Tweak python-hideshow-forward-sexp-function warning avoidance

* lisp/progmodes/python.el
(python-hideshow-forward-sexp-function): Avoid compilation warning
in a more standard way.  Problem reported in
https://thedailywtf.com/articles/the-programmer-s-motto-and-other-comments

Merge branch 'master' of git.sv.gnu.org:/srv/git/emacs

Merge branch 'master' of git.sv.gnu.org:/srv/git/emacs

Avoid crashes due to clearing of a frame's face cache

* src/xfaces.c (clear_face_cache): Don't clear fonts and faces of
a frame that is being redisplayed, just because it's time for some
routine maintenance.  (Bug#50571)
* src/xdisp.c (redisplay_internal):
* src/frame.h (struct frame) <inhibit_clear_image_cache>: Update
commentary of using this struct member.

* lisp/net/tramp-sh.el (tramp-methods): <sudo>: Change template.  (Bug#50594)

Avoid compiler warnings in comp.c on MS-Windows

* src/comp.c (DEF_DLL_FN, init_gccjit_functions): Don't load and
don't define functions/macros if libgccjit doesn't have them, to
avoid compiler warnings.

Faster grep pattern for identifiers

* lisp/cedet/semantic/symref/grep.el (semantic-symref-perform-search):
Use the `-w` flag instead of wrapping the pattern in regexps that make
matching much slower.  This speeds up `xref-find-references` by about
3× on macOS.

Update Unicode support to Unicode version 14.0.0

* admin/unidata/copyright.html:
* admin/unidata/UnicodeData.txt:
* admin/unidata/Blocks.txt:
* admin/unidata/BidiBrackets.txt:
* admin/unidata/BidiMirroring.txt:
* admin/unidata/IVD_Sequences.txt:
* admin/unidata/NormalizationTest.txt:
* admin/unidata/SpecialCasing.txt:
* test/manual/BidiCharacterTest.txt: Updated files from Unicode
14.0.

* lisp/international/fontset.el (script-representative-chars): Add
new scripts.
(otf-script-alist): Update from latest version.
(setup-default-fontset): Add new scripts.
* lisp/international/characters.el: Update syntax and category
tables for new characters and scripts.
(char-width-table): Update for changes in Unicode 14.0.
* lisp/international/mule-cmds.el (ucs-names): Update used and
unused ranges per Unicode 14.0.

* test/lisp/international/ucs-normalize-tests.el
(ucs-normalize-tests--failing-lines-part1)
(ucs-normalize-tests--failing-lines-part2): Update per the test
results.

* doc/lispref/nonascii.texi (Character Properties): Update Unicode
version number.

* etc/NEWS: Announce support for Unicode 14.0.

* admin/notes/unicode: Minor copyedits.

* doc/misc/flymake.texi: Fix @include docstyle.texi

Python shell: rearrange printing of newline before output

* progmodes/python.el (python-shell-output-filter-in-progress)
(python-shell-output-filter-buffer): Move defvars to avoid compiler
warnings.
(python-shell-eval-setup-code): Don't print a newline in
__PYTHON_EL_eval.
(python-shell-send-string): Insert newline before output when
applicable (bug#50514).

Make bookmark fringe marks evaporate

* lisp/bookmark.el (bookmark--set-fringe-mark): Make the bookmark
evaporate when a buffer is erased (like, for instance, when doing
`revert-buffer' in a vc buffer).

Mention `lisp-data-mode' in `emacs-lisp-mode' doc string

* lisp/progmodes/elisp-mode.el (emacs-lisp-mode): Mention
`lisp-data-mode'.

Adjust occur-context-menu and elisp-context-menu

* lisp/progmodes/elisp-mode.el (elisp-context-menu): Add separator
only when there is a symbol at mouse click.

* lisp/replace.el (occur-context-menu): Insert items in the middle
of the menu after mark-whole-buffer.

Add occur-related context-menu operations (bug#50552)

* replace.el (occur-word-at-mouse): Add new command.
(occur-symbol-at-mouse): Add new command.
(occur-context-menu): Add new function.

* lisp/window.el (display-buffer-in-previous-window): Add symbolp (bug#50576)

* lisp/tab-bar.el (tab-bar-close-other-tabs): Add arg ‘tab-number’.

