Prevent subprocess hangs in xwidget

* src/xwidget.c (Fmake_xwidget, Fxwidget_webkit_goto_url): Use
`catch_child_signal' instead of trying to preserve the previous
signal handler.

Use substitute-command-keys in some messages

* lisp/dired.el (dired-get-file-for-visit):
* lisp/doc-view.el (doc-view-buffer-message):
* lisp/help.el (help-window-setup):
* lisp/ibuf-ext.el (ibuffer-do-kill-lines):
* lisp/vc/ediff.el (ediff-documentation): Use 'substitute-command-keys'.

Don't draw xwidgets that have just been resized

This serves to eliminate the huge black bar displayed when the
offscreen widget has been resized (and as such the damage event
signal is sent), but the X window hasn't.

* src/xwidget.c (xv_do_draw): Don't draw xwidgets that have
just been resized.
(x_draw_xwidget_glyph_string)
(xwidget_init_view): Clear just_resized.

(Fxwidget_resize): Set just_resized first, then queue allocate.

Ignore some externally maintained files in AUTHORS

* admin/authors.el (authors-ignored-files): Ignore externally
maintained files.

* lisp/image-dired.el: Remove unnecessary 'declare-function'.

; * admin/MAINTAINERS: Add myself.

Change the call signature to keymap-substitute

* lisp/keymap.el (keymap-substitute): Make the keymap the first
parameter for symmetry with the other functions.
* lisp/emacs-lisp/shortdoc.el (keymaps):
* lisp/emacs-lisp/bytecomp.el (lambda): Adjust.

Merge from origin/emacs-28

fa0b34b716 * admin/authors.el (authors-ignored-files): Ignore some NE...
c25be3e7bb * lisp/tab-bar.el (tab-bar-select-tab): Add check for wc-f...
38d905abf9 * lisp/tab-bar.el: Doc fixes for commands bound to modifie...

Make bookmark-set prompt less confusing

* lisp/bookmark.el (bookmark-set): Make the prompt less confusing
(bug#51876).

Fix mh-mime build problem

* lisp/mh-e/mh-mime.el (mh-acros): Require to get mh-dlet*.

Temporarily mark two failing tests as unstable

* test/lisp/mh-e/mh-utils-tests.el
(mh-folder-completion-function-08-plus-slash)
(mh-folder-completion-function-09-plus-slash-tmp): Temporarily
mark two failing tests as unstable.

; * admin/automerge: Maintain.

Fix bookmark-bmenu-mode-map syntax

* lisp/bookmark.el (bookmark-bmenu-mode-map): Fix syntax in defvar-keymap.

Remove some references to XEmacs

* lisp/emulation/viper-cmd.el (viper-start-R-mode):
* lisp/emulation/viper-init.el (viper-window-display-p):
* lisp/emulation/viper-mous.el (viper-surrounding-word):
* lisp/mail/footnote.el (footnote-mode):
* lisp/textmodes/reftex-index.el: Remove some comments referring to
XEmacs.

Make mh-funcall-if-exists obsolete

* lisp/mh-e/mh-acros.el (mh-funcall-if-exists): Make obsolete.
* lisp/mh-e/mh-alias.el (mh-read-address):
* lisp/mh-e/mh-folder.el (mh-folder-mode):
* lisp/mh-e/mh-mime.el (mh-mm-display-part):
* lisp/mh-e/mh-show.el (mh-defun-show-buffer):
* lisp/mh-e/mh-speed.el (mh-speedbar-change-expand-button-char):
* lisp/mh-e/mh-tool-bar.el (mh-tool-bar-define):
* lisp/mh-e/mh-utils.el (mh-logo-display):
* lisp/mh-e/mh-xface.el (mh-face-display-function): Don't use
above obsolete macro.

Convert keymaps in bookmark.el to defvar-keymap

* lisp/bookmark.el (bookmark-map)
(bookmark-minibuffer-read-name-map)
(bookmark-edit-annotation-mode-map, bookmark-bmenu-mode-map):
Convert to defvar-keymap.

* lisp/rot13.el (rot13-translate-table): Make it a `translation-table`

(rot13-display-table): Use `dotimes`.

* admin/authors.el (authors-ignored-files): Ignore some NEWS files.

* admin/gitmerge.el (gitmerge-mode-map): Convert to defvar-keymap.

