functions and finalizers. +The module header 'emacs-module.h' now contains type aliases +'emacs_function' and 'emacs_finalizer' for module functions and +finalizers, respectively. + ++++ +*** Module functions can now be made interactive. +Use 'make_interactive' to give a module function an interactive +specification. + ++++ +*** Module functions can now install an optional finalizer. +The finalizer is called when the function object is garbage-collected. +Use 'set_function_finalizer' to set the finalizer and +'get_function_finalizer' to retrieve it. + ++++ +*** Modules can now open a channel to an existing pipe process. +Modules can use the new module function 'open_channel' to do that. +On capable systems, modules can use this functionality to +asynchronously send data back to Emacs. + ++++ +*** A new module API 'make_unibyte_string'. +It can be used to create Lisp strings with arbitrary byte sequences +(a.k.a. "raw bytes"). + ++++ +** Shorthands for Lisp symbols. +Shorthands are a general purpose namespacing system to make Emacs +Lisp's symbol-naming etiquette easier to use. A shorthand is any +symbolic form found in Lisp source that "abbreviates" a symbol's print +name. Among other applications, this feature can be used to avoid +name clashes and namespace pollution by renaming an entire file's +worth of symbols with proper and longer prefixes, without actually +touching the Lisp source. For details, see the manual section +"(elisp) Shorthands". + ++++ +** New function 'string-search'. +This function takes two string parameters and returns the position of +the first instance of the former string in the latter. + ++++ +** New function 'string-replace'. +This function works along the line of 'replace-regexp-in-string', but +it matches on fixed strings instead of regexps, and does not change +the global match state. + ++++ +** New function 'ensure-list'. +This function makes a list of its object if it's not a list already. +If it's already a list, the list is returned as is. + ++++ +** New function 'split-string-shell-command'. +This splits a shell command string into separate components, +respecting quoting with single ('like this') and double ("like this") +quotes, as well as backslash quoting (like\ this). + ++++ +** New function 'string-clean-whitespace'. +This removes whitespace from a string. + ++++ +** New function 'string-fill'. +Word-wrap a string so that no lines are longer that a specific length. + ++++ +** New function 'string-limit'. +Return (up to) a specific substring length. + ++++ +** New function 'string-lines'. +Return a list of strings representing the individual lines in a +string. + ++++ +** New function 'string-pad'. +Pad a string to a specific length. + ++++ +** New function 'string-chop-newline'. +Remove a trailing newline from a string. + ++++ +** New function 'replace-regexp-in-region'. + ++++ +** New function 'replace-string-in-region'. + ++++ +** New function 'file-name-with-extension'. +This function allows a canonical way to set/replace the extension of a +file name. + ++++ +** New function 'file-modes-number-to-symbolic' to convert a numeric +file mode specification into symbolic form. + ++++ +** New function 'file-name-concat'. +This appends file name components to a directory name and returns the +result. + ++++ +** New function 'file-backup-file-names'. +This function returns the list of file names of all the backup files +for the specified file. + ++++ +** New function 'directory-empty-p'. +This predicate tests whether a given file name is an accessible +directory and whether it contains no other directories or files. + ++++ +** New function 'buffer-local-boundp'. +This predicate says whether a symbol is bound in a specific buffer. + ++++ +** New function 'always'. +This is identical to 'ignore', but returns t instead. + ++++ +** New function 'sxhash-equal-including-properties'. +This is identical to 'sxhash-equal' but also accounts for string +properties. + +--- +** New function 'buffer-line-statistics'. +This function returns some statistics about the line lengths in a buffer. + +--- +** New function 'color-values-from-color-spec'. +This can be used to parse RGB color specs in several formats and +convert them to a list '(R G B)' of primary color values. + +--- +** New function 'custom-add-choice'. +This function can be used by modes to add elements to the +'choice' customization type of a variable. + +--- +** New function 'decoded-time-period'. +It interprets