(tab-bar-mouse-context-menu): Bind menu-item "Close other tabs" to
tab-bar-close-other-tabs with arg ‘tab-number’.

* lisp/tab-bar.el: Rename args to consistent naming convention.

Use the same naming scheme for function arguments.  Use the term "index" when
arguments count from 0, and the term "number" when arguments count from 1.

* lisp/tab-bar.el (tab-bar-select-tab): Rename ‘arg’ to ‘tab-number’.
(tab-bar-move-tab-to): Rename ‘from-index’ to ‘from-number’
and ‘to-index’ to ‘to-number’.
(tab-bar-move-tab-to-frame): Rename ‘from-index’ to ‘from-number’
and ‘to-index’ to ‘to-number’.
(tab-bar-new-tab-to): Rename ‘to-index’ to ‘tab-number’.
(tab-bar-close-tab): Rename ‘arg’ to ‘tab-number’
and ‘to-index’ to ‘to-number’.
(tab-bar-rename-tab): Rename ‘arg’ to ‘tab-number’.
(tab-bar-change-tab-group): Rename ‘arg’ to ‘tab-number’.

* lisp/mh-e/mh-e.el: Simplify file commentary for a native package.

; Add a note

Localize namespace-filtering code

To be able to filter results coming from
elisp-xref-find-def-functions, and for general ease of
understanding.

* lisp/progmodes/elisp-mode.el (elisp--xref-find-definitions):
Undo the previous change.
(xref-backend-apropos): Update accordingly.
(elisp--xref-filter-definitions): New function.
(xref-backend-definitions): Use it to post-filter the results
coming from elisp--xref-find-definitions.

* test/lisp/progmodes/elisp-mode-tests.el (find-defs-minor-defvar-c):
New test.
(find-defs-defun-defvar-el): Update test.

verilog-mode.el: Update verilog-mode from upstream.

* lisp/progmodes/verilog-mode.el: (verilog-basic-complete-re)
(verilog-behavioral-block-beg-re, verilog-defun-keywords)
(verilog-defun-level-generate-only-re, verilog-defun-level-re)
(verilog-endcomment-reason-re, verilog-indent-re) (verilog-keywords,
verilog-no-indent-begin-re) (verilog-set-auto-endcomments): Support
Verilog-A `analog` blocks (#1738).  Reported by Dan McMahill.
(verilog-read-defines): Fix verilog-read-defines to work
with SystemVerilog types (#1734).  Reported by Shareef Jalloq.
(verilog-indent-declaration,
verilog-pretty-declarations): Fix leaving extra spaces before tabs on
lining up declarations. (#1723) Reported by TAKAI Kousuke.
(verilog-auto-inst, verilog-auto-inst-port)
(verilog-read-auto-template-middle, verilog-read-sub-decls-line):
Support AUTONOHOOKUP to not AUTOWIRE hookup AUTO_TEMPLATE signals. (#1526)
Reported by firefoxtc.

* test/Makefile.in (XDG_CONFIG_HOME): Don't export (bug#50577).

* doc/misc/flymake.texi: Avoid xrefs in @copying.

This isn't really what @copying is for, and doesn't work with
makeinfo 4.13.

Unbreak make bootstrap (don't use cl-defun's &aux parameters)

* lisp/progmodes/flymake.el (flymake--handle-report): Don't use &aux.

cperl-mode.el: Allow non-ASCII Perl identifiers

Replace all "A-Z" regexp literals with unicode-aware rx constructs
wherever Perl allows non-ASCII identifiers.
* lisp/progmodes/cperl-mode.el (cperl-after-sub-regexp)
(cperl-after-label. cperl-sniff-for-indent)
(cperl-find-pods-heres, cperl-indent-exp)
(cperl-fix-line-spacing, cperl-imenu--create-perl-index)
(cperl-init-faces, cperl-find-tags):
Replace ASCII regex literals by unicode-aware rx constructs.
(cperl-init-faces): Eliminate unused lexical `font-lock-anchored'.
(cperl-have-help-regexp, cperl-word-at-point-hard): Allow non-ASCII
word characters.