Update xwidget webkit history buffer more eagerly

* lisp/xwidget.el (xwidget-webkit-callback): Update history
buffer on each load-changed event.

Only set LANG if the ID is valid

* src/nsterm.m (ns_init_locale): Check the provided locale identifier
is available before trying to use it.

* lisp/tab-bar.el (tab-bar-select-tab): Add check for wc-frame (bug#51883).

* lisp/tab-bar.el: Doc fixes for commands bound to modifier keys.

(tab-bar-select-tab-modifiers)
(tab-bar-select-tab, tab-bar-switch-to-last-tab): Doc fixes.

Make keymap-unset work

* lisp/keymap.el (keymap-unset): Fix key syntax (bug#51897).

Put back documentation of legacy keymap functions

* doc/lispref/keymaps.texi (Low-Level Key Binding): Reinstate
documentation of legacy commands and functions.

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

Minor copyedits of recent documentation changes

* doc/lispref/keymaps.texi (Low-Level Key Binding): Minor changes
in wording and markup.

Some minor Tramp updates

* lisp/net/tramp-crypt.el (tramp-crypt-add-directory): Add comment.

* lisp/net/tramp.el (tramp-debug-buffer-command-completion-p)
(tramp-setup-debug-buffer): New defuns.
(tramp-get-debug-buffer): Call `tramp-setup-debug-buffer.

* test/lisp/net/tramp-tests.el (tramp-test07-abbreviate-file-name):
Extend test.

Fix compilation error in previous keymap.c change

* src/keymap.c (initial_define_lispy_key, define_as_prefix): Fix
--enable-checking error.

Lower xwidget views owned by parent when lowering frame

* src/xterm.c (x_lower_frame): Lower parent frame's xwidget
views as well.

* src/xwidget.h (lower_frame_xwidget_views):
* src/xwidget.c (lower_frame_xwidget_views): New function.

Add command to browse xwidget history

* doc/emacs/misc.texi (Embedded WebKit Widgets)
* etc/NEWS: Document `xwidget-webkit-browse-history'.

* lisp/xwidget.el (xwidget-webkit-mode-map): Bind "H" to
xwidget-webkit-browse-history.
(xwidget-webkit-import-widget): Set last session buffer correctly.
(xwidget-webkit-browse-history): New command.
(xwidget-webkit-history--session): New variable.

(xwidget-webkit-history--insert-item)
(xwidget-webkit-history-select-item)
(xwidget-webkit-history-reload): New functions.

(xwidget-webkit-history-mode): New major mode.

New X resource to control the border thickness of menus

* lwlib/xlwmenu.h (XtNborderThickness, XtCBorderThickness): New X
resource name.
* lwlib/xlwmenuP.h (XlwMenuPart): New border_thickness field.
* lwlib/xlwmenu.c (xlwMenuResources): Access the new resource.
(draw_shadow_rectangle): Use the new resource value.
* doc/emacs/xresources.texi (Lucid Resources): Document the new
resource (bug#51867).

Make results details in ert-run-tests-batch configurable

* lisp/emacs-lisp/ert.el (ert-batch-print-length)
(ert-batch-print-level,.ert-batch-backtrace-line-length)
(ert-batch-test, ert-run-tests-interactively): Added the three
variables, bound them to these settings when formatting batch
test results including backtraces. Removed the optional
parameters output-buffer & message-fn from
ert-run-tests-interactively.
* test/lisp/emacs-lisp/ert-tests.el
(ert-test-run-tests-interactively, ert-test-run-tests-batch): use
cl-letf to capture output, new tests resp.
* test/lisp/ert-x-tests.el (ert-test-run-tests-interactively-2):
Changed to use cl-letf to capture output instead of using
message-fn.
* lisp/emacs-lisp/backtrace.el (backtrace--line-length-or-nil)
(backtrace--print-func-and-args): Fixed a bug when setting
backtrace-line-length to nil by adding a new function to check
for that case & having backtrace--print-func-and-args use it.
* doc/misc/ert.texi: document the new variables & their usage
(bug#51037).