a decoded time structure as a period and returns the +equivalent period in seconds. + ++++ +** New function 'dom-print'. + ++++ +** New function 'dom-remove-attribute'. + +--- +** New function 'dns-query-asynchronous'. +It takes the same parameters as 'dns-query', but adds a callback +parameter. + +** New function 'garbage-collect-maybe' to trigger GC early. + +--- +** New function 'get-locale-names'. +This utility function returns a list of names of locales available on +the current system. + ++++ +** New function 'insert-into-buffer'. +This inserts the contents of the current buffer into another buffer. + ++++ +** New function 'json-available-p'. +This predicate returns non-nil if Emacs is built with libjansson +support, and it is available on the current system. + +--- +** New function 'mail-header-parse-addresses-lax'. +This takes a comma-separated string and returns a list of mail/name +pairs. + +--- +** New function 'mail-header-parse-address-lax'. +Parse a string as a mail address-like string. + +--- +** New function 'make-separator-line'. +Make a string appropriate for usage as a visual separator line. + ++++ +** New function 'num-processors'. +Return the number of processors on the system. + ++++ +** New function 'object-intervals'. +This function returns a copy of the list of intervals (i.e., text +properties) in the object in question (which must either be a string +or a buffer). + ++++ +** New function 'process-lines-ignore-status'. +This is like 'process-lines', but does not signal an error if the +return status is non-zero. 'process-lines-handling-status' has also +been added, and takes a callback to handle the return status. + ++++ +** New function 'require-theme'. +This function is like 'require', but searches 'custom-theme-load-path' +instead of 'load-path'. It can be used by Custom themes to load +supporting Lisp files when 'require' is unsuitable. + ++++ +** New function 'seq-union'. +This function takes two sequences and returns a list of all elements +that appear in either of them, with no two elements that compare equal +appearing in the result. + ++++ +** New function 'syntax-class-to-char'. +This does almost the opposite of 'string-to-syntax' -- it returns the +syntax descriptor (a character) given a raw syntax descriptor (an +integer). + ++++ +** New functions 'null-device' and 'path-separator'. +These functions return the connection local value of the respective +variables. This can be used for remote hosts. + ++++ +** New predicate functions 'length<', 'length>' and 'length='. +Using these functions may be more efficient than using 'length' (if +the length of a (long) list is being computed just to compare this +length to a number). + ++++ +** New macro 'dlet' to dynamically bind variables. + ++++ +** New macro 'with-existing-directory'. +This macro binds 'default-directory' to some other existing directory +if 'default-directory' doesn't exist, and then executes the body forms. + ++++ +** New variable 'current-minibuffer-command'. +This is like 'this-command', but it is bound recursively when entering +the minibuffer. + ++++ +** New variable 'inhibit-interaction' to make user prompts signal an error. +If this is bound to something non-nil, functions like +'read-from-minibuffer', 'read-char' (and related) will signal an +'inhibited-interaction' error. + +--- +** New variable 'indent-line-ignored-functions'. +This allows modes to cycle through a set of indentation functions +appropriate for those modes. + ++++ +** New variable 'print-integers-as-characters' modifies integer printing. +If this variable is non-nil, character syntax is used for printing +numbers when this makes sense, such as '?A' for 65. + ++++ +** New variable 'tty-menu-calls-mouse-position-function'. +This controls whether 'mouse-position-function' is called by functions +that retrieve the mouse position when that happens during TTY menu +handling. Lisp programs that set 'mouse-position-function' should +also set this variable non-nil if they are compatible with the tty +menu handling. + ++++ +** New variables that hold default buffer names for shell output. +The new constants 'shell-command-buffer-name' and +'shell-command-buffer-name-async' store the default buffer names +for the output of, respectively, synchronous and async shell +commands. + +--- +** New variables 'read-char-choice-use-read-key' and 'y-or-n-p-use-read-key'. +When non-nil, then functions 'read-char-choice' and 'y-or-n-p' +(respectively) use