* test/lisp/progmodes/cperl-mode-tests.el
(cperl-test-fontify-special-variables): New test for $^T
and $^{VARNAME}.
(cperl-test-ws-rx cperl-test-ws+-rx),
(cperl-test-version-regexp, cperl-test-package-regexp): Skip
for perl-mode.
(cperl-test-identifier-rx, cperl--test-unicode-setup)
(cperl-test-unicode-labels, cperl-test-unicode-sub)
(cperl-test-unicode-varname)
(cperl-test-unicode-varname-list, cperl-test-unicode-arrays)
(cperl-test-unicode-hashes, cperl-test-unicode-hashref)
(cperl-test-unicode-proto, cperl-test-unicode-fhs)
(cperl-test-unicode-hashkeys, cperl-test-word-at-point):
New tests for unicode identifiers.
 (cperl-test-imenu-index): Add a unicode identifier to the test.

* test/lisp/progmodes/cperl-mode-resources/grammar.pl: Add a
function with non-ASCII name for imenu tests.

* lisp/emacs-lisp/checkdoc.el (checkdoc-symbol-words): Fix type.

A further fix for toolbar visibility problems on macOS (bug#50534)

* src/nsterm.m (ns_update_begin): Ensure the toolbar's visibility is
set correctly.

Fix recent changes in Flymake manual

* doc/misc/flymake.texi: Fix typos.  Downcase the first word of
each index entry, for more reliable sorting.
(Starting Flymake, Finding diagnostics, Troubleshooting): Fix
typos.

Make `find-function-source-path' into obsolete alias

* lisp/finder.el (finder-commentary): Adjust usage.

* lisp/emacs-lisp/find-func.el (find-function-source-path): Made
into obsolete alias (bug#50508).
(find-library-source-path): New name.
(find-library-name, find-library, find-function-noselect)
(find-variable-noselect, find-definition-noselect): Adjust usage
and update doc strings.

Re-organize and rewrite parts of the Flymake manual

bug#50244

* doc/misc/flymake.texi (Starting Flymake): New section.
(Finding diagnostics): New section, now contains info previously in
"Listing diagnostics"
(Mode line status): Renamed from "Mode-line syntax check status"
(Troubleshooting): Renamed from "Backend exceptions".
(Flymake error types): Tweak phrasing.

Add support for project-wide diagnostics in Flymake (bug#50244)

This is done with two new concepts: "foreign diagnostics" and
"list-only diagnostics".  The manual has been updated with a
description of these new concepts.

* doc/misc/flymake.texi (Flymake utility functions):
Explain creation of foreign diagnostics.
(Foreign and list-only diagnostics): New subsection.
(Listing diagnostics): New subsection.

* lisp/progmodes/flymake.el
(Version): Bump to 1.2.1
(project): Require project.
(flymake--diag): Add new slots 'orig-beg' and 'orig-end'.  Rename
'buffer' slot to 'locus'.
(flymake-make-diagnostic): Rework docstring.  Accept stringp
LOCUS arg.
(flymake-diagnostic-beg, flymake-diagnostic-end)
(flymake-diagnostic-buffer):  Simplify definition.
(flymake--equal-diagnostic-p): New helper
(flymake--highlight-line): Rework.  Accept FOREIGN arg.
(flymake--state): Work docstring. Add new slot 'foreign-diags'
(flymake--handle-report): Call
flymake--update-diagnostics-listings.
(flymake--handle-report): New helper.
(flymake--mode): Forward declare.
(flymake--handle-report): Rework for foreign diagnostics.
(flymake-mode): When turning on, notice any Flymake diagnostics
for current buffer.  When turning off update diagnostics listings.
(flymake-kill-buffer-hook): Turn off flymake explicitly before
killing.
(flymake--mode-line-counter): Use flymake-diagnostics to collect
diagnostics.
(flymake-show-diagnostic): Visit buffer of file-specific
diagnostic.
(flymake--tabulated-entries-1): New helper extracted from
flymake--diagnostic-buffer-entries.
(flymake--diagnostics-buffer-entries): Rework.
(flymake--diagnostics-base-tabulated-list-format): New helper.
(flymake--diagnostics-buffer-name): Adjust.
(flymake-list-only-diagnostics): New variable.
(flymake--project-diagnostic-list-project): New variable.
(flymake--clear-list-only-diagnostics): New helper.
(flymake-project-diagnostics-mode): New major mode.
(flymake--project-diagnostics)
(flymake--project-diagnostics-entries)
(flymake--project-diagnostics-buffer): New helpers.
(flymake-show-project-diagnostics): New command.
(flymake--update-diagnostics-listings): New helper.
(flymake-show-buffer-diagnostics): Renamed from flymake-diagnostics-buffer.

* etc/NEWS: Mention change.

Bump lisp/progmodes/project.el version to 0.7.1

Amont other things exposes the new project-buffers generic function to
ELPA users.

* lisp/progmodes/project.el (Version): Bump to 0.7.1

Keep and report "foreign" diangnostics in flymake-cc Flymake backend

This includes diagnostics for .h files that sprang up when checking a
c file.  Those diagnostics are reported to the Flymake infrastructure
which does not (yet) do anything with them.

This includes a change to the test fixtures, too.

* lisp/progmodes/flymake-cc.el (flymake-cc--make-diagnostics): Rework

* test/lisp/progmodes/flymake-resources/another-problematic-file.c:
  New file.

* test/lisp/progmodes/flymake-resources/some-problems.h:
  Add a function declaration..

Abbreviate Flymake backend name in flymake-show-diagnostics-buffer

* lisp/progmodes/flymake.el (flymake--diagnostics-buffer-entries):
(flymake-diagnostics-buffer-mode): Report abbreviated backend, too.

Unbreak M-x compile-defun of functions using flymake-log

* lisp/progmodes/flymake.el (flymake-log): Check if compilation unit
  is indeed a string before treating it as a file name.

Refactor some Flymake functions

* lisp/progmodes/flymake.el (flymake-diagnostic-buffer): New
helper.
(flymake-diagnostic-beg, flymake-diagnostic-end): Tweak docstring.
(flymake--handle-report): Simplify.
(flymake--publish-diagnostics): Helper for flymake--handle-report.
(flymake--mode-line-counter, flymake-show-diagnostic)
(flymake--diagnostics-buffer-entries): Use
flymake-diagnostic-buffer, flymake-diagonstic-type,
flymake-diagnostic-beg.

Rename flymake--backend-state to flymake--state

The previous name was confusing and akward and dreadful to type and
read.

* lisp/progmodes/flymake.el (flymake--state): Rename from
flymake--backend-state.
(flymake--with-backend-state): Use flymake--state.
(flymake--handle-report): Use flymake--state.
(flymake--collect): Use flymake--state.
(flymake-running-backends): Use flymake--state.
(flymake--disable-backend): Use flymake--state.
(flymake--run-backend): Use flymake--state.
(flymake-start): Use flymake--state.
(flymake-mode): Use flymake--state.
(flymake--mode-line-title): Use flymake--state.
(flymake--mode-line-exception): Use flymake--state.
(flymake--mode-line-counter): Use flymake--state.

Project File Commands manual clarification

* doc/emacs/maintaining.texi (Project File Commands): Clarify what
happens with the file name under point.

Fix incorrectly appearing toolbar on NS (bug#50534)

* src/nsmenu.m (update_frame_tool_bar): Ensure both sides of the test
are booleans.
* src/nsterm.m ([EmacsWindow createToolbar:]): Make the toolbar
non-visible initially, in case things get out of sync.  Remove call to
update_frame_tool_bar: the window isn't yet associated with the view,
so it will return immediately.

Fix libgccjit detection on macOS

* configure.ac: Combine the Homebrew and MacPorts detection so they
will not create nonsense flags if both are installed.

* lisp/tab-bar.el: Close tab only on mouse-1, not down-mouse-1 (bug#41343)

* lisp/tab-bar.el (tab-bar-mouse-select-tab): Don't close the tab
when clicked on the close button.
(tab-bar-mouse-close-tab-from-button): New function.
(tab-bar-map): Bind [mouse-1] to 'tab-bar-mouse-close-tab-from-button'.
(tab-bar-mouse-move-tab): Do nothing on non-tab events.

; * lisp/emacs-lisp/checkdoc.el: Fix typo in previous commit.

; More minor docfixes found by checkdoc

Add user option to avoid checkdoc warning for unescaped left paren

* lisp/emacs-lisp/checkdoc.el
(checkdoc-column-zero-backslash-before-paren): New user option to
avoid warning on unescaped left parenthesis in column zero.
(checkdoc-this-string-valid-engine): Respect above new option.