Start adjusting the manuals to talk about the keymap-* functions

* lisp/dired.el (dired--make-directory-clickable):
* doc/lispref/keymaps.texi (Keymaps):
(Key Sequences):
(Prefix Keys):
(Active Keymaps):
(Key Lookup):
(Functions for Key Lookup):
(Changing Key Bindings):
(Key Binding Commands):
(Tool Bar):
* doc/lispref/commands.texi (Interactive Codes):
(Event Examples):
(Event Mod):
* doc/emacs/kmacro.texi (Save Keyboard Macro):
* doc/emacs/custom.texi (Keymaps):
(Keymaps):
(Minibuffer Maps):
(Rebinding):
(Init Rebinding):
(Modifier Keys):
(Mouse Buttons):
(Init Examples):
(Init Non-ASCII): Adjust the documentation to remove description
of the old syntaxes, and use the new keymap-* functions.

* doc/lispref/keymaps.texi (Low-Level Key Binding): New node that
describes `define-key' and the old key syntaxes.

Adjust `defvar-keymap' and `define-keymap' to the new syntax

* lisp/vc/smerge-mode.el (smerge-basic-map):
* lisp/vc/pcvs.el (cvs-mode-map):
(cvs-minor-mode-prefix):
* lisp/vc/log-view.el (log-view-mode-map):
* lisp/vc/log-edit.el (log-edit-mode-map):
* lisp/vc/diff-mode.el (diff-mode-shared-map):
(diff-minor-mode-prefix):
* lisp/vc/cvs-status.el (cvs-status-mode-map):
* lisp/simple.el (special-mode-map):
* lisp/outline.el (outline--insert-open-button):
(outline--insert-close-button):
* lisp/net/shr.el (shr-map):
* lisp/net/eww.el (eww-link-keymap):
(eww-mode-map):
(eww-submit-map):
(eww-bookmark-mode-map):
(eww-history-mode-map):
(eww-buffers-mode-map):
* lisp/mh-e/mh-speed.el (:keymap):
* lisp/mh-e/mh-show.el (:keymap):
* lisp/mh-e/mh-search.el (:keymap):
* lisp/mh-e/mh-letter.el (:keymap):
* lisp/mh-e/mh-folder.el (:keymap):
* lisp/international/emoji.el (emoji-list-mode-map):
* lisp/gnus/spam.el (:keymap):
* lisp/gnus/mml.el (mml-mode-map):
* lisp/gnus/message.el (message-mode-map):
* lisp/gnus/gnus-undo.el (gnus-undo-mode-map):
* lisp/gnus/gnus-topic.el (gnus-topic-mode-map):
* lisp/gnus/gnus-sum.el (:keymap):
* lisp/gnus/gnus-srvr.el (gnus-server-mode-map):
(gnus-browse-mode-map):
* lisp/gnus/gnus-salt.el (gnus-pick-mode-map):
(gnus-tree-mode-map):
* lisp/gnus/gnus-msg.el (:prefix):
* lisp/gnus/gnus-ml.el (gnus-mailing-list-mode-map):
* lisp/gnus/gnus-kill.el (gnus-kill-file-mode-map):
* lisp/gnus/gnus-html.el (gnus-html-displayed-image-map):
* lisp/gnus/gnus-group.el (:keymap):
* lisp/gnus/gnus-eform.el (gnus-edit-form-mode-map):
* lisp/gnus/gnus-draft.el (gnus-draft-mode-map):
* lisp/gnus/gnus-dired.el (gnus-dired-mode-map):
* lisp/gnus/gnus-bookmark.el (gnus-bookmark-bmenu-mode-map):
* lisp/gnus/gnus-art.el (:keymap):
(gnus-article-edit-mode-map):
* lisp/gnus/gnus-agent.el (gnus-agent-group-mode-map):
(gnus-agent-summary-mode-map):
(gnus-agent-server-mode-map):
(gnus-category-mode-map): Adjust `defvar-keymap' and
`define-keymap' to the new syntax.

Add new 'keymap-*' functions

* lisp/keymap.el: New file with all the new keymap-* functions.

* lisp/loadup.el ("keymap"): Load.

* lisp/subr.el (kbd): Refactor out all the code to key-parse.
(define-key-after, keyboard-translate, global-set-key)
(local-set-key, global-unset-key, local-unset-key)
(local-key-binding, global-key-binding)
(substitute-key-definition): Note in doc strings that these are
legacy functions.
(define-keymap--define): Use keymap-set.

* lisp/emacs-lisp/byte-opt.el: Remove the optimizations for
defvar-keymap and define-keymap since the macros now only
understand the kbd syntax.
* lisp/emacs-lisp/bytecomp.el (byte-compile-define-keymap)
(byte-compile-define-keymap--define): Warn about invalid key
definitions in all keymap-* functions.

* lisp/emacs-lisp/shortdoc.el (keymaps): Add shortdocs form
keymap* functions.

* src/keymap.c (possibly_translate_key_sequence): Adjust callers
to key-valid-p and key-parse.
(syms_of_keymap): Adjust defs.

Allow removing keymap definitions

* src/keymap.c (initial_define_lispy_key): Adjust caller.
(store_in_keymap): Allow removing definitions in addition to
setting them to nil.
(Fdefine_key): Ditto.
(define_as_prefix): Adjust caller.

* src/term.c (term_get_fkeys_1): Adjust caller.

Make erc-mode noninteractive

* lisp/erc/erc.el (erc-mode): Mark it as noninteractive, because
using it from `M-x' will only lead to problems (bug#51841).

Merge from origin/emacs-28

e852822f3d Fix removal of fringe marks of deleted bookmarks
b418aad85a * lisp/repeat.el (repeat-echo-message): Bind message-log-m...
fe2ac7cb7c * lisp/repeat.el (describe-repeat-maps): Use help-fns--ana...
c840bfe7e1 * lisp/repeat.el: Detect changes in the minibuffer state (...
5044151486 Avoid segfaults due to freed face cache
199e2468d3 Doc fix; change recommended file name of custom-file

Fix handling of folder "+/" in MH-E

* lisp/mh-e/mh-utils.el (mh-sub-folders): Fix handling of "+/".
* test/lisp/mh-e/mh-utils-tests.el
(mh-folder-completion-function-08-plus-slash)
(mh-folder-completion-function-09-plus-slash-tmp):
Fix errors made importing tests from mh-unit.el; remove declaration
that these tests are expected to fail.

Fix checkdoc complaints in MH-E

* lisp/mh-e/mh-compat.el (mh-flet): Rewrite most of the docstring.
(mh-write-file-functions): Remove trailing space.
* lisp/mh-e-mh-scan.el (mh-scan-cmd-note-width): Break up a
line that was too long.

Fix recently changed wdired test on MS-Windows

* test/lisp/wdired-tests.el (wdired-test-bug34915): Don't try to
create a local socket on MS-Windows, as it is not supported on that
platform.  Problem reported by Robert Pluim <rpluim@gmail.com>.

Prevent xwidget windows from obscuring child frames

* src/xwidget.c (x_draw_xwidget_glyph_string): Lower view window
when creating it.

Fix xwidget isearch for queries that look like format strings

* lisp/xwidget.el (xwidget-webkit-isearch--update): Give special
treatment to messages.

Fix documentation string

* src/xwidget.c (Vxwidget_list, Vxwidget_views_list): Fix
horrid doc string.

Fix removal of fringe marks of deleted bookmarks

* lisp/bookmark.el (bookmark--remove-fringe-mark): The fringe
overlay is at BOL, not at POS.  (Bug#51233)

* lisp/repeat.el (repeat-echo-message): Bind message-log-max to nil.

Don't insert messages about repeatable keys in the *Messages* buffer.

* lisp/repeat.el (describe-repeat-maps): Use help-fns--analyze-function.

Print keys bound to commands in every keymap (bug#49265)

* lisp/repeat.el: Detect changes in the minibuffer state (bug#47566)

(repeat--prev-mb): New internal variable.
(repeat-post-hook): Check the property 'repeat-map' on the symbol
from 'this-command' in addition to 'real-this-command'.  Don't allow
repeatable maps in the activated minibuffer or in the minibuffer
from another command.  Set 'repeat--prev-mb' at the end.

Fix minor problems resulting from Tramp regression tests

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist):
* lisp/net/tramp-archive.el (tramp-archive-file-name-handler-alist):
* lisp/net/tramp-crypt.el (tramp-crypt-file-name-handler-alist):
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
* lisp/net/tramp-rclone.el (tramp-rclone-file-name-handler-alist):
* lisp/net/tramp-sshfs.el (tramp-sshfs-file-name-handler-alist):
Add comment.

* lisp/net/tramp-cache.el (tramp-flush-file-upper-properties):
FILE can be "~".

* lisp/net/tramp.el ('tramp-ensure-dissected-file-name):
Add `tramp-suppress-trace' property.
(tramp-get-debug-buffer): Add local key for debugging.
(tramp-handle-abbreviate-file-name): Adapt implementation.

* test/lisp/net/tramp-tests.el
(tramp-test07-abbreviate-file-name):
Adapt test.
(tramp-test17-insert-directory-one-file)
(tramp--test-check-files): Use proper `no-dir' argument for
`dired-get-filename'.

Avoid segfaults due to freed face cache

* src/xfaces.c (face_at_buffer_position): Make sure DEFAULT_FACE
is usable.  (Bug#51864)

Add another 'abbreviate-file-name' test

* test/lisp/files-tests.el
(files-tests-file-name-non-special-abbreviate-file-name): New test.

Support abbreviating home directory of Tramp filenames

* doc/lispref/files.texi (Magic File Names): Mention
'abbreviate-file-name' in the list of magic file name handlers.

* etc/NEWS: Announce the change.

* lisp/files.el (file-name-non-special):
* lisp/net/tramp.el (tramp-file-name-for-operation):
* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist):
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-file-name-handler-alist):
Add 'abbreviate-file-name'.

* lisp/files.el (directory-abbrev-make-regexp):
(directory-abbrev-apply): New functions.
(abbreviate-file-name): Check for file name handler.

* test/lisp/net/tramp-tests.el (tramp-test07-abbreviate-file-name):
New test.

Doc fix; change recommended file name of custom-file

* lisp/cus-edit.el (custom-file): Change file name recommendation to
match Info node '(emacs) Saving Customizations'.

Fix hanging wdired test

* test/lisp/wdired-tests.el (wdired-test-bug34915): Fix hanging
test.  Don't start the Emacs Server just to create a socket; just
create the socket manually.

Fix outline-cycle-buffer issue in `C-h b' buffers

* lisp/outline.el (outline--fix-up-all-buttons): Fix issue when
called after collapsing a buffer (bug#51855).

Allow mm-external-terminal-program to be a list of strings

* doc/misc/emacs-mime.texi (Display Customization): Document it.

* lisp/gnus/mm-decode.el (mm-external-terminal-program): Allow
being a list.

Fix handling of changed prefix keys in tutorial

* lisp/tutorial.el (tutorial--find-changed-keys): Use keymapp to
detect prefix definitions rather than hard-coding them.  A notable
omission from the hard-coded list was mode-specific-command-prefix,
whose subcommands are often rebound (bug#40725).

Merge from origin/emacs-28

044dd1e210 * rcirc.el (rcirc-define-command): Fix interactive-spec ge...

; Merge from origin/emacs-28

The following commit was skipped:

97059bcdff Fix `C-h k' in gnus-article-mode (don't merge)

Merge from origin/emacs-28

85ac0efe7c Fix semantic-symref-perform-search doc string

Fix xwidget-webkit-back-forward-list

* src/xwidget.c (Fxwidget_webkit_back_forward_list): Use correct
list variable in loop.

Stop assuming xwidget views will only be displayed in TEXT_AREA

* src/xterm.c (x_scroll_run): Use view->area when calculating
xwidget view clipping.

* src/xwidget.c (x_draw_xwidget_glyph_string): Set view->area
to s->area and use that instead.

* src/xwidget.h (struct xwidget_view): Add glyph row area field.

Prefer POSIX timers to timerfd timers

* src/atimer.c (set_alarm): Try to start a POSIX timer before
starting a timerfd timer.  On Cygwin, return if the POSIX timer is
started successfully. (Bug#51734)

* rcirc.el (rcirc-define-command): Fix interactive-spec generation

* rcirc.el (rcirc-define-command):  Wrap interactive spec in a list call.

* lisp/tab-line.el (tab-line-mode): Preserve existing value of tab-line-format

Keep the old value of tab-line-format when enabling tab-line-mode
and don't overwrite it with nil when disabling tab-line-mode (bug#51830).

* src/lread.c (read_escape): Fix handling of ?\C-<char> for chars 128-255

Fix `C-h k' in gnus-article-mode (don't merge)

* lisp/gnus/gnus-art.el (gnus-article-describe-key):
(gnus-article-describe-key-briefly): Fix `describe-key' calling
convention (bug#51796).

; Revert "* lisp/progmodes/python.el (python-forward-sexp-function): :version fix."

This reverts commit e6e29b435273ee9821b6536581bd151f3e50737d.
The commit was a mistake.

; * lisp/progmodes/python.el (python-forward-sexp-function): :version fix.

Fix recent documentation updates

* doc/lispref/text.texi (Special Properties): Improve wording.
Add cross-reference and index entry.
(Sticky Properties): Add indexing.

Fix semantic-symref-perform-search doc string

* lisp/cedet/semantic/symref/cscope.el (semantic-symref-perform-search):
Fix the docstring to refer to the correct tool (bug#51846).

Improve Tramp error handling

* doc/misc/tramp.texi (Frequently Asked Questions): Add another
`remote-file-error'.

* lisp/net/tramp.el (tramp-find-foreign-file-name-handler):
Improve error handling.

; Merge from origin/emacs-28

The following commit was skipped:

289f3a9 Add more files to be natively-compiled AOT

Merge from origin/emacs-28

5dbad52 gnus-summary-line-format doc string clarification
d4536ff Fix follow-scroll-down in a small buffer which starts slightl...

; Merge from origin/emacs-28

The following commits were skipped:

4802419 Fix compilation on MS-Windows
cc4edea Use posix_spawn if possible.

Merge from origin/emacs-28

a56dd60 Improve style and comments in font-related sources

Add more files to be natively-compiled AOT

* src/Makefile.in (elnlisp): Add emacs-lisp/gv.eln and other
missing dependencies of comp.el.

Expose xwidget navigation history to Lisp code

* doc/lispref/display.texi (Xwidgets): Document changes.
* etc/NEWS: Announce new function.
* src/xwidget.c (Fxwidget_webkit_back_forward_list): New
function.
(syms_of_xwidget): Define new subr.

Add `kill-xwidget'

* doc/lispref/display.texi (Xwidgets): Document 'kill-xwidget'.
* src/xwidget.c (kill_xwidget, Fkill_xwidget): New function.
(syms_of_xwidget): Define new subr.
(kill_buffer_xwidgets): Use `kill_xwidget' instead.

Fix previous -responsible-p change

* lisp/vc/vc-sccs.el (vc-sccs-responsible-p):
* lisp/vc/vc-rcs.el (vc-rcs-responsible-p):
* lisp/vc/vc-cvs.el (vc-cvs-responsible-p): Make the previous
change work with relative file names, too.

gnus-summary-line-format doc string clarification

* lisp/gnus/gnus.el (gnus-summary-line-format): Clarify the Date
part of the doc string (bug#51823).

Explain in the manual how to make `cursor-intangible' work

* doc/lispref/text.texi (Special Properties): Explain how to make
`cursor-intangible' work (bug#51095).

Fix crash in xwidget_end_redisplay

* src/xwidget.c (xwidget_end_redisplay): Always test if xv is
NULL.

Fix `C-h k' in gnus-article-mode

* lisp/gnus/gnus-art.el (gnus-article-describe-key):
(gnus-article-describe-key-briefly): Fix `describe-key' calling
convention (bug#51796).

Make all vc-*-responsible-p functions return a string

* lisp/vc/vc-sccs.el (vc-sccs-responsible-p):
* lisp/vc/vc-rcs.el (vc-rcs-responsible-p):
* lisp/vc/vc-dav.el (vc-dav-responsible-p):
* lisp/vc/vc-cvs.el (vc-cvs-responsible-p): Return a file name
instead of t when we get a match (which is what
vc-backend-for-registration expects) (bug#51800).

Fix customization group of python-forward-sexp-function

* lisp/progmodes/python.el (python-forward-sexp-function): Move from
the "Flymake integration" subsection to the "Navigation" subsection,
so that the option is sorted into the 'python' group rather than the
'python-flymake' group (bug#51807).

Fix Gnus gcc header tokenization

* lisp/gnus/gnus-msg.el (gnus-summary-resend-message-insert-gcc)
(gnus-inews-do-gcc): Fix tokenization of the gcc header.

Adjust build-dep-zips.py download link

* admin/nt/dist-build/build-dep-zips.py (download_source): Adjust
the download link (bug#40628).

Find most specific backend for `vc-backend-for-registration'.

* lisp/vc/vc.el (vc-backend-for-registration): Count file name
components instead of the length of the file name string (bug#50572).

Fix follow-scroll-down in a small buffer which starts slightly scrolled

This fixes bug #51814.

* lisp/follow.el (follow-scroll-down): Do away with the optimization of doing
vertical-motion over only one window.  Instead move over all windows, to
checck for being close to point-min, and setting point accordingly.

Fix compilation on MS-Windows

* src/callproc.c (emacs_spawn) <fork_done>: Define the label only
if USABLE_POSIX_SPAWN is defined, to avoid a compiler warning.

(cherry picked from commit a8fc08085110de00ebcbd67b5273a755a5cb8ea1)

Use posix_spawn if possible.

posix_spawn is less error-prone than vfork + execve, and can make
better use of system-specific enhancements like 'clone' on Linux.  Use
it if we don't need to configure a pseudoterminal.

Backported from commit a60053f8368e058229721f1bf1567c2b1676b239.
Unlike that commit, only define USABLE_POSIX_SPAWN on macOS, because
there posix_spawn is much faster than vfork.

Don't merge to master.

* configure.ac (HAVE_SPAWN_H, HAVE_POSIX_SPAWN)
(HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR)
(HAVE_POSIX_SPAWN_FILE_ACTIONS_ADDCHDIR_NP)
(HAVE_POSIX_SPAWNATTR_SETFLAGS, HAVE_DECL_POSIX_SPAWN_SETSID): New
configuration variables.
* src/callproc.c (USABLE_POSIX_SPAWN): New configuration macro.
(emacs_posix_spawn_init_actions)
(emacs_posix_spawn_init_attributes, emacs_posix_spawn_init): New
helper functions.
(emacs_spawn): Use posix_spawn if possible.

(cherry picked from commit a60053f8368e058229721f1bf1567c2b1676b239)

MH-E threads code: use mh-scan variables correctly

* lisp/mh-e/mh-thread.el (mh-thread-current-indentation-level)
(mh-thread-find-children): Fix off-by-one error by using
'mh-scan-field-from-start-offset' directly, as
'mh-thread-parse-scan-line' does.  Previously, these functions would
incorrectly consider the "date note" column as part of the thread
indenting.  Since that column is almost always a Space character, that
almost always worked.
(mh-thread-ancestor): Update caller.
* test/lisp/mh-e/mh-thread-tests.el: New unit tests for affected code.
* lisp/mh-e/mh-scan.el (mh-msg-num-width-to-column): Fix doc string typo.

Improve style and comments in font-related sources

* src/w32font.c (fill_in_logfont): Stylistic changes.
* src/font.h (font_property_index, font_select_entity):
Add/improve comments.

Revert accidential commit in icomplete.el

Remove Tramp's `dired-compress-file' handler, not needed anymore

* lisp/dired-aux.el (dired-check-process, dired-shell-command):
Call `dired-uncache'.
(dired-compress-file): Use `file-local-name'.

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist):
* lisp/net/tramp-archive.el (tramp-archive-file-name-handler-alist):
* lisp/net/tramp-crypt.el (tramp-crypt-file-name-handler-alist):
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist):
* lisp/net/tramp-rclone.el (tramp-rclone-file-name-handler-alist):
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist):
* lisp/net/tramp-sshfs.el (tramp-sshfs-file-name-handler-alist):
* lisp/net/tramp-sudoedit.el (tramp-sudoedit-file-name-handler-alist):
Remove superfluous comment.

* lisp/net/tramp-sh.el (dired-compress-file): Declare.
(tramp-sh-handle-dired-compress-file): Call real handler for
Emacs >= 29.

* lisp/net/tramp.el (tramp-file-name-for-operation): Reorder list.

* test/lisp/net/tramp-tests.el (tramp-test45-dired-compress-file)
(tramp-test45-dired-compress-dir): Adapt comment.

Fix scroll event test in handle_one_xevent

* src/xterm.c (handle_one_xevent): Test for scroll wheel button
correctly in xwidget code.

Fix font selection via :family on MS-Windows

* src/font.c (font_delete_unmatched) [HAVE_NTGUI]: Allow non-exact
matches of :weight when looking for a suitable font.  (Bug#51768)

Correct patch from 2021-11-12 on src/fileio.c

* src/fileio.c (restore_window_points): Reverse commit
974192413f8a81171b8fd28dfd5c081ce06d3dec and instead replace a < by a <=.
This ensures that if w->mpoint is at the top of the middle region being
replaced, it gets adjusted and stays at the top after the reinsertion.