the function 'read-key' to read a character instead +of using the minibuffer. + ++++ +** New variable 'global-minor-modes'. +This variable holds a list of currently enabled global minor modes (as +a list of symbols). + ++++ +** New buffer-local variable 'local-minor-modes'. +This permanently buffer-local variable holds a list of currently +enabled non-global minor modes in the current buffer (as a list of +symbols). + ++++ +** New completion function 'affixation-function' to add prefix/suffix. +It accepts a list of completions and should return a list where +each element is a list with three elements: a completion, +a prefix string, and a suffix string. + ++++ +** New completion function 'group-function' for grouping candidates. +It takes two arguments: a completion candidate and a 'transform' flag. + ++++ +** New error symbol 'minibuffer-quit'. +Signaling it has almost the same effect as 'quit' except that it +doesn't cause keyboard macro termination. + ++++ +** New error 'remote-file-error', a subcategory of 'file-error'. +It is signaled if a remote file operation fails due to internal +reasons, and could block Emacs. It does not replace 'file-error' +signals for the usual cases. Timers, process filters and process +functions, which run remote file operations, shall protect themselves +against this error. + +If such an error occurs, please report this as bug via 'M-x report-emacs-bug'. +Until it is solved you could ignore such errors by performing + + (setq debug-ignored-errors (cons 'remote-file-error debug-ignored-errors)) + ++++ +** New macro 'named-let' added to subr-x.el. +It provides Scheme's "named let" looping construct. + +--- +** Emacs now attempts to test for high-rate subprocess output more fairly. +When several subprocesses produce output simultaneously at high rate, +Emacs will now by default attempt to service them all in a round-robin +fashion. Set the new variable 'process-prioritize-lower-fds' to a +non-nil value to get back the old behavior, whereby after reading +from a subprocess, Emacs would check for output of other subprocesses +in a way that is likely to read from the same process again. + ++++ +** 'set-process-buffer' now updates the process mark. +The mark will be set to point to the end of the new buffer. + ++++ +** 'unlock-buffer' displays warnings instead of signaling. +Instead of signaling 'file-error' conditions for file system level +errors, the function now calls 'display-warning' and continues as if +the error did not occur. + ++++ +** 'read-char-from-minibuffer' and 'y-or-n-p' support 'help-form'. +If you bind 'help-form' to a non-nil value while calling these functions, +then pressing 'C-h' ('help-char') causes the function to evaluate 'help-form' +and display the result. + ++++ +** 'read-number' now has its own history variable. +Additionally, the function now accepts a HIST argument which can be +used to specify a custom history variable. + ++++ +** 'set-window-configuration' now takes two optional parameters, +'dont-set-frame' and 'dont-set-miniwindow'. The first of these, when +non-nil, instructs the function not to select the frame recorded in +the configuration. The second prevents the current minibuffer being +replaced by the one stored in the configuration. + +--- +** 'count-windows' now takes an optional parameter ALL-FRAMES. +The semantics are as with 'walk-windows'. + ++++ +** 'truncate-string-ellipsis' now uses '…' by default. +Modes that use 'truncate-string-to-width' with non-nil, non-string +argument ELLIPSIS, will now indicate truncation using '…' when +the selected frame can display it, and using "..." otherwise. + ++++ +** 'string-width' now accepts two optional arguments FROM and TO. +This allows calculating the width of a substring without consing a +new string. + ++++ +** 'directory-files' now takes an additional COUNT parameter. +The parameter makes 'directory-files' return COUNT first file names +from a directory. If MATCH is also given, the function will return +first COUNT file names that match the expression. The same COUNT +parameter has been added to 'directory-files-and-attributes'. + ++++ +** 'count-lines' can now ignore invisible lines. +This is controlled by the optional parameter IGNORE-INVISIBLE-LINES. + +--- +** 'count-words' now crosses field boundaries. +Originally, 'count-words' would stop counting at the first field +boundary it encountered; now it keeps counting all the way to the +region's (or buffer's) end. + ++++ +** File-related APIs can optionally follow symlinks. +The functions 'file-modes', 'set-file-modes', and 'set-file-times' now +have an optional argument specifying whether to follow symbolic links. + ++++ +** 'format-seconds' can now be used for sub-second times. +The new optional "," parameter has been added, and +'(format-seconds "%mm %,1ss" 66.4)' will now result in "1m 6.4s". + ++++ +** 'parse-time-string' can now parse ISO 8601 format strings. +These have a format like "2020-01-15T16:12:21-08:00". + +--- +** 'lookup-key' is more allowing when searching for extended menu items. +When looking for a menu item '[menu-bar Foo-Bar]', first try to find +an exact match, then look for the lowercased '[menu-bar foo-bar]'. +It will only try to downcase ASCII characters in the range "A-Z". +This improves backwards-compatibility when converting menus to use +'easy-menu-define'. + +--- +** 'make-network-process', 'make-serial-process' ':coding' behavior change. +Previously, passing ':coding nil' to either of these functions would +override any non-nil binding for 'coding-system-for-read' and +'coding-system-for-write'. For consistency with 'make-process' and +'make-pipe-process', passing ':coding nil' is now ignored. No code in +Emacs depended on the previous behavior; if you really want the +process' coding-system to be nil, use 'set-process-coding-system' +after the process has been created, or pass in ':coding '(nil nil)'. + ++++ +** 'open-network-stream' now accepts a ':coding' argument. +This allows specifying the coding systems used by a network process +for encoding and decoding without having to bind +'coding-system-for-{read,write}' or call 'set-process-coding-system'. + ++++ +** 'open-network-stream' can now take a ':capability-command' that's a function. +The function is called with the greeting from the server as its only +parameter, and allows sending different TLS capability commands to the +server based on that greeting. + ++++ +** 'open-gnutls-stream' now also accepts a ':coding' argument. + +--- +** 'process-attributes' now works under OpenBSD, too. + ++++ +** 'format-spec' now takes an optional SPLIT parameter. +If non-nil, 'format-spec' will split the resulting string into a list +of strings, based on where the format specs (and expansions) were. + +--- +** 'unload-feature' now also tries to undo additions to buffer-local hooks. + +--- +** 'while-no-input-ignore-events' accepts more special events. +The special events 'dbus-event' and 'file-notify' are now ignored in +'while-no-input' when added to this variable. + +--- +** 'start-process-shell-command' and 'start-file-process-shell-command' +do not support the old calling conventions any longer. + ++++ +** 'yes-or-no-p' and 'y-or-n-p' PROMPT parameter no longer needs trailing space. +In other words, the prompt can now end with "?" instead of "? ". This +has been the case since Emacs 24.4 but was not announced or documented +until now. (Checkdoc has also been updated to accept this convention.) + ++++ +** The 'uniquify' argument in 'auto-save-file-name-transforms' can be a symbol. +If this symbol is one of the members of 'secure-hash-algorithms', +Emacs constructs the nondirectory part of the auto-save file name by +applying that 'secure-hash' to the buffer file name. This avoids any +risk of excessively long file names. + ++++ +** New user option 'process-file-return-signal-string'. +It controls, whether 'process-file' returns a string when a remote +process is interrupted by a signal. + +** EIEIO Changes + ++++ +*** The macro 'oref-default' can now be used with 'setf'. +It is now defined as a generalized variable that can be used with +'setf' to modify the value stored in a given class slot. + +--- +*** 'form' in '(eql form)' specializers in 'cl-defmethod' is now evaluated. +This corresponds to the behavior of defmethod in Common Lisp Object System. +For compatibility, '(eql SYMBOL)' does not evaluate SYMBOL, for now. + +** D-Bus + ++++ +*** Property values can be typed explicitly. +'dbus-register-property' and 'dbus-set-property' accept now optional +type symbols. Both functions propagate D-Bus errors. + ++++ +*** Registered properties can have the new access type ':write'. + ++++ +*** In case of problems, handlers can emit proper D-Bus error messages now. + ++++ +*** D-Bus errors, which have been converted from incoming D-Bus error +messages, contain the error name of that message now. + ++++ +*** D-Bus messages can be monitored with the new command 'dbus-monitor'. + ++++ +*** D-Bus events have changed their internal structure. +They carry now the destination and the error-name of an event. They +also keep the type information of their arguments. Use the +'dbus-event-*' accessor functions. + +** Buttons + ++++ +*** New minor mode 'button-mode'. +This minor mode does nothing except install 'button-buffer-map' as +a minor mode map (which binds the 'TAB' / 'S-TAB' key bindings to navigate +to buttons), and can be used in any view-mode-like buffer that has +buttons in it. + ++++ +*** New utility function 'button-buttonize'. +This function takes a string and returns a string propertized in a way +that makes it a valid button. + +--- +** 'text-scale-mode' can now adjust font size of the header line. +When the new buffer local variable 'text-scale-remap-header-line' +is non-nil, 'text-scale-adjust' will also scale the text in the header +line when displaying that buffer. + +This is useful for major modes that arrange their display in a tabular +form below the header line. It is enabled by default in +'tabulated-list-mode' and its derived modes, and disabled by default +elsewhere. + +--- +** 'ascii' is now a coding system alias for 'us-ascii'. + +--- +** New coding-systems for EBCDIC variants. +New coding-systems 'ibm256', 'ibm273', 'ibm274', 'ibm277', 'ibm278', +'ibm280', 'ibm281', 'ibm284', 'ibm285', 'ibm290', 'ibm297'. These are +variants of the EBCDIC encoding tailored to some European and Japanese +locales. They are also available as aliases 'ebcdic-cp-*' (e.g., +'ebcdic-cp-fi' for the Finnish variant 'ibm278'), and 'cp2xx' (e.g., +'cp278' for 'ibm278'). There are also new charsets 'ibm2xx' to +support these coding-systems. + ++++ +** New 'Bindat type expression' description language. +This new system is provided by the new macro 'bindat-type' and +obsoletes the old data layout specifications. It supports +arbitrary-size integers, recursive types, and more. See the Info node +"(elisp) Byte Packing" in the ELisp manual for more details. + ++++ +** New macro 'with-environment-variables'. +This macro allows setting environment variables temporarily when +executing a form. + + +* Changes in Emacs 28.1 on Non-Free Operating Systems + ++++ +** On MS-Windows, Emacs can now use the native image API to display images. +Emacs can now use the MS-Windows GDI+ library to load and display +images in JPEG, PNG, GIF and TIFF formats. This support is available +unless Emacs was configured '--without-native-image-api'. + +This feature is experimental, and needs to be turned on to be used. +To turn this on, set the variable 'w32-use-native-image-API' to a +non-nil value. Please report any bugs you find while using the native +image API via 'M-x report-emacs-bug'. + ++++ +** On MS-Windows, Emacs can now toggle the IME. +A new function 'w32-set-ime-open-status' can now be used to disable +and enable the MS-Windows native Input Method Editor (IME) at run +time. A companion function 'w32-get-ime-open-status' returns the +current IME activation status. + +-- +** On macOS, 's-' and 's-' are now bound to +'move-beginning-of-line' and 'move-end-of-line' respectively. The commands +to select previous/next frame are still bound to 's-~' and 's-`'. + ++++ +** On macOS, Emacs can now load dynamic modules with a ".dylib" suffix. +'module-file-suffix' now has the value ".dylib" on macOS, but the +".so" suffix is supported as well. + +--- +** On macOS, the user option 'make-pointer-invisible' is now honored. + +--- +** On macOS, Xwidget is now supported. +If Emacs was built with xwidget support, you can access the embedded +webkit browser with 'M-x xwidget-webkit-browse-url'. Viewing two +instances of xwidget webkit is not supported. + +--- +*** New user option 'xwidget-webkit-enable-plugins'. +If non-nil, enable plugins in xwidget. (This is only available on +macOS.) + ++++ +** New macOS Contacts back-end for EUDC. +This backend works on newer versions of macOS and is generally +preferred over the eudcb-mab.el backend. + + +---------------------------------------------------------------------- +This file is part of GNU Emacs. + +GNU Emacs is free software: you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation, either version 3 of the License, or +(at your option) any later version. + +GNU Emacs is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Emacs. If not, see . + + +Local variables: +coding: utf-8 +mode: outline +paragraph-separate: "[ ]*$" +end: