* lisp/cedet/mode-local.el: Use lexical-binding and `declare`

(with-mode-local-symbol, with-mode-local, setq-mode-local)
(defvar-mode-local, defconst-mode-local)
(define-overloadable-function, define-mode-local-override):
Use `declare` for indent and edebug specs.
(xref-mode-local-find-overloadable-regexp): Simplify regexp.
(mode-local-setup-edebug-specs): Delete.
(edebug-setup-hook): Don't use any more.

* lisp/dired.el (dired-mark-pop-up): Set tab-line-format to nil (bug#37699).

* lisp/tab-bar.el: Allow to specify interactively where to add a new tab.

* lisp/tab-bar.el (tab-bar-new-tab-to): Rename from tab-bar-new-tab.
Add optional arg TO-INDEX.
(tab-bar-new-tab): New implementation to use relative ARG.
(tab-new-to): Alias to tab-bar-new-tab-to.

* lisp/tab-bar.el: Rename tab-bar-swap-tabs to tab-bar-move-tab-to.

* lisp/tab-bar.el (tab-bar-move-tab-to): Rename from tab-bar-swap-tabs.
Change logic to push the moved tab between existing tabs.
(tab-bar-move-tab): Call tab-bar-move-tab-to instead of tab-bar-swap-tabs.
(tab-move-to): Rename alias from tab-swap.

Implement tab close undo feature for tab-bar.

* lisp/tab-bar.el (tab-bar-closed-tabs): New variable.
(tab-bar-close-tab): Add closed tab to tab-bar-closed-tabs.
Disable tab-bar-mode on closing the last tab.
(tab-bar-close-other-tabs): Add all closed tabs to tab-bar-closed-tabs.
(tab-bar-undo-close-tab): New command.
(tab-undo): Alias to tab-bar-undo-close-tab.

* lisp/cedet/semantic/analyze/complete.el: Fix completion-at-point

Completion tables are not supposed to signal errors:

    emacs -q
    M-x semantic-mode
    ; visit a file supported by semantic, such as a C file
    ; put cursor in a blank space
    M-x completion-at-point
    It will error with: "Nothing to complete"

(semantic-analyze-possible-completions): Return nil instead of
signaling errors.

Ensure that the prompt is kept on the final line

* lisp/erc/erc-goodies.el (erc-possibly-scroll-to-bottom): New
function.
(scrolltobottom): Add to erc-insert-done-hook.

* lisp/erc/erc.el (erc-insert-done-hook): New hook (bug#11697).
(erc-display-line-1): Use it.

Make erc-cmd-CLEAR do what its doc string says

* lisp/erc/erc.el (erc-cmd-CLEAR): Delete the buffer contents
instead of recentering (bug#31743).

Make display of S/MIME signatures slightly better

* lisp/epg.el (epg-signature-to-string): Decode percent escapes
(bug#36101).

Make Gnus recognise "git am" diffs in all groups

* lisp/gnus/mm-uu.el (mm-uu-diff-groups-regexp): Recognise diffs
in all groups (bug#32730).

Add version tag to gnutls-min-prime-bits

* lisp/net/gnutls.el (gnutls-min-prime-bits): Add version tag.

Avoid extra lines in python-shell font lock buffer (Bug#33959)

* lisp/progmodes/python.el
(python-shell-font-lock-comint-output-filter-function): Avoid writing
a newline to the font lock buffer when receiving an empty string.

Set expected result for a cedet test

* test/lisp/cedet/srecode-utest-template.el (srecode-utest-project):
Test fails on hydra.nixos.org, for some reason.

Tab-line horizontal scrolling with UI buttons and commands (bug#37667)

* etc/images/tabs/left-arrow.xpm:
* etc/images/tabs/right-arrow.xpm: New images.

* lisp/tab-line.el (tab-line-left-map, tab-line-right-map): New keymaps.
(tab-line-left-button, tab-line-right-button): New variables.
(tab-line-tab-name-function): Turn defvar into defcustom.
(tab-line-tab-name-buffer): New function.
(tab-line-tab-name-truncated-buffer): Rename from tab-line-tab-name.
(tab-line-tabs-limit): Default to nil.
(tab-line-tabs): Behavior depends on tab-line-tabs-limit.
(tab-line-format): Use window-parameter tab-line-hscroll.
Add left/right buttons.
(tab-line-hscroll): New function.
(tab-line-hscroll-right, tab-line-hscroll-left): New commands
bound to mouse-wheel.  Rebind tab-switching commands to mouse-wheel
with Ctrl-modifier.

Fix "make bootstrap" build warning in tab-bar.el

* lisp/tab-bar.el (require): Require seq when compiling to avoid a
compilation warning.  The function it uses is autoloaded, but
autoloads aren't loaded when this is built (on "make bootstrap").

Fix recent changes in documentation

* doc/lispref/edebug.texi (Edebug Eval, Eval List): Reword
recently added text to follow conventions.

* src/textprop.c (Ftext_properties_at): Don't use passive tense
in doc string.

Various doc fixes for auto-insert-mode

* doc/misc/autotype.texi (Autoinserting): Various doc fixes.
* lisp/autoinsert.el (top-level): Recommend 'auto-insert-mode' over
'add-hook'.

Make text-properties-at mention describe-text-properties

* src/textprop.c (Ftext_properties_at): Mention
describe-text-properties in the doc string.

Add a fringe example

* doc/lispref/display.texi (Fringe Bitmaps): Add an example.

rx doc string tweaks

* lisp/emacs-lisp/rx.el (rx--translate-seq, rx--translate-or, rx):
Say "zero or more" instead of "one or more" where applicable.

Make edebug-eval-last-sexp interactively take a zero prefix

* lisp/emacs-lisp/edebug.el (edebug-eval-last-sexp): Make the zero
prefix work analogously to in eval-last-sexp (bug#28895).
(edebug-eval-print-last-sexp): Ditto.

Show stash counts in button in vc-dir

Based on suggestions from Mattias Engdegård.

* lisp/vc/vc-git.el (vc-git--make-button-text): New function to
generate text for stash button.
(vc-git-make-stash-button): Show stash counts.  Delete and recreate
button when toggling.
(vc-git-dir-extra-headers): Pass counts to vc-git-make-stash-button.
Treat stash count <= vc-git-show-stash as equivalent to showing entire
list.

Move entry for \Ref into LaTeX core

* lisp/textmodes/reftex-vars.el (reftex-ref-style-alist): Move
entry for \Ref from "Varioref" into "Default" as this macro is
part of LaTeX 2019-10-01 kernel.
Rearrange entries for "Varioref".

* etc/NEWS: Improve documentation of 'package-initialize'.

Portcheck only if --enable-gcc-warnings

Problem reported by Richard Copley (Bug#37852).
This patch causes the problem to not occur if one uses plain
‘configure’.  The problem can still occur if with ‘configure
--enable-gcc-warnings’, so a further fix may be needed.
* configure.ac (GNULIB_PORTCHECK, _FORTIFY_SOURCE):
Define these only with an explicit --enable-gcc-warnings.

Remove XEmacs compat code from speedbar.el

* lisp/speedbar.el (speedbar-frame-plist, speedbar-frame-mode)
(speedbar-make-overlay, speedbar-overlay-put, speedbar-delete-overlay)
(speedbar-mode-line-update, speedbar-frame-reposition-smartly)
(speedbar-set-mode-line-format, speedbar-reconfigure-keymaps)
(speedbar-add-localized-speedbar-support, speedbar-check-vc)
(speedbar-highlight-one-tag-line)
(speedbar-unhighlight-one-tag-line): Remove XEmacs compat code.

* doc/misc/speedbar.texi (Frames and Faces): Remove documentation for
XEmacs.

* lisp/vc/vc-annotate.el (vc-annotate-lines): Use set-face-extend (bug#37774)

Try to not put SMTP passwords in the *Messages* buffer

* lisp/mail/smtpmail.el (smtpmail--sanitize-error-message): New
function.
(smtpmail-send-it): Use it.
(smtpmail-send-queued-mail): Ditto.

* lisp/emacs-lisp/cursor-sensor.el: Make it possible to reveal invisible text

(cursor-sensor-mode): Hook into post-command-hook as well.
(cursor-sensor--detect): Make argument optional.

Tiny clean-up of previous edebug patch

* lisp/emacs-lisp/edebug.el (edebug--overlay-breakpoints): Clean
up code slightly.

Ensure we always remove the breakpoint overlays

* lisp/emacs-lisp/edebug.el (edebug--display-1): Remove the
overlays here -- this cleans up after exiting no matter how we
exited.

Add fringe markers to edebug breakpoints

* lisp/emacs-lisp/edebug.el (edebug--overlay-breakpoints): Set a
fringe element to mark the breakpoint.
(edebug-breakpoint): Fringe marker.

Clean up previous icalendar.el change

* lisp/calendar/icalendar.el (icalendar--rris): Redefine as obsolete
function alias.

Remove more XEmacs compat code from viper-*.el

* lisp/emulation/viper-cmd.el (viper-submit-report):
* lisp/emulation/viper-init.el (viper-set-insert-cursor-type)
(viper-restore-cursor-type, viper-use-replace-region-delimiters)
(viper-has-face-support-p, viper-window-display-p)
(viper-color-display-p, viper-device-type):
* lisp/emulation/viper-mous.el (viper-mouse-click-search-word)
(viper-mouse-click-insert-word, viper-mouse-click-get-word)
(viper-mouse-click-posn, viper-mouse-click-window):
* lisp/emulation/viper-util.el (viper-abbreviate-file-name)
(viper-set-replace-overlay, viper-maybe-checkout): Remove XEmacs
compat code.

Remove XEmacs compat code from icalendar.el (Bug#37816)

* lisp/calendar/icalendar.el (icalendar--convert-string-for-export)
(icalendar--convert-string-for-import)
(icalendar--parse-summary-and-rest)
(icalendar--convert-ordinary-to-ical)
(icalendar--convert-weekly-to-ical)
(icalendar--convert-yearly-to-ical)
(icalendar--convert-block-to-ical)
(icalendar--convert-cyclic-to-ical)
(icalendar--convert-anniversary-to-ical)
(icalendar--format-ical-event)
(icalendar--convert-recurring-to-diary): Remove XEmacs compat code.
(icalendar--rris): Declare obsolete.

Avoid false indications from Flymake in .dir-locals.el files

* lisp/progmodes/elisp-mode.el (emacs-lisp-mode): Don't install
'elisp-flymake-checkdoc' and 'elisp-flymake-byte-compile'
hooks for .dir-locals.el files.  Reported by Clément
Pit-Claudel <cpitclaudel@gmail.com>.

; Add commentary to w32inevt.c

* src/w32inevt.c (do_mouse_event): Comment on mouse
coordinates in console mouse-wheel events.

Add button to vc-dir to toggle visibility of stash list

* lisp/vc/vc-git.el: Move cl-lib require outside 'eval-when-compile'.

* lisp/vc/vc-git.el (vc-git-show-stash):New user option.
(vc-git-make-stash-button): Create button that allows hiding the stash
list.
(vc-git-dir-extra-headers): Split stash list into hideable and
non-hideable parts depending on value of vc-git-show-stash.  Add
button to toggle visibility of hideable part.

* etc/NEWS: Announce it.

Add a way to disable substitution of command keys in help strings

* src/keyboard.c (help_echo_substitute_command_keys): New function.
(help_echo_echo, parse_menu_item): Use it.
(syms_of_keyboard): Define Qhelp_echo_inhibit_substitution.

* doc/lispref/text.texi (Special Properties), etc/NEWS: Document
the effect of 'help-echo-inhibit-substitution'.

Avoid fixnum round trip in prefix-numeric-value

* src/callint.c (Fprefix_numeric_value): Simplify.

* lisp/tab-line.el: Bind mouse commands to [tab-line].

* lisp/tab-line.el: Bind mouse-4/mouse-5, wheel-up/wheel-down
globally to [tab-line].
(tab-line-tab-map): Remove local bindings of mouse-4/mouse-5.
(tab-line-new-tab, tab-line-switch-to-prev-tab)
(tab-line-switch-to-next-tab, tab-line-close-tab):
Turn commands into mouse-free (can be used without mouse).

Don't try to add nil packages on refresh

* lisp/emacs-lisp/package.el (package-read-archive-contents): Don't
try to add nil entries.  Warn instead.  (Bug#28502)
* test/lisp/emacs-lisp/package-tests.el
(package-test-update-archives/ignore-nil-entry): New test.
* test/lisp/emacs-lisp/package-resources/with-nil-entry/archive-contents:
New file.

Add a command to toggle an edebug breakpoint

* doc/lispref/edebug.texi (Breakpoints): Document this.

* lisp/emacs-lisp/edebug.el (edebug-disabled-breakpoint): New face
(bug#23472).
(edebug-enabled-breakpoint): Rename.
(edebug--overlay-breakpoints): Use the new face.
(edebug-toggle-disable-breakpoint): New command and keystroke.

Remove XEmacs compat code from decipher.el

* lisp/play/decipher.el (decipher-last-command-char)
(decipher-keypress): Remove XEmacs compat code.

* lisp/tab-bar.el: Use autoloaded seq-position.

* lisp/tab-bar.el (tab-bar--current-tab-index)
(tab-bar--tab-index, tab-bar--tab-index-by-name):
Use seq-position.

(tab-bar-select-tab, tab-bar-new-tab, tab-bar-close-tab)
(tab-bar-close-other-tabs, tab-bar-rename-tab)
(tab-bar-list-execute): Call force-mode-line-update
unconditionally independent from tab-bar-mode.

(tab-bar-rename-tab, tab-bar-rename-tab-by-name):
Use read-from-minibuffer instead of read-string
to be able to enter empty string.

Remove XEmacs compat code from meta-mode.el

* lisp/progmodes/meta-mode.el (meta-mode-menu):
(meta-mode-load-hook): Remove XEmacs compat code.

Remove last XEmacs compat code from tree-widget.el

* lisp/tree-widget.el (tree-widget-image-properties-xemacs)
(tree-widget-set-theme, tree-widget--cursors)
(tree-widget-image-properties, tree-widget-button-keymap)
(tree-widget-icon, tree-widget-value-create): Remove XEmacs compat
code.

Remove leftover XEmacs compat code from dig.el

* lisp/net/dig.el (top-level): Remove leftover XEmacs compat code.

Add missing rx symbols `bow' and `eow' to documentation

* doc/lispref/searching.texi (Rx Constructs):
* lisp/emacs-lisp/rx.el (rx):  Add missing synonyms.

* lisp/tab-bar.el (tab-bar-swap-tabs): Use cl-rotatef instead of rotatef.

* lisp/tab-bar.el (tab-bar-swap-tabs, tab-bar-move-tab): New commands.

(tab-swap, tab-move): New aliases to new commands.

Disable pause/resume from menu in snake and tetris

* lisp/play/tetris.el (tetris--menu-def):
* lisp/play/snake.el (snake--menu-def): Disable pause/resume from
menu.

Optimize c-crosses-statement-barrier-p for large blocks of comment.

This fixes bug #18134.

* lisp/progmodes/cc-engine.el (c-crosses-statement-barrier-p): Give a limit
to the c-backward-syntactic-ws which is searching for a virtual semicolon.  In
the main loop, Use c-forward-syntactic-ws to skip blocks of comments.

Provide default value for tab-name/frame-name reading minibuffer

* lisp/tab-bar.el (tab-bar-rename-tab, tab-bar-rename-tab-by-name):
Provide default value for read-string.
(tab-bar-select-tab-by-name): Alias for tab-bar-switch-to-tab.

* lisp/frame.el (set-frame-name): Provide default value for
read-string in interactive spec.

* lisp/cus-start.el (tab-bar-position): Use choice instead of boolean.

Make edebug-mode-map take precedence

* lisp/emacs-lisp/edebug.el (edebug--recursive-edit): Bind
minor-mode-overriding-map-alist to avoid other minor modes hiding the
edebug commands (bug#11018).

Fix internal-lisp-face-attributes to match face.

* lisp/face-remap.el (internal-lisp-face-attributes): Updated the
vector members to match the real member names. (Bug#37806) (Bug#37824)

In xref-location-marker, handle deleted file or outdated xref location nicely

* lisp/progmodes/xref.el (xref-location-marker): Add ignore-errors.

Update FAQ entry on XEmacs (Bug#37815)

* doc/misc/efaq.texi (Difference between Emacs and XEmacs): Update
section to reflect the current state of affairs.  XEmacs is not
actively developed and is lacking many important features of Emacs.

Improve doc string of eshell and eshell-buffer-name

* lisp/eshell/eshell.el (eshell-buffer-name, eshell): Improve doc
strings, by clarifying how buffers are named.  Also refer users to the
Info manual.  (Bug#37178)

* doc/lispref/display.texi (Low-Level Font): Describe max-width.

Fix edebug--restore-breakpoints re-instrumentinging bug-out

* lisp/emacs-lisp/edebug.el (edebug--restore-breakpoints): Don't
bug out when instrumenting/de-instrumenting/re-instrumenting.

Add a new edebug-breakpoint face

* doc/lispref/edebug.texi (Breakpoints): Mention it.

* lisp/emacs-lisp/edebug.el (edebug-breakpoint): New face.

while-no-input-ignore-events manual clarification

* doc/lispref/commands.texi (Event Input Misc): Be slightly
clearer about what while-no-input-ignore-events is.

New command to clear all breakpoints in a function

* doc/lispref/edebug.texi (Breakpoints): Mention it.

* lisp/emacs-lisp/edebug.el (edebug-unset-breakpoints): New
command and keystroke.

Preserve breakpoints when Edebug-reinstrumenting functions

* lisp/emacs-lisp/edebug.el (edebug--overlay-breakpoints): New
function (bug#23470).

* lisp/emacs-lisp/seq.el (seq-position): Autoload.

Fix docstrings in tramp.el

* lisp/net/tramp.el (tramp-antispoof-regexp)
(tramp-file-name-handler): Fix docstring.

Change default to cancel all edebug-on-entry in cancel-edebug-on-entry

* lisp/emacs-lisp/edebug.el (cancel-edebug-on-entry): Make the
default to cancel all edebug-on-entry.

Use user-error in cancel-edebug-on-entry

* lisp/emacs-lisp/edebug.el (cancel-edebug-on-entry): This is a
user-class error, so use user-error.

Instrument function if it hasn't been already in edebug-set-breakpoint

* lisp/emacs-lisp/edebug.el (edebug-set-breakpoint): Instrument
form automatically when using this function (bug#23469).

Fix up previous edebug breakpoint overlay change

* lisp/emacs-lisp/edebug.el (edebug--overlay-breakpoints): Only
make the overlays in edebug mode, so that we remove them when we
exit.

Mark breakpoints in edebug with highlights

* lisp/emacs-lisp/edebug.el (edebug--overlay-breakpoints)
(edebug--overlay-breakpoints-remove): New functions (bug#23468).
(edebug-modify-breakpoint): Use them to highlight breakpoints.
(edebug--display-1): Restore breakpoint highlights.
(edebug--recursive-edit): Remove highlights on exit.

lisp/*.el: Fix typos and improve some docstrings

* lisp/auth-source.el (auth-source-backend-parse-parameters)
(auth-source-search-collection)
(auth-source-secrets-listify-pattern)
(auth-source--decode-octal-string, auth-source-plstore-search):
* lisp/registry.el (registry-lookup)
(registry-lookup-breaks-before-lexbind)
(registry-lookup-secondary, registry-lookup-secondary-value)
(registry-search, registry-delete, registry-size, registry-full)
(registry-insert, registry-reindex, registry-prune)
(registry-collect-prune-candidates):
* lisp/subr.el (nbutlast, process-live-p):
* lisp/tab-bar.el (tab-bar-list):
* lisp/cedet/ede/linux.el (ede-linux--get-archs)
(ede-linux--include-path, ede-linux-load):
* lisp/erc/erc-log.el (erc-log-all-but-server-buffers):
* lisp/erc/erc-pcomplete.el (pcomplete-erc-commands)
(pcomplete-erc-ops, pcomplete-erc-not-ops, pcomplete-erc-nicks)
(pcomplete-erc-all-nicks, pcomplete-erc-channels)
(pcomplete-erc-command-name, pcomplete-erc-parse-arguments):
* lisp/eshell/em-term.el (eshell-visual-command-p):
* lisp/gnus/gnus-cache.el (gnus-cache-fully-p):
* lisp/gnus/nnmail.el (nnmail-get-active)
(nnmail-fancy-expiry-target):
* lisp/mail/mail-utils.el (mail-string-delete):
* lisp/mail/supercite.el (sc-hdr, sc-valid-index-p):
* lisp/net/ange-ftp.el (ange-ftp-use-smart-gateway-p):
* lisp/net/nsm.el (nsm-save-fingerprint-maybe)
(nsm-network-same-subnet, nsm-should-check):
* lisp/net/rcirc.el (rcirc-looking-at-input):
* lisp/net/tramp-cache.el (tramp-get-hash-table):
* lisp/net/tramp-compat.el (tramp-compat-process-running-p):
* lisp/net/tramp-smb.el (tramp-smb-get-share)
(tramp-smb-get-localname, tramp-smb-read-file-entry)
(tramp-smb-get-cifs-capabilities, tramp-smb-get-stat-capability):
* lisp/net/zeroconf.el (zeroconf-list-service-names)
(zeroconf-list-service-types, zeroconf-list-services)
(zeroconf-get-host, zeroconf-get-domain)
(zeroconf-get-host-domain):
* lisp/nxml/rng-xsd.el (rng-xsd-compile)
(rng-xsd-make-date-time-regexp, rng-xsd-convert-date-time):
* lisp/obsolete/erc-hecomplete.el (erc-hecomplete)
(erc-command-list, erc-complete-at-prompt):
* lisp/org/ob-scheme.el (org-babel-scheme-get-buffer-impl):
* lisp/org/ob-shell.el (org-babel--variable-assignments:sh-generic)
(org-babel--variable-assignments:bash_array)
(org-babel--variable-assignments:bash_assoc)
(org-babel--variable-assignments:bash):
* lisp/org/org-clock.el (org-day-of-week):
* lisp/progmodes/cperl-mode.el (cperl-char-ends-sub-keyword-p):
* lisp/progmodes/gud.el (gud-find-c-expr, gud-innermost-expr)
(gud-prev-expr, gud-next-expr):
* lisp/textmodes/table.el (table--at-cell-p, table--probe-cell)
(table--get-cell-justify-property)
(table--get-cell-valign-property)
(table--put-cell-justify-property)
(table--put-cell-valign-property): Fix typos.

* lisp/so-long.el (fboundp): Doc fix.
(so-long-mode-line-info, so-long-mode)
(so-long--check-header-modes): Fix typos.

* lisp/emulation/viper-mous.el (viper-surrounding-word)
(viper-mouse-click-get-word): Fix typos.
(viper-mouse-click-search-word): Doc fix.

* lisp/erc/erc-backend.el (erc-forward-word, erc-word-at-arg-p)
(erc-bounds-of-word-at-point): Fix typos.
(erc-decode-string-from-target, define-erc-response-handler):
Refill docstring.

* lisp/erc/erc-dcc.el (pcomplete/erc-mode/DCC): Fix typo.
(erc-dcc-get-host, erc-dcc-auto-mask-p, erc-dcc-get-file):
Doc fixes.

* lisp/erc/erc-networks.el (erc-network-name): Fix typo.
(erc-determine-network): Refill docstring.

* lisp/net/dbus.el (dbus-list-hash-table)
(dbus-string-to-byte-array, dbus-byte-array-to-string)
(dbus-check-event): Fix typos.
(dbus-introspect-get-property): Doc fix.

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler):
Rename ARGS to ARGUMENTS.  Doc fix.
(tramp-adb-sh-fix-ls-output, tramp-adb-execute-adb-command)
(tramp-adb-find-test-command): Fix typos.

* lisp/net/tramp.el (tramp-set-completion-function)
(tramp-get-completion-function)
(tramp-completion-dissect-file-name)
(tramp-completion-dissect-file-name1)
(tramp-get-completion-methods, tramp-get-completion-user-host)
(tramp-get-inode, tramp-get-device, tramp-mode-string-to-int)
(tramp-call-process, tramp-call-process-region)
(tramp-process-lines): Fix typos.
(tramp-interrupt-process): Doc fix.

* lisp/org/ob-core.el (org-babel-named-src-block-regexp-for-name)
(org-babel-named-data-regexp-for-name): Doc fix.
(org-babel-src-block-names, org-babel-result-names): Fix typos.

* lisp/progmodes/inf-lisp.el (lisp-input-filter): Doc fix.
(lisp-fn-called-at-pt): Fix typo.

* lisp/progmodes/xref.el (xref-backend-identifier-at-point):
Doc fix.
(xref-backend-identifier-completion-table): Fix typo.

New command edebug-remove-instrumentation

* doc/lispref/edebug.texi (Instrumenting): Document it.

* lisp/emacs-lisp/edebug.el (edebug-remove-instrumentation): New
command (bug#15843).

Fix doc string and interactive spec of cancel-edebug-on-entry

* lisp/emacs-lisp/edebug.el (cancel-edebug-on-entry): Add doc
string and make the interactive spec complete over functions that
have the spec (bug#10806).
(edebug-cancel-edebug-on-entry): Add alias for discoverability.
(edebug-on-entry): Clarify what this command does.

Revert "Add an edebug-cancel-debug-on-entry alias"

This reverts commit cea9577b7d6fcf01599afd48078f8ff1defb1297.

cancel-edebug-on-entry and cancel-debug-on-entry are not the same functions.

Add an edebug-cancel-debug-on-entry alias

* lisp/emacs-lisp/debug.el (edebug-cancel-debug-on-entry): Add an
alias for easier discoverability (bug#10806).

Protect against invalid punycode

* lisp/net/puny.el (puny-decode-string): Protect against invalid
punycode.

* lisp/net/eww.el (eww-browse-url-new-window-is-tab): New defcustom.

(eww-open-in-new-buffer, eww-browse-url): Use new defcustom (bug#37592).

Use 'C-x t' for tab-prefix-map instead of 'C-x 6' still used by 2C-mode-map.

* doc/emacs/commands.texi (Keys): Add 'C-x t'.
* doc/emacs/frames.texi (Tab Bars): Replace 'C-x 6' with 'C-x t'.
* doc/lispref/keymaps.texi (Prefix Keys): Add 'C-x t' (tab-prefix-map).
* doc/lispref/maps.texi (Standard Keymaps): Add tab-prefix-map, tab-bar-map.

* lisp/dired.el: Rebind 'C-x 6 d' to 'C-x t d'.  Use tab-prefix-map.

* lisp/subr.el (ctl-x-6-map, ctl-x-6-prefix, ctl-x-t-prefix): Remove.
(tab-prefix-map): New keymap bound to 'C-x t'.

* lisp/tab-bar.el: Use tab-prefix-map instead of ctl-x-6-map.

* lisp/textmodes/two-column.el: Restore autoload global setting of
"\C-x6" to 2C-command.

* lisp/ldefs-boot.el: Update to add setting "\C-x6" to 2C-command.

* doc/emacs/commands.texi (Keys):
* doc/emacs/text.texi (Two-Column):
* doc/lispref/keymaps.texi (Prefix Keys):
* doc/lispref/maps.texi (Standard Keymaps):
Restore 'C-x 6' bound to '2C-mode-map'.

Add ':extend t' face attribute to diff faces (bug#37774)

* lisp/vc/diff-mode.el (diff-header, diff-file-header)
(diff-removed, diff-added): Add ':extend t' face attribute.

* lisp/vc/ediff-init.el (ediff-current-diff-A)
(ediff-current-diff-B, ediff-current-diff-C)
(ediff-current-diff-Ancestor, ediff-even-diff-A)
(ediff-even-diff-B, ediff-even-diff-C, ediff-even-diff-Ancestor)
(ediff-odd-diff-A, ediff-odd-diff-B, ediff-odd-diff-C)
(ediff-odd-diff-Ancestor): Add ':extend t' face attribute.

* lisp/vc/smerge-mode.el (smerge-upper, smerge-lower)
(smerge-base, smerge-markers): Add ':extend t' face attribute.

* lisp/vc/log-view.el (log-view-file, log-view-message):
Add ':extend t' face attribute.

* lisp/faces.el (secondary-selection): Add ':extend t' face attribute.
(line-number-major-tick, line-number-minor-tick):
Change :foreground to :background.

* lisp/net/tramp.el (tramp-antispoof-regexp): Fix version.

Don't downcase the key binding in global-set-key.

This fixes bug #37769.

* lisp/subr.el (global-set-key): Provide a non-nil DONT-DOWNCASE argument to
read-key-sequence.

* etc/NEWS: Add an entry for this change.

Fix a recent change in Emacs FAQ

* doc/misc/efaq.texi (New in Emacs 23, Common requests):
Remove references to the removed section "Highlighting a
region".

* doc/emacs/emacs.texi (Intro): Mention remote file editing.

Don't explain FTP acronym in FAQ

* doc/misc/efaq.texi (Common acronyms): Remove explanation of the FTP
acronym.  Emacs is no longer distributed over FTP, and the FAQ doesn't
refer to any other FTP URLs.

Remove FAQ section "Highlighting a region" (Bug#37818)

* doc/misc/efaq.texi (Highlighting a region): Remove section.

Support PuTTY's antispoof message in Tramp

* lisp/net/tramp-sh.el (tramp-actions-before-shell):
Add respective entry for PuTTY's antispoof message.

* lisp/net/tramp.el (tramp-antispoof-regexp): New defcustom.
(tramp-action-confirm-message): New defun.

Fix optional parameter passing in calc-fin-* functions

* lisp/calc/calc-fin.el (calc-fin-pv, calc-fin-fv, calc-fin-pmt)
(calc-fin-pner, calc-fin-rate): Add support for an optional
parameter standing for an initial lump. The functions already
support it but the extra parameter was not taken into account in
stack mode. This commit it takes into consideration when deciding
if a function takes 3 or 4 parameters (bug#37649).

Remove some compat code from cperl-mode.el

* lisp/progmodes/cperl-mode.el: Remove old-Emacs compat code.

Fix display of Info files on TTY frames

* lisp/info.el (info-symbols-and-replacements): New variable.
(Info-mode): Use 'info-symbols-and-replacements' to set up a
buffer-display-table for non-ASCII symbols used by Info files
that cannot be displayed on TTY frames.

Remove some compat code from CEDET

* lisp/cedet/semantic.el (pp):
* lisp/cedet/semantic/complete.el (initialize-instance): Remove
old-Emacs compat code.

Remove some compat code from mm-url.el

* lisp/gnus/mm-url.el (mm-url-use-external): Remove old-Emacs
compat code.

Remove compat code from nnbabyl.el

* lisp/gnus/nnbabyl.el (rmail): Remove old-Emacs compat code.

Remove some compat code in imap.el

* lisp/net/imap.el (imap-sasl-auth-p): Remove old-Emacs compat code.

special-mode doc string clarification

* lisp/simple.el (special-mode): Make the doc string explain what
special modes are for (bug#37787).

Don't have shr bug out if svg support isn't available

* lisp/net/shr.el (shr-put-image): Don't bug out if SVG support
isn't available.

Fix typo in tree-widget-lookup-image

* lisp/tree-widget.el (tree-widget-lookup-image): Fix typo
introduced by previous cleanup (bug#37809).

A better fix for tab-line mouse highlight on TTY frames

* src/dispnew.c (mode_line_string):
* src/xdisp.c (note_mode_line_or_margin_highlight): Remove
recently-added workarounds for incorrect TTY mouse highlight:
they are no longer needed.
(mark_window_display_accurate_1): Set the header_line_p and
tab_line_p flags of the window's current_matrix if the window
displays these.
(display_mode_line): Set the header_line_p and tab_line_p
flags of the window's desired_matrix if the window displays
these.  (Bug#37807)

Remove XEmacs compat code from ezimage.el

* lisp/ezimage.el (top-level): Remove XEmacs compat code.

Pacify x86 GCC 9 in tab bar code

* src/xdisp.c (tty_get_tab_bar_item): Simplify a bit.  This
pacifies --enable-gcc-warnings with x86 GCC 9.2.1 20190827
(Red Hat 9.2.1-1) when combined with -fsanitize=undefined.