Minor improvements to checkdoc

* lisp/emacs-lisp/checkdoc.el (checkdoc-symbol-words): Add ignored
values.
(checkdoc-proper-noun-list): Remove XEmacs from list of words to
capitalize; there is little need to insist on consistency here.
(checkdoc-in-abbreviation-p): Add abbreviation "etc." and sort entries
alphabetically.

Use the term "future history" rather than "default"

* lisp/progmodes/project.el
(project-find-file, project-or-external-find-file):
Update docstring.
(project--read-file-cpd-relative, project--read-file-absolute)
(project--completing-read-strict): Rename DEFAULT to MB-DEFAULT.
(project-find-file-in): Rename FILENAME to SUGGESTED-FILENAME.

Make sure to return some valid project root

* lisp/progmodes/project.el (project-prompt-project-dir):
If the user just pressed RET on prompt, prompt again.

* lisp/progmodes/elisp-mode.el (elisp-context-menu): New function (bug#9054)

(emacs-lisp-mode): Add elisp-context-menu to context-menu-functions.

* lisp/isearch.el: Improve 'isearch-allow-motion' feature (bug#50466)

* lisp/isearch.el: Add recenter to 'isearch-motion' property of
'end-of-buffer' to maximize the number of search hits on the screen.
In 'isearch-motion' property of 'scroll-up-command' use 'recenter 0'
for the first line of the screen.
(isearch-beginning-of-buffer)
(isearch-end-of-buffer): Sync logic from 'isearch-allow-motion' part
of isearch-pre-command-hook.  Direct users to isearch-allow-motion
in the docstrings.
(isearch-pre-command-hook): Don't override shifted 'isearch-yank-on-move'
in 'isearch-allow-motion'.

Remove duplication of `find` file pattern arguments

* lisp/cedet/semantic/symref/grep.el
(semantic-symref-derive-find-filepatterns): Avoid including the same
pattern twice.

* Clean-up some unnecessary macro usage in comp.c

* src/comp.c (emit_static_object)
(Fcomp_native_driver_options_effective_p, add_driver_options)
(Fcomp__compile_ctxt_to_file, Fcomp_libgccjit_version): Clean-up
unenecessary 'defined (WINDOWSNT)' usage.

Continue NEWS tag checking

Fix typo in previous files.el change

Mention unibyte issues in insert-file-contents-literally doc string

* lisp/files.el (insert-file-contents-literally): Mention possible
issues with multibyte buffers (bug#50560).

* doc/lispref/variables.texi (named-let): Document TCO

Fix the tests

* test/lisp/progmodes/xref-tests.el
(xref--xref-file-name-display-is-abs)
(xref--xref-file-name-display-is-nondirectory)
(xref--xref-file-name-display-is-relative-to-project-root):
Update for the latest change in xref.el.

Use a fringe mark in bookmark instead of a whole background line

* lisp/bookmark.el (bookmark-face): Adjust colors.
(bookmark-fringe-mark): New bitmap.
(bookmark--fontify): Use a fringe instead of marking the whole line.
(bookmark--unfontify): Adjust to remove.
(bookmark--jump-via): Ditto.
(bookmark-set-fringe-mark): Renamed from bookmark-fontify.
(bookmark--set-fringe-mark, bookmark--remove-fringe-mark): Renamed
from --*fontify.  Callers adjusted.

NEWS copy edits and tagging

Correct nroff-mode NEWS entry after `M-o' changes

Mention how to disable auto-fill-mode in the auto-fill section

* doc/lispref/text.texi (Margins): Mention how to disable
auto-fill-mode.

Document backtrace-on-error-noninteractive in the --batch section

* doc/emacs/cmdargs.texi (Initial Options): Mention
backtrace-on-error-noninteractive.

Further NEWS tagging updates

completions-annotations doc string clarification

* lisp/minibuffer.el (completions-annotations): Mention that it's
not always used.

Update some more NEWS tagging

Mention `benchmark-call' in the manual

* doc/lispref/debugging.texi (Profiling): Mention `benchmark-call'.

Update some pcase NEWS tags for already-documented functions

Update NEWS tagging for string helper functions

Document named-let and update some NEWS tags

* doc/lispref/variables.texi (Local Variables): Document `named-let'.

Clarify bookmark-fontify NEWS entry

package-menu-execute doc string clarification

* lisp/emacs-lisp/package.el (package-menu-execute): Say what
happens to upgrade-marked packages (bug#50551).

* etc/NEWS: Clarify insert-into-buffer (bug#50558).

Support mouse events clicked on the tab bar but outside of any tab (bug#41343)

* lisp/tab-bar.el (tab-bar--key-to-number): Return non-nil non-numeric t
when no tab is used.  Return nil for current-tab.
(tab-bar-mouse-select-tab, tab-bar-mouse-close-tab): Do nothing
when tab-bar--key-to-number returns non-nil non-numeric t
for click events outside of any tab.
(tab-bar-mouse-context-menu): Add context menu when mouse is clicked
outside of tabs.  Add "Duplicate" alongside with "Close" to the menu
used when mouse is clicked on a tab.
(toggle-tab-bar-mode-from-frame, toggle-frame-tab-bar): Move code
closer to 'tab-bar-show'.

* src/xdisp.c (handle_tab_bar_click): Return Qtab_bar with empty list
when mouse is clicked on the tab bar but outside of any tab.

Only do multi-isearch in eww if there's next/prev links

* lisp/net/eww.el (eww-handle-link): Only do multi-isearch if
there's a next/prev link in the HTML (bug#50497).
(eww-setup-buffer): Clear the function.
(eww-mode): Don't set it here.

Change value of DEFAULT_TAB_BAR_BUTTON_MARGIN from 4 to 1 (bug#50424)

* doc/emacs/frames.texi (Tab Bars): Improve documentation.

Fix detection of char regions in print-fontset-element

* lisp/international/mule-diag.el (print-fontset-element): Fix the
regexp for "foo .. bar " (bug#50519).

Add some search-whitespace-regexp examples

* lisp/isearch.el (search-whitespace-regexp): Add some
alternatives in the defcustom.

Mention get-byte in shortdoc

* lisp/emacs-lisp/shortdoc.el (buffer): Mention `get-byte' here.

bug-reference.el: Adapt default debbugs bug regexp for IRC modes

* lisp/progmodes/bug-reference.el (bug-reference-setup-from-irc-alist):
Adapt regexp so that group 1 defines overlay region.

bug-reference.el: Adapt default debbugs bug regexp for mail modes

* lisp/progmodes/bug-reference.el (bug-reference-setup-from-mail-alist):
Adapt regexp so that group 1 defines overlay region.

Declare unused function cperl-inside-parens-p obsolete

* lisp/progmodes/cperl-mode.el (cperl-inside-parens-p): Declare
unused function obsolete.

; Minor doc fixes found by checkdoc

Improve checkdoc abbreviation handling

* lisp/emacs-lisp/checkdoc.el
(checkdoc-in-abbreviation-p): New helper function.
(checkdoc-sentencespace-region-engine): Fix handling abbreviations
after escaped parenthesis.

* test/lisp/emacs-lisp/checkdoc-tests.el
(checkdoc-tests-in-abbrevation-p)
(checkdoc-tests-in-abbrevation-p/with-parens)
(checkdoc-tests-in-abbrevation-p/with-escaped-parens): New tests.

Remove some remaining references to XEmacs

* lisp/allout.el (allout-overlay-preparations):
* lisp/cedet/semantic/decorate/include.el
(semantic-decoration-unknown-include-menu)
(semantic-decoration-fileless-include-menu):
* lisp/cedet/semantic/idle.el (semantic-idle-scheduler-setup-timers):
* lisp/vc/ediff-init.el:
* lisp/vc/ediff-util.el (ediff-mode): Remove some remaining references
to XEmacs.

Extend xref-file-name-display to elisp and etags definitions

And all other types of locations (with a looks-like-file-name check).

* lisp/progmodes/xref.el (xref--group-name-for-display): Extract
from xref-buffer-location's implementation of xref-location-group.
(xref-file-location): Define trivial reader for the 'file' slot.
(xref-location-group): Update docstring.
(xref--analyze): Use the new function here, to be able to format
group names coming from any location type.

ERC: Use 'string-replace' only on Emacs 28 and later

* lisp/erc/erc-dcc.el (erc-dcc-unquote-filename):
* lisp/erc/erc.el (erc-quit-reason-zippy, erc-part-reason-zippy)
(erc-update-mode-line-buffer, erc-message-english-PART): Use
'string-replace' only on Emacs 28 and later, otherwise use
'replace-regexp-in-string' on older Emacsen.

ERC: Use 'string-search' only on Emacs 28 and later

* lisp/erc/erc-backend.el (erc-parse-server-response):
* lisp/erc/erc-dcc.el (erc-dcc-member):
* lisp/erc/erc-speedbar.el (erc-speedbar-expand-server)
(erc-speedbar-expand-channel, erc-speedbar-expand-user):
* lisp/erc/erc.el (erc-send-input): Use 'string-search' only on
Emacs 28 and later, otherwise use 'string-match' on older Emacsen.

* lisp/tab-bar.el (tab-bar-get-buffer-tab): Use 'remq' instead of 'seq-remove'

Allow region-related context menu to be used on selected region with one click

* lisp/mouse.el (mouse-drag-track): Don't deactivate the mark for
the context menu invoked by down-mouse-3.

https://lists.gnu.org/archive/html/emacs-devel/2021-08/msg01577.html

* lisp/thingatpt.el (thing-at-mouse): New function (bug#50256).

* lisp/net/dictionary.el: Add 'context-menu-dictionary' to
'context-menu-functions'.
(dictionary-search-word-at-mouse): New function.
(context-menu-dictionary): New function that uses 'thing-at-mouse'.
(dictionary-mouse-popup-matching-words): Remove stray 'selected-window'.

* lisp/textmodes/flyspell.el (flyspell-context-menu): Add '_click' arg.

* lisp/mouse.el (context-menu-map): Add 'click' arg to called funs (bug#50256)

(context-menu-toolbar, context-menu-global, context-menu-local)
(context-menu-minor, context-menu-buffers, context-menu-vc)
(context-menu-undo, context-menu-region, context-menu-ffap): Add 'click' arg.

* lisp/dired.el (dired-context-menu):
* lisp/help-mode.el (help-mode-context-menu):
* lisp/info.el (Info-context-menu):
* lisp/net/eww.el (eww-context-menu):
* lisp/net/goto-addr.el (goto-address-context-menu):
* lisp/progmodes/prog-mode.el (prog-context-menu):  Add 'click' arg.

Fix quoting style in Lisp comments

* lisp/textmodes/rst.el:
* lisp/progmodes/elisp-mode.el (elisp--xref-find-definitions):
* lisp/org/org.el:
* lisp/org/org-list.el (org-list-to-generic):
* lisp/org/org-compat.el:
* lisp/hexl.el (hexl-ascii-region):
* lisp/emacs-lisp/lisp-mode.el:
* lisp/calendar/calendar.el: In comments, quote 'like this'.

* lisp/mouse.el (context-menu-map): Remove duplicate separators (bug#50067).

* lisp/mouse.el (context-menu-undo, context-menu-region):
* lisp/progmodes/prog-mode.el (prog-context-menu):
Use 'when' instead of ':visible' that allows to remove duplicate separators
created between empty submenus.

; Fix symbol quoting typos

Use window-point in event-start and event-end (bug#50256)

* lisp/subr.el (event-start, event-end): Provide window-point
as an arg for posn-at-point, and for the constructed list.

* lisp/help-mode.el (help-mode-context-menu): Remove a kludge
that checked if window-buffer is current-buffer.

* lisp/tab-bar.el: Improve logic of 'ignore-current-tab'.

* lisp/tab-bar.el (tab-bar-get-buffer-tab): Prefer the current tab
when 'ignore-current-tab' is nil.
(display-buffer-in-tab): Use alist entry 'ignore-current-tab'
as the third arg of 'tab-bar-get-buffer-tab'.  Improve docstring.

Suggested by Feng Shu <tumashu@163.com>
https://lists.gnu.org/archive/html/emacs-devel/2021-09/msg00955.html

; * lisp/eshell/em-unix.el (nil-blank-string): Doc fix

* lisp/eshell/em-unix.el (nil-blank-string): Fix doc string
(bug#50549).

Copyright-paperwork-exempt: yes

Minor copyedits in Emacs FAQ

* doc/misc/efaq.texi (What was XEmacs?, Colors on a TTY): Fix
wording and improve the description.

; * doc/misc/efaq.texi (What was XEmacs?): Restore pre-merge text.

Fix read-no-blanks-input doc string typo

* lisp/minibuffer.el (read-no-blanks-input): Fix doc string typo.