GNU Emacs NEWS -- history of user-visible changes.

Copyright (C) 2021-2022 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 29.

See file HISTORY for a list of GNU Emacs versions and release dates.
See files NEWS.28, NEWS.27, ..., 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.

\f
* Installation Changes in Emacs 29.1

+++
** Emacs can be built with built-in support for accessing SQLite databases.
This uses the popular sqlite3 library, and can be disabled by using
the '--without-sqlite3' option to the 'configure' script.

+++
** Emacs has been ported to the Haiku operating system.
The configuration process should automatically detect and build for
Haiku.  There is also an optional window-system port to Haiku, which
can be enabled by configuring Emacs with the option '--with-be-app',
which will require the Haiku Application Kit development headers and a
C++ compiler to be present on your system.  If Emacs is not built with
the option '--with-be-app', the resulting Emacs will only run in
text-mode terminals.

+++
*** Cairo drawing support has been enabled for Haiku builds.
To enable Cairo support, ensure that the Cairo and FreeType
development files are present on your system, and configure Emacs with
'--with-be-cairo'.

---
*** Double buffering is now enabled on the Haiku operating system.
Unlike X, there is no compile-time option to enable or disable
double-buffering.  If you wish to disable double-buffering, change the
frame parameter 'inhibit-double-buffering' instead.

---
** Emacs now installs the ".pdmp" file using a unique fingerprint in the name.
The file is typically installed using a file name akin to
"...dir/libexec/emacs/29.1/x86_64-pc-linux-gnu/emacs-<fingerprint>.pdmp".
If a constant file name is required, the file can be renamed to
"emacs.pdmp", and Emacs will find it during startup anyway.

---
** Emacs now supports use of XInput 2 for input events.
If your X server has support and you have the XInput 2 development headers
installed, you can configure Emacs with the option '--with-xinput2' to enable
this support.

The named feature 'xinput2' can be used to test for the presence of
XInput 2 support from Lisp programs.

+++
** Emacs now supports being built with pure GTK.
To use this option, make sure the GTK 3 (version 3.20 or later) and
Cairo development files are installed, and configure Emacs with the
option '--with-pgtk'.  Unlike the default X and GTK build, the
resulting Emacs binary will work on any underlying window system
supported by GDK, such as Wayland and Broadway.  We do not recommend
that you use this configuration, unless you are running a window
system that's supported by GDK other than X.  Running this
configuration on X is known to have problems, such as undesirable
frame positioning and various issues with keyboard input of sequences
such as 'C-;' and 'C-S-u'.

---
** The docstrings of preloaded files are not in "etc/DOC" any more.
Instead, they're fetched as needed from the corresponding ".elc" file,
as was already the case for all the non-preloaded files.

** Emacs Sessions (Desktop)

+++
*** New option to load a locked desktop if locking Emacs is not running.
The option 'desktop-load-locked-desktop' can now be set to the value
'check-pid', which means to allow loading a locked ".emacs.desktop"
file if the Emacs process which locked it is no longer running on the
local machine.  This allows to avoid asking questions about locked
desktop files when the Emacs session which locked it crashes or was
otherwise interrupted and didn't exit gracefully.  See the "(emacs)
Saving Emacs Sessions" node in the Emacs manual for more details.

\f
* Startup Changes in Emacs 29.1

+++
** Emacs can now be used more easily in an executable script.
If you start an executable script with

    #!/usr/bin/emacs -x

Emacs will start without reading any init files (like with '--quick'),
and then execute the rest of the script file as Emacs Lisp.  When it
reaches the end of the script, Emacs will exit with an exit code from
the value of the final form.

+++
** Emacs now supports setting 'user-emacs-directory' via '--init-directory'.

+++
** Emacs now has a '--fingerprint' option.
This will output a string identifying the current Emacs build.

+++
** New hook 'after-pdump-load-hook'.
This is run at the end of the Emacs startup process, and it meant to
be used to reinitialize structures that would normally be done at load
time.

---
** New function 'startup-redirect-eln-cache'.
This function can be called in your init files to change the
user-specific directory where Emacs stores the "*.eln" files produced
by native compilation of Lisp packages Emacs loads.  The default
eln-cache directory is unchanged: it is the 'eln-cache' subdirectory
of 'user-emacs-directory'.

\f
* Incompatible changes in Emacs 29.1

---
** 'TAB' and '<backtab>' are now bound in 'button-map'.
This means that if you're standing on a button, 'TAB' will take you to
the next button, even if the mode has bound it to something else.
This also means that 'TAB' on a button in an 'outline-minor-mode'
heading will move point instead of collapsing the outline.

---
** 'Info-default-directory-list' is no longer populated at Emacs startup.
If you have code in your init file that removes directories from
'Info-default-directory-list', this will no longer work.

---
** 'C-k' no longer deletes files in 'ido-mode'.
To get the previous action back, put something like the following in
your init file:

    (require 'ido)
    (keymap-set ido-file-completion-map "C-k" #'ido-delete-file-at-head)

---
** New user option 'term-clear-full-screen-programs'.
By default, term will now work like most terminals when displaying
full-screen programs: When they exit, the output is cleared, leaving
what was displayed in the window before the programs started.  Set
this user option to nil to revert back to the old behavior.

---
** Support for old EIEIO functions is not autoloaded any more.
You need an explicit '(require 'eieio-compat)' to use 'defmethod'
and 'defgeneric' (which have been made obsolete in Emacs 25.1 with
'cl-defmethod' and 'cl-defgeneric').
Similarly you might need to '(require 'eieio-compat)' before loading
files that were compiled with an old EIEIO (Emacs<25).

---
** 'C-x 8 .' has been moved to 'C-x 8 . .'.
This is to open up the 'C-x 8 .' map to bind further characters there.

---
** 'source' and '.' in Eshell no longer accept the '--help' option.
This is for compatibility with the shell versions of these commands,
which don't handle options like '--help' in any special way.

---
** The 'delete-forward-char' command now deletes by grapheme clusters.
This command is by default bound to the <Delete> function key
(a.k.a. <deletechar>).  When invoked without a prefix argument or with
a positive prefix numeric argument, the command will now delete
complete grapheme clusters produced by character composition.  For
example, if point is before an Emoji sequence, pressing <Delete> will
delete the entire sequence, not just a single character at its
beginning.

+++
** 'load-history' does not treat autoloads specially any more.
An autoload definition appears just as a '(defun . NAME)' and the
'(t . NAME)' entries are not generated any more.

---
** The Tamil input methods no longer insert Tamil digits.
The input methods 'tamil-itrans' and 'tamil-inscript' no longer insert
the Tamil digits, as those digit characters are not used nowadays by
speakers of the Tamil language.  To get back the previous behavior,
use the new 'tamil-itrans-digits' and 'tamil-inscript-digits' input
methods instead.

+++
** current-time and related functions now yield (TICKS . HZ) timestamps.
Previously they yielded timestamps of the forms (HI LO US PS), (HI LO
US) or (HI LO), which were less regular and less efficient and which
lacked information about clock resolution.  This long-planned change
was documented in Emacs 27.  To convert a timestamp X to the old
4-element list form, you can use (time-convert X 'list).

\f
* Changes in Emacs 29.1

+++
** New command 'restart-emacs'.
This is like 'save-buffers-kill-emacs', but instead of just killing
the current Emacs process at the end, it starts a new Emacs process
(using the same command line arguments as the running Emacs process).
'kill-emacs' and 'save-buffers-kill-emacs' have also gained new
optional parameters to restart instead of just killing the current
process.

+++
** New user option 'mouse-drag-and-drop-region-cross-program'.
If non-nil, this option allows dragging text in the region from Emacs
to another program.

---
** New user option 'mouse-drag-and-drop-region-scroll-margin'.
If non-nil, this option allows scrolling a window while dragging text
around without a scroll wheel.

+++
** New user options 'dnd-indicate-insertion-point' and 'dnd-scroll-margin'.
These options allow adjusting point and scrolling a window when
dragging items from another program.

+++
** New function 'command-query'.
This function makes its argument command prompt the user for
confirmation before executing.

+++
** The 'disabled' property of a command's symbol can now be a list.
The first element of the list should be the symbol 'query', which will
cause the command disabled this way prompt the user with a y/n or a
yes/no question before executing.  The new function 'command-query' is
a convenient method of making commands disabled in this way.

---
** 'count-lines' will now report buffer totals if given a prefix.

---
** New user option 'find-library-include-other-files'.
If set to nil, commands like 'find-library' will only include library
files in the completion candidates.  The default is t, which preserves
previous behavior, whereby non-library files could also be included.

+++
** New command 'sqlite-mode-open-file' for examining an sqlite3 file.
This uses the new 'sqlite-mode' which allows listing the tables in a
DB file, and examining and modifying the columns and the contents of
those tables.

---
** 'write-file' will now copy some file mode bits.
If the current buffer is visiting a file that is executable, the
'C-x C-w' command will now make the new file executable, too.

+++
** New user option 'process-error-pause-time'.
This determines how long to pause Emacs after a process
filter/sentinel error has been handled.

+++
** New face 'variable-pitch-text'.
This face is like 'variable-pitch' (from which it inherits), but is
slightly larger, which should help with the visual size differences
between the default, non-proportional font and proportional fonts when
mixed.

+++
** New face 'mode-line-active'.
This inherits from the 'mode-line' face, but is the face actually used
on the mode lines (along with 'mode-line-inactive').

+++
** New function 'buffer-text-pixel-size'.
This is similar to 'window-text-pixel-size', but can be used when the
buffer isn't displayed.

+++
** New X resource: "borderThickness".
This controls the thickness of the external borders of the menu bars
and pop-up menus.

+++
** New X resource: "inputStyle".
This controls the style of the pre-edit and status areas of X input
methods.

+++
** On X11, Emacs now tries to synchronize window resize with the window manager.
This leads to less flicker and empty areas of a frame being displayed
when a frame is being resized.  Unfortunately, it does not work on
some ancient buggy window managers, so if Emacs appears to freeze, but
is still responsive to input, you can turn it off by setting the X
resource "synchronizeResize" to "off".

+++
** New frame parameter 'alpha-background' and X resource "alphaBackground".
This controls the opacity of the text background when running on a
composited display.

+++
** New frame parameter 'shaded'.
With window managers which support this, it controls whether or not a
frame's contents will be hidden, leaving only the title bar on display.

---
** New user option 'x-gtk-use-native-input'.
This controls whether or not GTK input methods are used by Emacs,
instead of XIM input methods.

+++
** New user option 'use-system-tooltips'.
This controls whether to use the toolkit tooltips, or Emacs's own
native implementation of tooltips as small frames.  This option is
only meaningful if Emacs was built with GTK+ or Haiku support, and
defaults to t, which makes Emacs use the toolkit tooltips.  The
existing GTK-specific option 'x-gtk-use-system-tooltips' is now an
alias of this new option.

** Connection-local variables

+++
*** Some connection-local variables are now user options.
The variables 'connection-local-profile-alist' and
'connection-local-criteria-alist' are now user options, in order to
make it more convenient to inspect and modify them.

+++
*** The default connection-local application can be changed temporarily.
Running 'with-connection-local-variables' defaults to application
'tramp'.  This can be changed by let-binding
'connection-local-default-application' to another symbol.  This is
useful when running code in a buffer, where Tramp has already set some
connection local variables.

---
** New minor mode 'pixel-scroll-precision-mode'.
When enabled, and if your mouse supports it, you can scroll the
display up or down at pixel resolution, according to what your mouse
wheel reports.  Unlike 'pixel-scroll-mode', this mode scrolls the
display pixel-by-pixel, as opposed to only animating line-by-line
scrolls.

** Terminal Emacs

---
*** Emacs will now use 24-bit colors on terminals that support "Tc" capability.
This is in addition to previously-supported ways of discovering 24-bit
color support: either via the "RGB" or "setf24" capabilities, or if
the 'COLORTERM' environment variable is set to the value "truecolor".

** ERT

+++
*** New ERT variables 'ert-batch-print-length' and 'ert-batch-print-level'.
These variables will override 'print-length' and 'print-level' when
printing Lisp values in ERT batch test results.

---
*** Redefining an ERT test in batch mode now signals an error.
Executing 'ert-deftest' with the same name as an existing test causes
the previous definition to be discarded, which was probably not
intended when this occurs in batch mode.  To remedy the error, rename
tests so that they all have unique names.

+++
*** ERT can generate JUnit test reports.
When environment variable 'EMACS_TEST_JUNIT_REPORT' is set, ERT
generates a JUnit test report under this file name.  This is useful
for Emacs integration into CI/CD test environments.

---
*** Unbound test symbols now signal an 'ert-test-unbound' error.
This affects the 'ert-select-tests' function and its callers.

** Emoji

+++
*** Emacs now has several new methods for inserting Emojis.
The Emoji commands are under the new 'C-x 8 e' prefix.

+++
*** New command 'emoji-insert' (bound to 'C-x 8 e e' and 'C-x 8 e i').
This command guides you through various Emoji categories and
combinations in a graphical menu system.

+++
*** New command 'emoji-search' (bound to 'C-x 8 e s').
This command lets you search for Emojis based on names.

+++
*** New command 'emoji-list' (bound to 'C-x 8 e l').
This command lists all Emojis (categorized by themes) in a special
buffer and lets you choose one of them.

---
*** New command 'emoji-recent' (bound to 'C-x 8 e r').
This command lets you choose among the Emojis you have recently
inserted.

+++
*** New command 'emoji-describe' (bound to 'C-x 8 e d').
This command will tell you the name of the Emoji at point.  (This
command also works for non-Emoji characters.)

---
*** New input method 'emoji'.

** Help

---
*** Commands like 'C-h f' have changed how they describe menu bindings.
For instance, previously a command might be described as having the
following bindings:

  It is bound to <open>, C-x C-f, <menu-bar> <file> <new-file>.

This has been changed to:

  It is bound to <open> and C-x C-f.
  It can also be invoked from the menu: File → Visit New File...

+++
*** The 'C-h .' command now accepts a prefix argument.
'C-u C-h .' would previously inhibit displaying a warning message if
there's no local help at point.  This has been changed to call
'button-describe'/'widget-describe' and display button/widget help
instead.

---
*** New user option 'help-enable-variable-value-editing'.
If enabled, 'e' on a value in *Help* will pop you to a new buffer
where you can edit the value.  This is not enabled by default, because
it's easy to make an edit that yields an invalid result.

---
*** 'C-h b' uses outlining by default.
Set 'describe-bindings-outline' to nil to get the old behavior.

---
*** Jumping to function/variable source now saves mark before moving point.
Jumping to source from "*Help*" buffer moves the point when the source
buffer is already open.  Now, the old point is pushed to mark ring.

+++
*** New key bindings in "*Help*" buffers: 'n' and 'p'.
These will take you (respectively) to the next and previous "page".

---
*** 'describe-char' now also outputs the name of emoji combinations.

+++
*** New key binding in "*Help*" buffer: 'I'.
This will take you to the Emacs Lisp manual entry for the item
displayed, if any.

---
*** The 'C-h m' ('describe-mode') "*Help*" buffer has been reformatted.
It now only includes local minor modes at the start, and the global
minor modes are listed after the major mode.

** Outline Mode

+++
*** Support for customizing the default visibility state of headings.
Customize the user option 'outline-default-state' to define what
headings will be visible after Outline mode is turned on.  When equal
to a number, the user option 'outline-default-rules' determines the
visibility of the subtree starting at the corresponding level.  Values
are provided to control showing a heading subtree depending on whether
the heading matches a regexp, or on whether its subtree has long lines
or is itself too long.

** Outline Minor Mode

+++
*** New user option 'outline-minor-mode-use-buttons'.
If non-nil, Outline Minor Mode will use buttons to hide/show outlines
in addition to the ellipsis.  Default nil.

---
*** New user option 'outline-minor-mode-buttons'.
This is a list of pairs of open/close strings used to display buttons.

+++
** Support for the WebP image format.
This support is built by default when the libwebp library is
available.  (This also includes support for animated WebP images.)  To
disable WebP support, use the '--without-webp' configure flag.  Image
specifiers can now use ':type webp'.

** Windows

+++
*** 'display-buffer' now can set up the body size of the chosen window.
For example, a 'display-buffer-alist' entry of

    '(window-width . (body-columns . 40))'

will make the body of the chosen window 40 columns wide.  For the
height use 'window-height' in combination with 'body-lines'.

---
*** You can customize which window 'scroll-other-window' operates on.
This is controlled by the new 'other-window-scroll-default' user option.

** Frames

+++
*** Deleted frames can now be undeleted.
The 16 most recently deleted frames can be undeleted with 'C-x 5 u' when
'undelete-frame-mode' is enabled.  Without a prefix argument, undelete
the most recently deleted frame.  With a numerical prefix argument
between 1 and 16, where 1 is the most recently deleted frame, undelete
the corresponding deleted frame.

** Tab Bars and Tab Lines

---
*** 'C-x t RET' creates a new tab when the provided tab name doesn't exist.

---
*** New keymap 'tab-bar-history-mode-map'.
By default, it contains 'C-c <left>' and 'C-c <right>' to browse
the history of tab window configurations back and forward.

---
** Better detection of text suspiciously reordered on display.
The function 'bidi-find-overridden-directionality' has been extended
to detect reordering effects produced by embeddings and isolates
(started by directional formatting control characters such as RLO and
LRI).  The new command 'highlight-confusing-reorderings' finds and
highlights segments of buffer text whose reordering for display is
suspicious and could be malicious.

** Emacs server and client changes

+++
*** New command-line option '-r' for emacsclient.
With this command-line option, Emacs reuses an existing graphical client
frame if one exists; otherwise it creates a new frame.

+++
*** 'server-stop-automatically' can be used to automatically stop the server.
The Emacs server will be automatically stopped when certain conditions
are met.  The conditions are given by the argument, which can be
'empty', 'delete-frame' or 'kill-terminal'.

** Rcirc

+++
*** New command 'rcirc-when'.

+++
*** New user option 'rcirc-cycle-completion-flag'.
Rcirc will use the default 'completion-at-point' mechanism.  The
conventional IRC behaviour of completing by cycling through the
available options can be restored by enabling this option.

+++
** 'imenu' is now bound to 'M-g i' globally.

* Editing Changes in Emacs 29.1

---
** Indentation of 'cl-flet' and 'cl-labels' has changed.
These forms now indent like this:

    (cl-flet ((bla (x)
                (* x x)))
      (bla 42))

This change also affects 'cl-macrolet', 'cl-flet*' and
'cl-symbol-macrolet'.

+++
** New user option 'translate-upper-case-key-bindings'.
This can be set to nil to inhibit translating upper case keys to lower
case keys.

+++
** New command 'ensure-empty-lines'.
This command increases (or decreases) the number of empty lines before
point.

---
** Improved mouse behavior with auto-scrolling modes.
When clicking inside the 'scroll-margin' or 'hscroll-margin' region
the point is now moved only when releasing the mouse button.  This no
longer results in a bogus selection, unless the mouse has been
effectively dragged.

+++
** 'kill-ring-max' now defaults to 120.

---
** New user option 'yank-menu-max-items'.
Customize this option to limit the number of entries in the menu
"Edit->Paste from Kill Menu".  The default is 60.

+++
** Performing a pinch gesture on a touchpad now increases the text scale.

** show-paren-mode

+++
*** New user option 'show-paren-context-when-offscreen'.
When non-nil, if the point is in a closing delimiter and the opening
delimiter is offscreen, shows some context around the opening
delimiter in the echo area.  Default nil.

May also be set to the symbols 'overlay' or 'child-frame' in which
case the context is shown in an overlay or child-frame at the top-left
of the current window.  The latter option requires a graphical frame.
On non-graphical frames, the context is shown in the echo area.

** Comint

+++
*** 'comint-term-environment' is now aware of connection-local variables.
The user option 'comint-terminfo-terminal' and variable
'system-uses-terminfo' can now be set as connection-local variables to
change the terminal used on a remote host.

** Mwheel

---
*** New user options for alternate wheel events.
The options 'mouse-wheel-down-alternate-event',
'mouse-wheel-up-alternate-event', 'mouse-wheel-left-alternate-event',
and 'mouse-wheel-right-alternate-event' have been added to better
support systems where two kinds of wheel events can be received.

** Editing complex text layout (CTL) scripts

*** The <Delete> function key now allows deleting the entire composed sequence.
For the details, see the item about the 'delete-forward-char' command
above.

*** New user option 'composition-break-at-point'.
Setting it to a non-nil value temporarily disables automatic
composition of character sequences at point, and thus makes it easier
to edit such sequences by allowing point to "enter" the sequence.

*** New language environment "Northern Thai".
This uses the Tai Tham script, whose support has been enhanced.

*** New language environment "Brahmi".
This language environment supports Brahmi, which is a historical
script that was used in ancient South Asia.  A new input method,
'brahmi', is provided to type text in this script.

\f
* Changes in Specialized Modes and Packages in Emacs 29.1

** Flymake

+++
*** New user option 'flymake-mode-line-lighter'.

+++
** New minor mode 'word-wrap-whitespace-mode' for extending 'word-wrap'.
This mode switches 'word-wrap' on, and breaks on all the whitespace
characters instead of just SPC and TAB.

---
** New mode, 'emacs-news-mode', for editing the NEWS file.
This mode adds some highlighting, fixes the 'M-q' command, and has
commands for doing maintenance.

---
** kmacro
Kmacros are now OClosures and have a new constructor 'kmacro' which
uses the 'key-parse' syntax.  It replaces the old 'kmacro-lambda-form'
(which is now declared obsolete).

---
** 'savehist.el' can now truncate variables that are too long.
An element of 'savehist-additional-variables' can now be of the form
'(VARIABLE . MAX-ELTS)', which means to truncate the VARIABLE's value to
at most MAX-ELTS elements (if the value is a list) before saving the
value.

** Minibuffer and Completions

+++
*** New commands for navigating completions from the minibuffer.
When the minibuffer is the current buffer, typing 'M-<up>' or
'M-<down>' selects a previous/next completion candidate from the
"*Completions*" buffer and inserts it to the minibuffer.
When the user option 'minibuffer-completion-auto-choose' is nil,
'M-<up>' and 'M-<down>' do the same, but without inserting
a completion candidate to the minibuffer, then 'M-RET' can be used
to choose the currently active candidate from the "*Completions*"
buffer and exit the minibuffer.  With a prefix argument, 'C-u M-RET'
inserts the currently active candidate to the minibuffer, but doesn't
exit the minibuffer.

+++
*** The "*Completions*" buffer can now be automatically selected.
To enable this behavior, customize the user option
'completion-auto-select' to t, then pressing 'TAB' will switch to the
"*Completions*" buffer when it pops up that buffer.  If the value is
'second-tab', then the first 'TAB' will display "*Completions*", and
the second one will switch to the "*Completions*" buffer.

---
*** New user option 'completion-wrap-movement'.
When non-nil, the commands 'next-completion' and 'previous-completion'
automatically wrap around on reaching the beginning or the end of
the "*Completions*" buffer.

+++
*** New user option 'completions-sort'.
This option controls the sorting of the completion candidates in
the "*Completions*" buffer.  Available styles are no sorting,
alphabetical (the default), or a custom sort function.

+++
*** New values for the 'completion-auto-help' user option.
There are two new values to control the way the "*Completions*" buffer
behaves after pressing a 'TAB' if completion is not unique.  The value
'always' updates or shows the "*Completions*" buffer after any attempt
to complete.  The value 'visual' is like 'always', but only updates
the completions if they are already visible.  The default value 't'
always hides the completion buffer after some completion is made.

+++
*** New user option 'completions-max-height'.
This option limits the height of the "*Completions*" buffer.

+++
*** New user option 'completions-header-format'.
This is a string to control the heading line to show in the
"*Completions*" buffer before the list of completions.
If it contains "%s", that is replaced with the number of completions.
If nil, the heading line is not shown.

+++
*** New user option 'completions-highlight-face'.
When this user option names a face, the current
candidate in the "*Completions*" buffer is highlighted with that face.
The nil value disables this highlighting.

---
*** Choosing a completion with a prefix argument doesn't exit the minibuffer.
This means that typing 'C-u RET' on a completion candidate in the
"*Completions*" buffer inserts the completion to the minibuffer,
but doesn't exit the minibuffer.

** Isearch and Replace

+++
*** Changes in how isearch responds to 'mouse-yank-at-point'.
If a user does 'C-s' and then uses '<mouse-2>' ('mouse-yank-primary')
outside the echo area, Emacs will, by default, end the isearch and
yank the text where the mouse cursor is.  In Emacs 29, if
'mouse-yank-at-point' is non-nil, the text will be added to the
isearch instead.

+++
*** New user option 'char-fold-override'.
Non-nil means that the default definitions of equivalent characters
are overridden.

+++
*** New command 'isearch-emoji-by-name'.
It is bound to 'C-x 8 e RET' during an incremental search.  The
command accepts the Unicode name of an Emoji (for example, "smiling
face" or "heart with arrow"), like 'C-x 8 e e', with minibuffer
completion, and adds the Emoji into the search string.

+++
** New minor mode 'glyphless-display-mode'.
This allows an easy way to toggle seeing all glyphless characters in
the current buffer.

** Registers

+++
*** Buffer names can now be stored in registers.
For instance, to enable jumping to the "*Messages*" buffer with
'C-x r j m':

    (set-register ?m '(buffer . "*Messages*"))

** pixel-fill

+++
*** This is a new package that deals with filling variable-pitch text.

+++
*** New function 'pixel-fill-region'.
This fills the region to be no wider than a specified pixel width.

** Info

+++
*** 'M-x info-apropos' now takes a prefix argument to search for regexps.

---
*** New command 'Info-goto-node-web' and key binding 'G'.
This will take you to the gnu.org web server's version of the current
info node.  This command only works for the Emacs and Emacs Lisp manuals.

** vc

---
*** 'C-x v v' on an unregistered file will now use the most specific backend.
Previously, if you had an SVN-covered "~/" directory, and a Git-covered
directory in "~/foo/bar", using 'C-x v v' on a new, unregistered file
"~/foo/bar/zot" would register it in the SVN repository in "~/" instead of
in the Git repository in "~/foo/bar".  This makes this command
consistent with 'vc-responsible-backend'.

** Message

---
*** New user option 'mml-attach-file-at-the-end'.
If non-nil, 'C-c C-a' will put attached files at the end of the message.

---
*** Message Mode now supports image yanking.

+++
*** New user option 'message-server-alist'.
This controls automatic insertion of the "X-Message-SMTP-Method"
header before sending a message.

** HTML Mode

---
*** HTML Mode now supports "text/html" and "image/*" yanking.

** Texinfo Mode

---
*** 'texinfo-mode' now has a specialised 'narrow-to-defun' definition.
It narrows to the current node.

** EUDC

+++
*** 'eudc-expansion-overwrites-query' to 'eudc-expansion-save-query-as-kill'.
'eudc-expansion-overwrites-query' is renamed to
'eudc-expansion-save-query-as-kill' to reflect the actual behavior of
the user option.

+++
*** New command 'eudc-expand-try-all'.
This command can be used in place of 'eudc-expand-inline'.  It takes a
prefix argument that causes 'eudc-expand-try-all' to return matches
from all servers instead of just the matches from the first server to
return any.  This is useful for example, if one wants to search LDAP
for a name that happens to match a contact in one's BBDB.

+++
*** New behavior and default for user option 'eudc-inline-expansion-format'.
EUDC inline expansion result formatting defaulted to

    '("%s %s <%s>" firstname name email)

Since email address specifications need to comply with RFC 5322 in
order to be useful in messages, there was a risk to produce syntax
which was standard with RFC 822, but is marked as obsolete syntax by
its successor RFC 5322.  Also, the first and last name part was never
enclosed in double quotes, potentially producing invalid address
specifications, which may be rejected by a receiving MTA.  Thus, this
variable can now additionally be set to nil (the new default), or a
function.  In both cases, the formatted result will be in compliance
with RFC 5322.  When set to nil, a default format very similar to the
old default will be produced.  When set to a function, that function
is called, and the returned values are used to populate the phrase and
comment parts (see RFC 5322 for definitions).  In both cases, the
phrase part will be automatically quoted if necessary.

** eww/shr

+++
*** New user option to automatically rename EWW buffers.
The 'eww-auto-rename-buffer' user option can be configured to rename
rendered web pages by using their title, URL, or a user-defined
function which returns a string.  For the first two cases, the length
of the resulting name is controlled by 'eww-buffer-name-length'.  By
default, no automatic renaming is performed.

+++
*** New user option 'shr-allowed-images'.
This complements 'shr-blocked-images', but allows specifying just the
allowed images.

+++
*** New user option 'shr-use-xwidgets-for-media'.
If non-nil (and Emacs has been built with support for xwidgets),
display <video> elements with an xwidget.  Note that this is
experimental, and is known to crash Emacs on some systems, and just
doesn't work on other systems.  Also see etc/PROBLEMS.

+++
*** New user option 'eww-url-transformers'.
These are used to alter an URL before using it.  By default it removes
the common "utm_" trackers from URLs.

** Gnus

---
*** Gnus now uses a variable-pitch font in the headers by default.
To get the monospace font back, you can put something like the
following in your .gnus file:

    (set-face-attribute 'gnus-header nil :inherit 'unspecified)

---
*** The default value of 'gnus-treat-fold-headers' is now 'head'.

---
*** New face 'gnus-header'.
All other 'gnus-header-*' faces inherit from this face now.

+++
*** New user option 'gnus-treat-emojize-symbols'.
If non-nil, symbols that have an emoji representation will be
displayed as emojis.  Default nil.

+++
*** New command 'gnus-article-emojize-symbols'.
This is bound to 'W D e' and will display symbols that have emoji
representation as emojis.

+++
*** New mu backend for gnus-search.
Configuration is very similar to the notmuch and namazu backends.  It
supports the unified search syntax.

---
*** gnus-html-image-cache-ttl is now a seconds count.
Formerly it was a pair of numbers (A B) that represented 65536*A + B,
to cater to older Emacs implementations that lacked bignums.
The older form still works but is undocumented.

** EIEIO

+++
*** 'slot-value' can now be used to access slots of 'cl-defstruct' objects.

** align

---
*** Alignment in 'text-mode' has changed.
Previously, 'M-x align' didn't do anything, and you had to say 'C-u
M-x align' for it to work.  This has now been changed.  The default
regexp for 'C-u M-x align-regexp' has also been changed to be easier
for inexperienced users to use.

** Help

---
*** New mode, 'emacs-news-view-mode', for viewing the NEWS file.
This mode is used by the 'C-h N' command, and adds buttons to manual
entries and symbol references.

---
*** New user option 'help-link-key-to-documentation'.
When this option is non-nil (which is the default), key bindings
displayed in the "*Help*" buffer will be linked to the documentation
for the command they are bound to.  This does not affect listings of
key bindings and functions (such as 'C-h b').

** info-look

---
*** info-look specs can now be expanded at run time instead of a load time.
The new ':doc-spec-function' element can be used to compute the
':doc-spec' element when the user asks for info on that particular
mode (instead of at load time).

** subr-x

+++
*** New macro 'with-memoization' provides a very primitive form of memoization.

** ansi-color

---
*** Support for ANSI 256-color and 24-bit colors.
256-color and 24-bit color codes are now handled by ANSI color
filters and displayed with the specified color.

** term-mode

---
*** Support for ANSI 256-color and 24-bit colors, italic and other fonts.
Term-mode can now display 256-color and 24-bit color codes.  It can
also handle ANSI codes for faint, italic and blinking text, displaying
it with new 'term-{faint,italic,slow-blink,fast-blink}' faces.

** Xref

+++
*** 'project-find-file' and 'project-or-external-find-file' now accept
a prefix argument which is interpreted to mean "include all files".

+++
*** 'project-kill-buffers' can display the list of buffers to kill.
Customize the user option 'project-kill-buffers-display-buffer-list'
to enable the display of the buffer list.

+++
*** New command 'xref-go-forward'.
It is bound to 'C-M-,' and jumps to the location where 'xref-go-back'
('M-,', also known as 'xref-pop-marker-stack') was invoked previously.

+++
*** 'xref-query-replace-in-results' prompting change.
This command no longer prompts for FROM when called without prefix
argument.  This makes the most common case faster: replacing entire
matches.

+++
*** New command 'xref-find-references-and-replace' to rename one identifier.

---
*** New variable 'xref-current-item' (renamed from a private version).

---
*** New function 'xref-show-xrefs'.

** File notifications

+++
*** The new command 'file-notify-rm-all-watches' removes all file notifications.

** Sql

---
*** Sql now supports sending of passwords in-process.
To improve security, if an sql product has ':password-in-comint' set
to t, a password supplied via the minibuffer will be sent in-process,
as opposed to via the command-line.

** Image Mode

+++
*** New command 'image-transform-fit-to-window'.
This command fits the image to the current window by scaling down or
up as necessary.  Unlike 'image-transform-fit-both', this does not
only scale the image down, but up as well.  It is bound to "s w" in
Image Mode by default.

+++
*** 'image-transform-fit-to-(height|width)' are now obsolete.
Use the new command 'image-transform-fit-to-window' instead.
The keybinding for 'image-transform-fit-to-width' is now 's i'.

---
*** User option 'image-auto-resize' can now be set to 'fit-window'.
This works like 'image-transform-fit-to-window'.

---
*** New user option 'image-auto-resize-max-scale-percent'.
The new 'fit-window' option will never scale an image more than this
much (in percent).  It is nil by default, which means no limit.

---
*** New user option 'image-text-based-formats'.
This controls whether or not to show a message when opening certain
image formats saying how to edit it as text.  The default is to show
this message for SVG and XPM.

** Image-Dired

+++
*** 'image-dired-display-image-mode' is now based on 'image-mode'.
This avoids converting images in the background, and makes Image-Dired
noticeably faster.  New keybindings from 'image-mode' are now
available in the "*image-dired-display-image*" buffer; press '?' or
'h' in that buffer to see the full list.  Finally, some commands and
user options that are no longer needed are now obsolete:
'image-dired-cmd-create-temp-image-options',
'image-dired-cmd-create-temp-image-program',
'image-dired-display-current-image-full',
'image-dired-display-current-image-sized',
'image-dired-display-window-height-correction',
'image-dired-display-window-width-correction',
'image-dired-temp-image-file'.

---
*** Navigation and marking commands now work in image display buffer.
The following new bindings have been added:

  n / SPC   image-dired-display-next-thumbnail-original
  p / DEL   image-dired-display-previous-thumbnail-original
  m         image-dired-mark-thumb-original-file
  d         image-dired-flag-thumb-original-file
  u         image-dired-unmark-thumb-original-file

---
*** Reduce dependency on external "exiftool" command.
The 'image-dired-copy-with-exif-file-name' no longer requires an
external "exiftool" command to be available.  The user options
'image-dired-cmd-read-exif-data-program' and
'image-dired-cmd-read-exif-data-options' are now obsolete.

---
*** New command for the thumbnail buffer.
The new command 'image-dired-unmark-all-marks' has been added.  It is
bound to 'U' in the thumbnail and display buffer.

---
*** Support Thumbnail Managing Standard v0.9.0 (Dec 2020).
This standard allows sharing generated thumbnails across different
programs.  Version 0.9.0 adds two larger thumbnail sizes: 512x512 and
1024x1024 pixels.  See the user option 'image-dired-thumbnail-storage'
to use it; it is not enabled by default.

---
*** Support GraphicsMagick command line tools.
Support for the GraphicsMagick command line tool ("gm") has been
added, and is used instead of ImageMagick when it is available.

---
*** New face 'image-dired-thumb-flagged'.
If 'image-dired-thumb-mark' is non-nil (the default), this face is
used for images that are flagged for deletion in the Dired buffer
associated with Image-Dired.

---
*** 'image-dired-slideshow-start' is now bound to 'S'.
It is bound in both the thumbnail and display buffer.

---
*** The 'image-dired-slideshow-start' command no longer prompts.
It no longer inconveniently prompts for a number of images and a
delay: it runs indefinitely, but stops automatically on any command.
You can set the delay with a prefix argument, or a negative prefix
argument to prompt for a delay.  Customize the user option
'image-dired-slideshow-delay' to change the default from 5 seconds.

---
*** Support for bookmark.el.
The command 'bookmark-set' (bound to 'C-x r m') is now supported in
the thumbnail view, and will create a bookmark that opens the current
directory in Image-Dired.

---
*** New user option 'image-dired-marking-shows-next'.
If this option is non-nil (the default), marking, unmarking or
flagging an image in either the thumbnail or display buffer shows the
next image.

---
*** Image information is now shown in the header line.
This replaces the message most navigation commands in the thumbnail
buffer used to show at the bottom of the screen.

+++
*** 'image-dired-show-all-from-dir-max-files' has been increased to 500.
This option controls asking for confirmation when starting Image-Dired
in a directory with many files.  However, Image-Dired creates
thumbnails in the background these days, so this is not as important
as it used to be, back when entering a large directory could lock up
Emacs for tens of seconds.  In addition, you can now customize this
option to nil to disable this confirmation completely.

---
*** Make 'image-dired-rotate-thumbnail-(left|right)' obsolete.
Instead, use commands 'image-dired-refresh-thumb' to generate a new
thumbnail, or 'image-rotate' to rotate the thumbnail without updating
the thumbnail file.

** Dired

+++
*** New user option 'dired-mouse-drag-files'.
If non-nil, dragging file names with the mouse in a Dired buffer will
initiate a drag-and-drop session allowing them to be opened in other
programs.

+++
*** New user option 'dired-free-space'.
Dired will now, by default, include the free space in the first line
instead of having it on a separate line.  To get the previous behavior
back, say:

    (setq dired-free-space 'separate)

---
*** New user option 'dired-make-directory-clickable'.
If non-nil (which is the default), hitting 'RET' or 'mouse-1' on
the directory components at the directory displayed at the start of
the buffer will take you to that directory.

** Exif

---
*** New function 'exif-field'.
This is a convenience function to extract the field data from
'exif-parse-file' and 'exif-parse-buffer'.

** Xwidgets

---
*** New user option 'xwidget-webkit-buffer-name-format'.
Using this option you can control how the xwidget-webkit buffers are
named.

---
*** New user option 'xwidget-webkit-cookie-file'.
Using this option you can control whether the xwidget-webkit buffers
save cookies set by web pages, and if so, in which file to save them.

+++
*** New minor mode 'xwidget-webkit-edit-mode'.
When this mode is enabled, self-inserting characters and other common
web browser shortcut keys are redefined to send themselves to the
WebKit widget.

+++
*** New minor mode 'xwidget-webkit-isearch-mode'.
This mode acts similarly to incremental search, and allows searching
the contents of a WebKit widget.  In xwidget-webkit mode, it is bound
to 'C-s' and 'C-r'.

+++
*** New command 'xwidget-webkit-browse-history'.
This command displays a buffer containing the page load history of
the current WebKit widget, and allows you to navigate it.

---
*** On X11, the WebKit inspector is now available inside xwidgets.
To access the inspector, right click on the widget and select "Inspect
Element".

---
*** "Open in New Window" in a WebKit widget's context menu now works.
The newly created buffer will be displayed via 'display-buffer', which
can be customized through the usual mechanism of 'display-buffer-alist'
and friends.

** Tramp

---
*** Tramp supports abbreviating remote home directories now.
When calling 'abbreviate-file-name' on a Tramp file name, the result
will abbreviate the user's home directory, for example by abbreviating
"/ssh:user@host:/home/user" to "/ssh:user@host:~".

+++
*** New user option 'tramp-use-scp-direct-remote-copying'.
When set to non-nil, Tramp does not copy files between two remote
hosts via a local copy in its temporary directory, but let the 'scp'
command do this job.

+++
*** Proper password prompts for methods "doas", "sudo" and "sudoedit".
The password prompts for these methods reflect now the credentials of
the user requesting such a connection, and not of the user who is the
target.  This has always been needed, just the password prompt and the
related 'auth-sources' entry were wrong.

** Browse URL

---
*** Support for the Netscape web browser has been removed.
This support has been obsolete since Emacs 25.1.  The final version of
the Netscape web browser was released in February, 2008.

---
*** Support for the Galeon web browser has been removed.
This support has been obsolete since Emacs 25.1.  The final version of
the Galeon web browser was released in September, 2008.

** Ruby Mode

---
*** New user option 'ruby-toggle-block-space-before-parameters'.

** Eshell

+++
*** New feature to easily bypass Eshell's own pipelining.
Prefixing '|', '<' or '>' with an asterisk, i.e. '*|', '*<' or '*>',
will cause the whole command to be passed to the operating system
shell.  This is particularly useful to bypass Eshell's own pipelining
support for pipelines which will move a lot of data.  See section
"Running Shell Pipelines Natively" in the Eshell manual, node
"(eshell) Input/Output".

+++
*** New module to help supplying absolute file names to remote commands.
After enabling the new 'eshell-elecslash' module, typing a forward
slash as the first character of a command line argument will
automatically insert the Tramp prefix.  The automatic insertion
applies only when 'default-directory' is remote and the command is a
Lisp function.  This frees you from having to keep track of whether
commands are Lisp function or external when supplying absolute file
name arguments.  See "Electric forward slash" in the Eshell manual.

** Miscellaneous

+++
*** New user option 'font-lock-ignore'.
This option provides a mechanism to selectively disable font-lock
keyword-driven fontifications.

+++
*** New package vtable.el for formatting tabular data.
This package allows formatting data using variable-pitch fonts.
The resulting tables can display text in variable pitch fonts, text
using fonts of different sizes, and images.  See the "(vtable) Top"
manual for more details.

---
*** 'list-bookmarks' now includes a type column.
Types are registered via a 'bookmark-handler-type' symbol property on
the jumping function.

---
*** New minor mode 'elide-head-mode'.
Enabling this minor mode turns on hiding header material, like
'elide-head' does; disabling it shows the header.  The commands
'elide-head' and 'elide-head-show' are now obsolete.

---
** The autoarg.el library is now marked obsolete.
This library provides the 'autoarg-mode' and 'autoarg-kp-mode' minor
modes to emulate the behavior of the historical editor Twenex Emacs.
It is believed to no longer be useful.

---
** proced.el shows system processes of remote hosts.
When 'default-directory' is remote, and 'proced' is invoked with a
negative argument like 'C-u - proced', the system processes of that
remote host are shown.  Alternatively, the user option
'proced-show-remote-processes' can be set to non-nil.
'proced-signal-function' has been marked obsolete.

\f
* New Modes and Packages in Emacs 29.1

+++
** New package 'oclosure'.
Allows the creation of "functions with slots" or "function objects"
via the macros 'oclosure-define' and 'oclosure-lambda'.

*** New generic function 'oclosure-interactive-form'.
Used by 'interactive-form' when called on an OClosure.
This allows specific OClosure types to compute their interactive specs
on demand rather than precompute them when created.

---
** New theme 'leuven-dark'.
This is a dark version of the 'leuven' theme.

+++
** New mode 'erts-mode'.
This mode is used to edit files geared towards testing actions in
Emacs buffers, like indentation and the like.  The new ert function
'ert-test-erts-file' is used to parse these files.

\f
* Incompatible Lisp Changes in Emacs 29.1

---
** 'prin1' doesn't always escape "." and "?" in symbols any more.
Previously, symbols like 'foo.bar' would be printed by 'prin1' as
"foo\.bar".  This now prints as "foo.bar" instead.  The Emacs Lisp
reader interprets these strings as referring to the same symbol, so
this is virtually always backwards-compatible, but there may
theoretically be code out there that expects a specific printed
representation.

The same is the case with the "?" character: The 'foo?' symbol is now
printed as "foo?" instead of "foo\?".

If the "." and "?" characters are the first character in the symbol,
they will still be escaped, so the '.foo' symbol is still printed as
"\.foo" and the '?bar' symbol is still printed as "\?bar".

+++
** Remapping 'mode-line' no longer works as expected.
'mode-line' is now the parent face of the new 'mode-line-active' face,
and remapping parent of basic faces does not work reliably.
Instead of remapping 'mode-line', you have to remap 'mode-line-active'.

---
** User option 'mail-source-ignore-errors' is now obsolete.
The whole mechanism for prompting users to continue in case of
mail-source errors has been removed, so this option is no longer
needed.

** Fonts

---
*** Emacs now supports 'medium' fonts.
Emacs previously didn't distinguish between the 'regular'/'normal'
weight and the 'medium' weight, but it now also supports the (heavier)
'medium' weight.  However, this means that if you previously specified
a weight of 'normal' and the font doesn't have this weight, Emacs
won't find the font spec.  In these cases, replacing ":weight 'normal"
with ":weight 'medium" should fix the issue.

---
** Keymap descriptions have changed.
'help--describe-command', 'C-h b' and associated functions that output
keymap descriptions have changed.  In particular, prefix commands are
not output at all, and instead of "??" for closures/functions,
"[closure]"/"[lambda]" is output.

---
** 'downcase' details have changed slightly.
In certain locales, changing the case of an ASCII-range character may
turn it into a multibyte character, most notably with "I" in Turkish
(the lowercase is "ı", 0x0131).  Previously, 'downcase' on a unibyte
string was buggy, and would mistakenly just return the lower byte of
this, 0x31 (the digit "1").  'downcase' on a unibyte string has now
been changed to downcase such characters as if they were ASCII.  To
get proper locale-dependent downcasing, the string has to be converted
to multibyte first.  (This goes for the other case-changing functions,
too.)

---
** Functions in 'tramp-foreign-file-name-handler-alist' have changed.
Functions to determine which Tramp file name handler to use are now
passed a file name in dissected form (via 'tramp-dissect-file-name')
instead of in string form.

---
** 'def' indentation changes.
In 'emacs-lisp-mode', forms with a symbol with a name that start with
"def" have been automatically indented as if they were 'defun'-like
forms, for instance:

    (defzot 1
      2 3)

This heuristic has now been removed, and all functions/macros that
want to be indented this way have to be marked with

    (declare (indent defun))

or the like.  If the function/macro definition itself can't be
changed, the indentation can also be adjusted by saying something
like:

    (put 'defzot 'lisp-indent-function 'defun)

---
** The 'inhibit-changing-match-data' variable is now obsolete.
Instead, functions like 'string-match' and 'looking-at' now take an
optional INHIBIT-MODIFY argument.

---
** 'gnus-define-keys' is now obsolete.
Use 'define-keymap' instead.

---
** MozRepl has been removed from js.el.
MozRepl was removed from Firefox in 2017, so this code doesn't work
with recent versions of Firefox.

---
** The function 'image-dired-get-exif-data' is now obsolete.
Use 'exif-parse-file' and 'exif-field' instead.

---
** 'insert-directory' alternatives should not change the free disk space line.
This change is now applied in 'dired-insert-directory'.

---
** Some functions and variables obsolete since Emacs 23 have been removed:
'find-emacs-lisp-shadows', 'newsticker-cache-filename',
'unify-8859-on-decoding-mode', 'unify-8859-on-encoding-mode',
'vc-arch-command'.

+++
** New generic function 'function-doumentation'.
Can dynamically generate a raw docstring depending on the type of
a function.
Used mainly for docstrings of OClosures.

+++
** Base64 encoding no longer tolerates latin-1 input.
The functions 'base64-encode-string', 'base64url-encode-string',
'base64-encode-region' and 'base64url-encode-region' no longer accept
characters in the range U+0080..U+00FF as substitutes for single bytes
in the range 128..255, but signal an error for all multibyte characters.
The input must be encoded text.

+++
** The 'clone-indirect-buffer-hook' is now run by 'make-indirect-buffer'.
It was previously only run by 'clone-indirect-buffer' and
'clone-indirect-buffer-other-window'.  Since 'make-indirect-buffer' is
called by both of these, the hook is now run by all 3 of these
functions.

\f
* Lisp Changes in Emacs 29.1

---
** New function 'string-edit'.
This is meant to be used when the user has to edit a (potentially)
long string.  It pops you to a new buffer where you can edit the
string, and a callback is called when the user types 'C-c C-c'.

+++
** New function 'read-string-from-buffer'.
This is a modal version of 'string-edit', and can be used as an
alternative to 'read-string'.

+++
** The return value of 'clear-message-function' is not ignored anymore.
If the function returns 'dont-clear-message', then the message is not
cleared, with the assumption that the function cleared it itself.

+++
** The local variable section now supports defining fallback modes.
This was previously only available when using a property line (i.e.,
putting the modes on the first line of a file).

+++
** New function 'flush-standard-output'.
This enables you do display incomplete lines from batch-based Emacs
scripts.

+++
** New convenience function 'buttonize-region'.
This works like 'buttonize', but for a region instead of a string.

+++
** 'macroexp-let2*' can omit TEST arg and use single-var bindings.

+++
** New macro-writing macros, 'cl-with-gensyms' and 'cl-once-only'.
See the "(cl) Macro-Writing Macros" manual section for descriptions.

+++
** New variable 'last-event-device' and new function 'device-class'.
On X Windows, 'last-event-device' specifies the input extension device
from which the last input event originated, and 'device-class' can be
used to determine the type of an input device.

+++
** 'track-mouse' can be a new value 'drag-source'.
This means the same as 'dropping', but modifies the mouse position
list in reported motion events if there is no frame underneath the
mouse pointer.

+++
** New function 'x-begin-drag'.
This function initiates a drag-and-drop request with the contents of
the selection 'XdndSelection', and returns when a drop occurs.

---
** New function 'ietf-drums-parse-date-string'.
This function parses RFC5322 (and RFC822) date strings, and should be
used instead of 'parse-time-string' when parsing data that's standards
compliant.

+++
** New macro 'setopt'.
This is like 'setq', but is meant to be used for user options instead
of plain variables, and
uses 'custom-set'/'set-default' to set them.

+++
** New utility predicate 'mode-line-window-selected-p'.
This is meant to be used from ':eval' mode line constructs to create
different mode line looks for selected and unselected windows.

+++
** New variable 'messages-buffer-name'.
This variable (defaulting to "*Messages*") allows packages to override
where messages are logged.

+++
** New function 'readablep'.
This function says whether an object can be written out and then
read back by the Emacs Lisp reader.

+++
** New variable 'print-unreadable-function'.
This variable allows changing how Emacs prints unreadable objects.

---
** The user option 'polling-period' now accepts floating point values.
This means Emacs can now poll for input during Lisp execution more
frequently than once in a second.

---
** New function 'bidi-string-strip-control-characters'.
This utility function is meant for displaying strings when it's
essential that there's no bidirectional context.

---
** The Gnus range functions have been moved to a new library, range.el.
All the old names have been made obsolete.

+++
** New function 'function-alias-p'.
This predicate says whether an object is a function alias, and if it
is, the alias chain is returned.

+++
** New variable 'lisp-directory' holds the directory of Emacs's own Lisp files.

+++
** New facility for handling session state: 'multisession-value'.
This can be used as a convenient way to store (simple) application
state, and the command 'list-multisession-values' allows users to list
(and edit) this data.

+++
** New function 'get-display-property'.
This is like 'get-text-property', but works on the 'display' text
property.

+++
** New function 'add-text-display-property'.
This is like 'put-text-property', but works on the 'display' text
property.

+++
** New 'min-width' 'display' property.
This allows setting a minimum display width for a region of text.

+++
** New 'cursor-face' text property.
This uses 'cursor-face' instead of the default face when cursor is on or
near the character and 'cursor-face-highlight-mode' is enabled.  The
user option 'cursor-face-highlight-nonselected-window' is similar to
'highlight-nonselected-windows', but for this property.

+++
** New event type 'touch-end'.
This event is sent whenever the user's finger moves off the mouse
wheel on some mice, or when the user's finger moves off the touchpad.

+++
** New event type 'pinch'.
This event is sent when a user performs a pinch gesture on a touchpad,
which is comprised of placing two fingers on the touchpad and moving
them towards or away from each other.

+++
** New hook 'x-pre-popup-menu-hook'.
This hook is run before 'x-popup-menu' is about to display a
deck-of-cards menu on screen.

** New function 'buffer-match-p'.
Check if a buffer satisfies some condition.  Some examples for
conditions can be regular expressions that match a buffer name, a
cons-cell like '(major-mode . shell-mode)' that matches any buffer
where 'major-mode' is 'shell-mode' or a combined with a condition like
'(and "\\`\\*.+\\*\\'" (major-mode . special-mode))'.

** New function 'match-buffers'.
Use 'buffer-match-p' to gather a list of buffers that match a
condition.

** Text security and suspiciousness

+++
*** New library textsec.el.
This library contains a number of checks for whether a string is
"suspicious".  This usually means that the string contains characters
that have glyphs that can be confused with other, more commonly used
glyphs, or contain bidirectional (or other) formatting characters that
may be used to confuse a user.

+++
*** New user option 'textsec-check'.
If non-nil (which is the default), Emacs packages that are vulnerable
to attackers trying to confuse the users will use the textsec library
to mark suspicious text.  For instance shr/eww will mark suspicious
URLs and links, Gnus will mark suspicious From addresses, and
Message mode will query the user if the user is sending mail to a
suspicious address.  If this variable is nil, these checks aren't
performed.

+++
*** New function 'textsec-suspicious-p'.
This is the main function Emacs applications should be using to check
whether a string is suspicious.  It heeds the 'textsec-check' user
option.

** Keymaps and key definitions

+++
*** New functions for defining and manipulating keystrokes.
These all take the syntax defined by 'key-valid-p'.  None of the older
functions have been deprecated or altered, but they are now
de-emphasized in the documentation.

+++
*** Use 'keymap-set' instead of 'define-key'.

+++
*** Use 'keymap-global-set' instead of 'global-set-key'.

+++
*** Use 'keymap-local-set' instead of 'local-set-key'.

+++
*** Use 'keymap-global-unset' instead of 'global-unset-key'.

+++
*** Use 'keymap-local-unset' instead of 'local-unset-key'.

+++
*** Use 'keymap-substitute' instead of 'substitute-key-definition'.

+++
*** Use 'keymap-set-after' instead of 'define-key-after'.

+++
*** Use 'keymap-lookup' instead of 'lookup-keymap' and 'key-binding'.

+++
*** Use 'keymap-local-lookup' instead of 'local-key-binding'.

+++
*** Use 'keymap-global-lookup' instead of 'global-key-binding'.

+++
*** 'define-key' now takes an optional REMOVE argument.
If non-nil, remove the definition from the keymap.  This is subtly
different from setting a definition to nil (when the keymap has a
parent).

+++
*** 'read-multiple-choice' now takes an optional SHOW-HELP argument.
If non-nil, show the help buffer immediately, before any user input.

+++
*** New function 'key-valid-p'.
The 'kbd' function is quite permissive, and will try to return
something usable even if the syntax of the argument isn't completely
correct.  The 'key-valid-p' predicate does a stricter check of the
syntax.

---
*** New function 'key-parse'.
This is like 'kbd', but only returns vectors instead of a mix of
vectors and strings.

+++
*** New ':type' for 'defcustom' for keys.
The new 'key' type can be used for options that should be a valid key
according to 'key-valid-p'.  The type 'key-sequence' is now obsolete.

+++
** New substitution in docstrings and 'substitute-command-keys'.
Use \\`KEYSEQ' to insert a literal key sequence "KEYSEQ" (for example
\\`C-k') in a docstring or when calling 'substitute-command-keys',
which will use the same face as a command substitution.  This should
be used only when a key sequence has no corresponding command, for
example when it is read directly with 'read-key-sequence'.  It must be
a valid key sequence according to 'key-valid-p'.

+++
** New function 'file-name-split'.
This returns a list of all the components of a file name.

+++
** New macro 'with-undo-amalgamate'.
It records a particular sequence of operations as a single undo step.

+++
** New command 'yank-media'.
This command supports yanking non-plain-text media like images and
HTML from other applications into Emacs.  It is only supported in
modes that have registered support for it, and only on capable
platforms.

+++
** New command 'yank-media-types'.
This command lets you examine all data in the current selection and
the clipboard, and insert it into the buffer.

---
** New function 'minibuffer-lazy-highlight-setup'.
This function allows setting up the minibuffer so that lazy
highlighting of its content is applied in the original window.

+++
** New text property 'inhibit-isearch'.
If set, 'isearch' will skip these areas, which can be useful (for
instance) when covering huge amounts of data (that has no meaningful
searchable data, like image data) with a 'display' text property.

+++
** 'insert-image' now takes an INHIBIT-ISEARCH optional parameter.
It marks the image with the 'inhibit-isearch' text property, which
inhibits 'isearch' matching the STRING parameter.

---
** New function 'replace-regexp-function'.
It can be used to implement own regexp syntax for search/replace.

---
** New variables to customize defaults of FROM for 'query-replace*' commands.
The new variable 'query-replace-read-from-default' can be set to a
function that returns the default value of FROM when 'query-replace'
prompts for a string to be replaced.  An example of such a function is
'find-tag-default'.

The new variable 'query-replace-read-from-regexp-default' can be set
to a function (such as 'find-tag-default-as-regexp') that returns the
default value of FROM when 'query-replace-regexp' prompts for a regexp
whose matches are to be replaced.  If these variables are nil (which
is the default), 'query-replace' and 'query-replace-regexp' take the
default value from the previous FROM-TO pair.

---
** New user option 'pp-use-max-width'.
If non-nil, 'pp' will attempt to limit the line length when formatting
long lists and vectors.

---
** New function 'pp-emacs-lisp-code'.
'pp' formats general Lisp sexps.  This function does much the same,
but applies formatting rules appropriate for Emacs Lisp code.

+++
** New function 'file-has-changed-p'.
This convenience function is useful when writing code that parses
files at run-time, and allows Lisp programs to re-parse files only
when they have changed.

+++
** 'abbreviate-file-name' now respects magic file name handlers.

---
** New function 'font-has-char-p'.
This can be used to check whether a specific font has a glyph for a
character.

+++
** 'window-text-pixel-size' now accepts a new argument IGNORE-LINE-AT-END.
This controls whether or not the last screen line of the text being
measured will be counted for the purpose of calculating the text
dimensions.

+++
** 'window-text-pixel-size' understands a new meaning of FROM.
Specifying a cons as the FROM argument allows to start measuring text
from a specified amount of pixels above or below a position.

---
** 'eshell-eval-using-options' now follows argument syntax conventions.
Built-in commands in Eshell now accept command-line options with
values passed as a single token, such as '-oVALUE' or '--option=VALUE'.

** XDG support

---
*** New function 'xdg-state-home' returns 'XDG_STATE_HOME' environment variable.
This new location, introduced in the XDG Base Directory Specification
version 0.8 (8th May 2021), "contains state data that should persist
between (application) restarts, but that is not important or portable
enough to the user that it should be stored in $XDG_DATA_HOME".

+++
** New macro 'with-delayed-message'.
This macro is like 'progn', but will output the specified message if
the body takes longer to execute than the specified timeout.

---
** New function 'funcall-with-delayed-message'.
This function is like 'funcall', but will output the specified message
if the function takes longer to execute than the specified timeout.

** Locale

---
*** New variable 'current-locale-environment'.
This holds the value of the previous call to 'set-locale-environment'.

---
*** New macro 'with-locale-environment'.
This macro can be used to change the locale temporarily while
executing code.

** Tabulated List Mode

+++
*** A column can now be set to an image descriptor.
The 'tabulated-list-entries' variable now supports using an image
descriptor, which means to insert an image in that column instead of
text.  See the documentation string of that variable for details.

+++
** :keys in 'menu-item' can now be a function.
If so, it is called whenever the menu is computed, and can be used to
calculate the keys dynamically.

+++
** New major mode 'clean-mode'.
This is a new major mode meant for debugging.  It kills absolutely all
local variables and removes overlays and text properties.

+++
** 'kill-all-local-variables' can now kill all local variables.
If given the new optional KILL-PERMANENT argument, also kill permanent
local variables.

+++
** Third 'mapconcat' argument SEPARATOR is now optional.
An explicit nil always meant the empty string, now it can be left out.

---
** Themes can now be made obsolete.
Using 'make-obsolete' on a theme is now supported.  This will make
'load-theme' issue a warning when loading the theme.

+++
** New function 'define-keymap'.
This function allows defining a number of keystrokes with one form.

+++
** New macro 'defvar-keymap'.
This macro allows defining keymap variables more conveniently.

---
** 'kbd' can now be used in built-in, preloaded libraries.
It no longer depends on edmacro.el and cl-lib.el.

+++
** New function 'image-at-point-p'.
This function returns t if point is on a valid image, and nil
otherwise.

+++
** New function 'string-pixel-width'.
This returns the width of a string in pixels.  This can be useful when
dealing with variable pitch fonts and glyphs that have widths that
aren't integer multiples of the default font.

+++
** New function 'string-glyph-split'.
This function splits a string into a list of strings representing
separate glyphs.  This takes into account combining characters and
grapheme clusters.

---
** 'lookup-key' is more permissive when searching for extended menu items.
In Emacs 28.1, the behavior of 'lookup-key' was changed: 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]'.

This has been extended, so that when looking for a menu item with a
symbol containing spaces, as in '[menu-bar Foo\ Bar]', first look for
an exact match, then the lowercased '[menu-bar foo\ bar]' and finally
'[menu-bar foo-bar]'.  This further improves backwards-compatibility
when converting menus to use 'easy-menu-define'.

** xwidgets

+++
*** The function 'make-xwidget' now accepts an optional RELATED argument.
This argument is used as another widget for the newly created WebKit
widget to share settings and subprocesses with.  It must be another
WebKit widget.

+++
*** New function 'xwidget-perform-lispy-event'.
This function allows you to send events to xwidgets.  Usually, some
equivalent of the event will be sent, but there is no guarantee of
what the widget will actually receive.

On GTK+, only key and function key events are implemented.

+++
*** New function 'xwidget-webkit-load-html'.
This function is used to load HTML text into WebKit xwidgets
directly, in contrast to creating a temporary file to hold the
markup, and passing the URI of the file as an argument to
'xwidget-webkit-goto-uri'.

+++
*** New functions for performing searches on WebKit xwidgets.
Some new functions, such as 'xwidget-webkit-search', have been added
for performing searches on WebKit xwidgets.

+++
*** New function 'xwidget-webkit-back-forward-list'.
This function is used to obtain the history of page-loads in a given
WebKit xwidget.

+++
*** New function 'xwidget-webkit-estimated-load-progress'.
This function is used to obtain the estimated progress of page loading
in a given WebKit xwidget.

+++
*** New function 'xwidget-webkit-stop-loading'.
This function is used to terminate all data transfer during page loads
in a given WebKit xwidget.

+++
*** 'load-changed' xwidget events are now more detailed.
In particular, they can now have different arguments based on the
state of the WebKit widget.  'load-finished' is sent when a load has
completed, 'load-started' when a load first starts, 'load-redirected'
after a redirect, and 'load-committed' when the WebKit widget first
commits to the load.

+++
*** New event type 'xwidget-display-event'.
These events are sent whenever an xwidget requests that Emacs display
another xwidget.  The only arguments to this event are the xwidget
that should be displayed, and the xwidget that asked to display it.

+++
*** New function 'xwidget-webkit-set-cookie-storage-file'.
This function is used to control where and if an xwidget stores
cookies set by web pages on disk.

---
** New variable 'help-buffer-under-preparation'.
This variable is bound to t during the preparation of a "*Help*" buffer.

+++
** Timestamps like '(1 . 1000)' now work without warnings being generated.
For example, '(time-add nil '(1 . 1000))' no longer warns that the
'(1 . 1000)' acts like '(1000 . 1000000)'.  This warning, which was a
temporary transition aid for Emacs 27, has served its purpose.

+++
** 'encode-time' now also accepts a 6-element list with just time and date.
(encode-time (list SECOND MINUTE HOUR DAY MONTH YEAR)) is now short for
(encode-time (list SECOND MINUTE HOUR DAY MONTH YEAR nil -1 nil)).

+++
** 'date-to-time' now assumes earliest values if its argument lacks
month, day, or time.  For example, (date-to-time "2021-12-04") now
assumes a time of 00:00 instead of signaling an error.

+++
** 'format-seconds' now allows suppressing zero-value trailing elements.
The new "%x" non-printing control character will suppress zero-value
elements that appear after "%x".

+++
** New events for taking advantage of touchscreen devices.
The events 'touchscreen-begin, 'touchscreen-update', and
'touchscreen-end' have been added to take better advantage of
touch-capable display panels.

+++
** New error symbol 'permission-denied'.
This is a subcategory of 'file-error', and is signaled when some file
operation fails because the OS doesn't allow Emacs to access a file or
a directory.

+++
** The ':underline' face attribute now accepts a new property.
The property ':position' now specifies the position of the underline
when used as part of a property list specification for the
':underline' attribute.

+++
** 'defalias' records a more precise history of definitions.
This is recorded in the 'function-history' symbol property.

---
** 'indian-tml-base-table' no longer translates digits.
Use 'indian-tml-base-digits-table' if you want digits translation.

---
** 'indian-tml-itrans-v5-hash' no longer translates digits.
Use 'indian-tml-itrans-digits-v5-hash' if you want digits
translation.

+++
** 'shell-quote-argument' has a new optional parameter POSIX.
This is useful when quoting shell arguments for a remote shell
invocation.  Such shells are POSIX conform by default.

+++
** 'signal-process' now consults the list 'signal-process-functions'.
This is to determine which function has to be called in order to
deliver the signal.  This allows Tramp to send the signal to remote
asynchronous processes.  The hitherto existing implementation has been
moved to 'signal-default-interrupt-process'.

+++
** 'list-system-processes' returns remote process IDs now.
This happens, when the current buffer's 'default-directory' is
remote.  In order to preserve the old behavior, apply

    (let ((default-directory temporary-file-directory))
      (list-system-processes))

+++
** 'process-attributes' expects a remote process ID now.
When current buffer's 'default-directory' is remote, the PID argument
of 'process-attributes' is regarded as a remote process ID.  In order
to preserve the old behavior, apply

    (let ((default-directory temporary-file-directory))
      (process-attributes pid))


\f
* Changes in Emacs 29.1 on Non-Free Operating Systems

** MS-Windows

+++
*** Emacs now supports system dark mode.
On Windows 10 (version 1809 and higher) and Windows 11, Emacs will now
follow the system's dark mode: GUI frames use the appropriate light or
dark title bar and scroll bars, based on the user's Windows-wide color
settings.

---
*** Emacs now uses native image APIs to display some image formats.
On Windows 2000 and later, Emacs now defaults to using the native
image APIs for displaying the BMP, GIF, JPEG, PNG, and TIFF images.
This means Emacs on MS-Windows needs no longer use external image
support libraries to display those images.  Other image types -- XPM,
SVG, and WEBP -- still need support libraries for Emacs to be able to
display them.

The use of native image APIs is controlled by the variable
'w32-use-native-image-API', whose value now defaults to t on systems
where those APIs are available.

+++
*** Emacs now supports display of BMP images using native image APIs.
When 'w32-use-native-image-API' is non-nil, Emacs on MS-Windows now
has built-in support for displaying BMP images.

** Cygwin

---
*** 'process-attributes' is now implemented.

\f
----------------------------------------------------------------------
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 <https://www.gnu.org/licenses/>.

\f
Local variables:
coding: utf-8
mode: outline
mode: emacs-news
paragraph-separate: "[ 	\f]*$"
end: