NEWS

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

Copyright (C) 2010-2012  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 24.

See files NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, 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 the appropriate manual has already been updated.
 --- means no change in the manuals is called for.
When you add a new item, please add it without either +++ or ---
so we will look at it and add it to the manual.


* Installation Changes in Emacs 24.1

---
** Emacs can be compiled with Gtk+ 3.0 if you pass --with-x-toolkit=gtk3
to configure.  Note that other libraries used by Emacs, RSVG and GConf,
also depend on Gtk+.  You can disable them with --without-rsvg and
--without-gconf.

---
** Emacs can be compiled with GnuTLS support.
This happens by default if a suitably recent version of the library is
found at build time.  To prevent this, use the configure option
`--without-gnutls'.  See below for GnuTLS features.

---
** Emacs can be compiled with SELinux support.
This happens by default if a suitably recent version of the library is
found at build time.  To prevent this, use the configure option
`--without-selinux'.  See below for SELinux features.

---
** Emacs can be compiled with ImageMagick support.
This happens by default if a suitably recent version of the library is
found at build time.  To prevent this, use the configure option
`--without-imagemagick'.  See below for ImageMagick features.

---
** Emacs can be compiled with libxml2 support.
This happens by default if a suitably recent version of the library is
found at build time.  To prevent this, use the configure option
`--without-xml2'.  See below for libxml2 features.

---
** There is a new configure option --with-wide-int.
With it, Emacs integers typically have 62 bits, even on 32-bit machines.
On 32-bit hosts, this raises the limit on buffer sizes from about 512 MiB
to about 2 GiB.

---
** By default, the installed Info and man pages are compressed.
You can disable this by configuring --without-compress-info.

---
** There are new configure options:
--with-mmdf, --with-mail-unlink, --with-mailhost.
These provide no new functionality, they just remove the need to edit
lib-src/Makefile by hand in order to use the associated features.

---
** There is a new configure option --enable-use-lisp-union-type.
This is only useful for Emacs developers to debug certain types of bugs.
This is not a new feature; only the configure flag is new.

---
** The standalone programs digest-doc and sorted-doc are removed.
Emacs now uses Lisp commands `doc-file-to-man' and `doc-file-to-info'.

---
** The standalone program `fakemail' is removed.
If you need it, feedmail.el provides a superset of the functionality.


* Startup Changes in Emacs 24.1

---
** The --unibyte, --multibyte, --no-multibyte, and --no-unibyte
command line arguments, and the EMACS_UNIBYTE environment variable, no
longer have any effect.  (They were declared obsolete in Emacs 23.)

+++
** New command line option `--no-site-lisp' removes site-lisp directories
from load-path.  -Q now implies this.  This option does not affect the
EMACSLOADPATH environment variable (and hence has no effect for
Nextstep builds.)


* Changes in Emacs 24.1

+++
** auto-mode-case-fold is now enabled by default.

** Completion

*** shell-mode uses pcomplete rules, with the standard completion UI.
+++
*** Many packages have been changed to use `completion-at-point'
rather than their own completion code.
+++
*** `completion-at-point' now handles tags and semantic completion.
---
*** Completion in a non-minibuffer now tries to detect the end of completion
and pops down the *Completions* buffer accordingly.
+++
*** Completion can cycle, depending on completion-cycle-threshold.
+++
*** New completion style `substring'.
+++
*** Completion style can be set per-category `completion-category-overrides'.
+++
*** Completion of buffers now uses substring completion by default.

** Mail changes

+++
*** The default of `send-mail-function' is now `sendmail-query-once',
which asks the user (once) whether to use the smtpmail package to send
email, or to use the old defaults that rely on external mail
facilities (`sendmail-send-it' on GNU/Linux and other Unix-like
systems, and `mailclient-send-it' on Windows).

*** smtpmail changes

**** smtpmail now uses encrypted connections (via STARTTLS) if the
mail server supports them.  It also uses the auth-source framework for
getting credentials.

**** The variable `smtpmail-auth-credentials' has been removed.
That variable used to have the default value "~/.authinfo", in which
case you won't see any difference.  But if you changed it to be a list
of user names and passwords, that setting is now ignored; you will be
prompted for the user name and the password, which will then be saved
to ~/.authinfo.  (To control where and how the credentials are stored,
see the auth-source manual.  You may want to change the auth-source
preferences if you want to store the credentials encrypted, for
instance.)

You can also manually copy the credentials to your ~/.authinfo file.
For example, if you had

  (setq smtpmail-auth-credentials
        '(("mail.example.org" 25 "jim" "s!cret")))

then the equivalent line in ~/.authinfo would be

  machine mail.example.org port 25 login jim password s!cret

**** The variable `smtpmail-starttls-credentials' has been removed.

If you had that set, then you need to put

  machine smtp.whatever.foo port 25 key "~/.my_smtp_tls.key" cert "~/.my_smtp_tls.cert"

in your ~/.authinfo file instead.

*** Mail mode changes (this is the old Mail mode, not Message mode)
+++
**** New command `mail-add-attachment' for adding MIME attachments
---
**** The command `mail-attach-file' was renamed to `mail-insert-file'.
The old name is now an obsolete alias to the new name.

** Emacs server and client changes
+++
*** New option `server-port' specifies the port on which the Emacs
server should listen.
+++
*** New emacsclient argument -q/--quiet suppresses some status messages.
+++
*** New emacsclient argument --frame-parameters can be used to set the
frame parameters of a newly-created graphical frame.
+++
*** If emacsclient shuts down as a result of Emacs signaling an
error, its exit status is 1.
+++
*** New emacsclient argument --parent-id ID.
This opens a client frame in parent X window ID, via XEmbed, similar
to the --parent-id argument to Emacs.

** Internationalization changes

+++
*** Emacs now supports display and editing of bidirectional text.

Text that includes characters from right-to-left (RTL) scripts, such
as Arabic, Farsi, or Hebrew, is displayed in the correct visual order
as expected by users of those scripts.  This display reordering is a
"Full bidirectionality" class implementation of the Unicode
Bidirectional Algorithm.  Buffers with no RTL text should look exactly
the same as before.

For more information, see the node "Bidirectional Editing" in the
Emacs Manual.

+++
**** New buffer-local variable `bidi-display-reordering'.
To disable display reordering in any given buffer, change this to nil.

+++
**** New buffer-local variable `bidi-paragraph-direction'.
If nil (the default), Emacs determines the base direction of each
paragraph from its text, as specified by the Unicode Bidirectional
Algorithm.

Setting this to `right-to-left' or `left-to-right' forces a particular
base direction on each paragraph in the buffer.

Paragraphs whose base direction is right-to-left are displayed
starting at the right margin of the window.

+++
*** Enhanced support for characters with no glyphs in available fonts.
If a character has no glyphs in any of the available fonts, Emacs
normally displays it either as a hexadecimal code in a box or as a
thin 1-pixel space.  In addition to these two methods, Emacs can
display these characters as empty box, as an acronym, or not display
them at all.  To change how these characters are displayed, customize
the variable `glyphless-char-display-control'.

On character terminals, these methods are used for characters that
cannot be encoded by the `terminal-coding-system'.

---
*** New input methods for Farsi: farsi and farsi-translit.

+++
*** `nobreak-char-display' now also highlights Unicode hyphen chars
(U+2010 and U+2011).

---
*** New translation of the Emacs Tutorial in Hebrew is available.
Type `C-u C-h t' to choose it in case your language setup doesn't
automatically select it.

** Improved GTK integration
+++
*** GTK scroll-bars are now placed on the right by default.
Use `set-scroll-bar-mode' to change this.
+++
*** GTK tool bars can have just text, just images or images and text.
Customize `tool-bar-style' to choose style.  On a Gnome desktop, the default
is taken from the desktop settings.
---
*** GTK tool bars can be placed on the left/right or top/bottom of the frame.
The frame-parameter tool-bar-position controls this.  It takes the values
top, left, right or bottom.  The Options => Show/Hide menu has entries
for this.
+++
*** The colors for selected text (the `region' face) are taken from
the GTK theme when Emacs is built with GTK.
+++
*** Emacs uses GTK tooltips by default if built with GTK.  You can turn that
off by customizing x-gtk-use-system-tooltips.

+++
** New basic faces `error', `warning', `success' are available to
highlight strings that indicate failure, caution or successful operation.

---
** Lucid menus and dialogs can display antialiased fonts if Emacs is built
with Xft.  To change font, use the X resource font, for example:
Emacs.pane.menubar.font:  Courier-12

+++
** On graphical displays, the mode-line no longer ends in dashes.
Also, the first dash (which does not indicate anything) is just
displayed as a space.

+++
** Basic SELinux support has been added.
This requires Emacs to be linked with libselinux at build time.

+++
*** Emacs preserves the SELinux file context when backing up, and
optionally when copying files. To this end, copy-file has an extra
optional argument, and backup-buffer and friends include the SELinux
context in their return values.

+++
*** The new functions file-selinux-context and set-file-selinux-context
get and set the SELinux context of a file.
---
*** Tramp offers handlers for file-selinux-context and set-file-selinux-context
for remote machines which support SELinux.

** Changes for exiting Emacs
+++
*** The function kill-emacs is now run upon receipt of the signals
SIGTERM and SIGHUP, and upon SIGINT in batch mode.
+++
*** kill-emacs-hook is now also run in batch mode.
If you have code that adds something to kill-emacs-hook, you should
consider if it is still appropriate to add it in the noninteractive case.

** Scrolling changes
+++
*** New scrolling commands `scroll-up-command' and `scroll-down-command'
(bound to C-v/[next] and M-v/[prior]) do not signal errors at top/bottom
of buffer at first key-press (instead move to top/bottom of buffer)
when `scroll-error-top-bottom' is non-nil.
+++
*** New variable `scroll-error-top-bottom' (see above).
+++
*** New scrolling commands `scroll-up-line' and `scroll-down-line'
scroll a line instead of full screen.
+++
*** New property `scroll-command' should be set on a command's symbol to
define it as a scroll command affected by `scroll-preserve-screen-position'.
+++
*** If you customize `scroll-conservatively' to a value greater than 100,
Emacs will never recenter point in the window when it scrolls due to
cursor motion commands or commands that move point (e.f., `M-g M-g').
Previously, you needed to use `most-positive-fixnum' as the value of
`scroll-conservatively' to achieve the same effect.
---
*** ``Aggressive'' scrolling now honors the scroll margins.
If you customize `scroll-up-aggressively' or
`scroll-down-aggressively' and move point off the window, Emacs now
scrolls the window so as to avoid positioning point inside the scroll
margin.

** Trash changes
+++
*** `delete-by-moving-to-trash' now only affects commands that specify
trashing.  This avoids inadvertently trashing temporary files.
+++
*** Calling `delete-file' or `delete-directory' with a prefix argument
now forces true deletion, regardless of `delete-by-moving-to-trash'.

** New option `list-colors-sort' defines the color sort order
for `list-colors-display'.

** An Emacs Lisp package manager is now included.
This is a convenient way to download and install additional packages,
from a package repository at http://elpa.gnu.org.
+++
*** `M-x list-packages' shows a list of packages, which can be
selected for installation.
+++
*** New command `describe-package', bound to `C-h P'.
+++
*** By default, all installed packages are loaded and activated
automatically when Emacs starts up.  To disable this, set
`package-enable-at-startup' to nil.  To change which packages are
loaded, customize `package-load-list'.

** Custom Themes
+++
*** `M-x customize-themes' lists Custom themes which can be enabled.
+++
*** New option `custom-theme-load-path' is the load path for themes.
Emacs no longer looks for custom themes in `load-path'.  The default
is to search in `custom-theme-directory', followed by a built-in theme
directory named "themes/" in `data-directory'.
+++
*** New option `custom-safe-themes' records known-safe theme files.
If a theme is not in this list, Emacs queries before loading it, and
offers to save the theme to `custom-safe-themes' automatically.  By
default, all themes included in Emacs are treated as safe.

** The user option `remote-file-name-inhibit-cache' controls whether
the remote file-name cache is used for read access.

** File- and directory-local variable changes
+++
*** You can stop directory local vars from applying to subdirectories.
Add an element (subdirs . nil) to the alist portion of any variables
settings to indicate that the section should not apply to
subdirectories.
+++
*** Directory local variables can apply to some file-less buffers.
Affected modes include dired, vc-dir, and log-edit.  For example,
adding "(diff-mode . ((mode . whitespace)))" to .dir-locals.el will
turn on `whitespace-mode' for *vc-diff* buffers.  Modes should call
`hack-dir-local-variables-non-file-buffer' to support this.
+++
*** Using "mode: MINOR-MODE" to enable a minor mode is deprecated.
Instead, use "eval: (minor-mode 1)".

+++
*** The variable `inhibit-first-line-modes-regexps' has been renamed
to `inhibit-local-variables-regexps'.  As the name suggests, it now
applies to ALL file local variables, not just -*- mode ones.
The associated `inhibit-first-line-modes-suffixes' has been renamed
in the corresponding way.

+++
** The variable `focus-follows-mouse' now always defaults to nil.

** New primitive `secure-hash' that supports many secure hash algorithms
including md5, sha-1 and sha-2 (sha-224, sha-256, sha-384 and sha-512).
The elisp implementation sha1.el is removed. Feature sha1 is provided
by default.

** Menu-bar changes
---
*** `menu-bar-select-buffer-function' lets you choose another operation
instead of `switch-to-buffer' when selecting an item in the Buffers menu.

** Window changes

+++
*** Resizing an Emacs frame now preserves proportional window sizes,
modulo restrictions like window minimum sizes and fixed-size windows.

*** The behavior of `display-buffer' is now customizable in detail.
+++
**** New option `display-buffer-base-action' specifies a list of
user-determined display "actions" (functions and optional arguments
for choosing the displaying window).

This takes precedence over the default display action, which is
specified by `display-buffer-fallback-action'.

+++
**** New option `display-buffer-alist' maps buffer name regexps to
display actions, taking precedence over `display-buffer-base-action'.

+++
*** New option `window-combination-limit'.
The new option `window-combination-limit' allows to return the space
obtained for resizing or creating a window more reliably to the window
from which such space was obtained.

+++
*** New option `window-combination-resize'.
The new option `window-combination-resize' allows to split a window that
otherwise cannot be split because it's too small by stealing space from
other windows in the same combination.  Subsequent resizing or deletion
of the window will resize all windows in the same combination as well.

+++
*** New commands `maximize-window' and `minimize-window'.
These maximize and minimize the size of a window within its frame.

+++
*** New commands `switch-to-prev-buffer' and `switch-to-next-buffer'.
These functions allow to navigate through the live buffers that have
been shown in a specific window.

** The inactive minibuffer has its own major mode `minibuffer-inactive-mode'.
This is handy for minibuffer-only frames, and is also used for the "mouse-1
pops up *Messages*" feature, which can now easily be changed.

---
** `tooltip-use-echo-area' is obsolete.
Rather than setting this to t, disable Tooltip mode instead.


* Editing Changes in Emacs 24.1

** Search changes
+++
*** C-y in Isearch is now bound to isearch-yank-kill, instead of
isearch-yank-line.
+++
*** M-y in Isearch is now bound to isearch-yank-pop, instead of
isearch-yank-kill.
+++
*** M-s C-e in Isearch is now bound to isearch-yank-line.

+++
** New commands `count-words-region' and `count-words'.

*** `count-lines-region' is now an alias for `count-words-region',
bound to M-=, which shows the number of lines, words, and characters.

+++
** The default value of `backup-by-copying-when-mismatch' is now t.

+++
** The command `just-one-space' (M-SPC), if given a negative argument,
also deletes newlines around point.

** Deletion changes
+++
*** New option `delete-active-region'.
If non-nil, [delete] and DEL delete the region if it is active and no
prefix argument is given.  If set to `kill', these commands kill
instead.
+++
*** New command `delete-forward-char', bound to [delete].
This is meant for interactive use, and obeys `delete-active-region'.
The command `delete-char' does not obey `delete-active-region'.
---
*** `delete-backward-char' is now a Lisp function.
Apart from obeying `delete-active-region', its behavior is unchanged.
However, the byte compiler now warns if it is called from Lisp; you
should use delete-char with a negative argument instead.
---
*** The option `mouse-region-delete-keys' has been deleted.

** Selection changes.

The default handling of clipboard and primary selections was changed
to conform with modern X applications.  In short, most commands for
killing and yanking text now use the clipboard, while mouse commands
use the primary selection.

In the following, we provide a list of these changes, followed by a
list of steps to get the old behavior back if you prefer that.

+++
*** `select-active-regions' now defaults to t.
Merely selecting text (e.g. with drag-mouse-1) no longer puts it in
the kill ring.  The selected text is put in the primary selection, if
the system possesses a separate primary selection facility (e.g. X).

+++
**** `select-active-regions' also accepts a new value, `only'.
This means to only set the primary selection for temporarily active
regions (usually made by mouse-dragging or shift-selection);
"ordinary" active regions, such as those made with C-SPC followed by
point motion, do not alter the primary selection.

---
**** `mouse-drag-copy-region' now defaults to nil.

+++
*** mouse-2 is now bound to `mouse-yank-primary'.
This pastes from the primary selection, ignoring the kill-ring.
Previously, mouse-2 was bound to `mouse-yank-at-click'.

+++
*** `x-select-enable-clipboard' now defaults to t on all platforms.
+++
*** `x-select-enable-primary' now defaults to nil.
Thus, commands that kill text or copy it to the kill-ring (such as
M-w, C-w, and C-k) also use the clipboard---not the primary selection.

---
**** The "Copy", "Cut", and "Paste" items in the "Edit" menu are now
exactly equivalent to, respectively M-w, C-w, and C-y.

---
**** Note that on MS-Windows, `x-select-enable-clipboard' was already
non-nil by default, as Windows does not support the primary selection
between applications.

---
*** To return to the previous behavior, do the following:
**** Change `select-active-regions' to nil.
**** Change `mouse-drag-copy-region' to t.
**** Change `x-select-enable-primary' to t (on X only).
**** Change `x-select-enable-clipboard' to nil.
**** Bind `mouse-yank-at-click' to mouse-2.

+++
*** Support for X cut buffers has been removed.

*** X clipboard managers are now supported.
To inhibit this, change `x-select-enable-clipboard-manager' to nil.

+++
** New command `rectangle-number-lines', bound to `C-x r N', numbers
the lines in the current rectangle.  With a prefix argument, this
prompts for a number to count from and for a format string.

+++
** The default value of redisplay-dont-pause is now t
This makes Emacs feel more responsive to editing commands that arrive
at high rate, e.g. if you lean on some key, because stopping redisplay
in the middle (when this variable is nil) forces more expensive
updates later on, and Emacs appears to be unable to keep up.

+++
** The behavior of <TAB> for active regions in Text mode has changed.
In Text and related modes, typing <TAB> (`indent-for-tab-command')
when the region is active causes Emacs to indent all the lines in the
region, aligning them with the line previous to the first line in the
region (or with the left margin if there is no previous line).


* Changes in Specialized Modes and Packages in Emacs 24.1

+++
** Archive Mode has basic support for browsing and updating 7z archives.

+++
** browse-url has a new variable `browse-url-mailto-function'
specifies how mailto: URLs are handled.  The default is `browse-url-mail'.

---
** BibTeX mode

*** BibTeX mode now supports biblatex.
Use the variable bibtex-dialect to select support for different BibTeX
dialects.  bibtex-entry-field-alist is now an obsolete alias for
bibtex-BibTeX-entry-alist.

*** New command `bibtex-search-entries' bound to C-c C-a.

*** New `bibtex-entry-format' option `sort-fields', disabled by default.

*** New variable `bibtex-search-entry-globally'.

** Calendar, Diary, and Appt

+++
*** Diary entries can contain non-printing `comments'.
See the variable `diary-comment-start'.

+++
*** Appointments can specify their individual warning times.
See the variable `appt-warning-time-regexp'.

---
*** The function specified by `appt-disp-window-function' may be passed
lists of arguments if multiple appointments are due at similar times.
If you are using a custom function for this, you should update it.

+++
*** New function `diary-hebrew-birthday'.

---
*** Elements of `calendar-day-abbrev-array' and `calendar-month-abbrev-array'
may no longer be nil, but must all be strings.

---
*** The obsolete (since Emacs 22.1) method of enabling the appt package
by adding appt-make-list to diary-hook has been removed.  Use appt-activate.

---
*** Some appt variables (obsolete since Emacs 22.1) have been removed:
appt-issue-message (use the function appt-activate)
appt-visible/appt-msg-window (use the variable appt-display-format)

---
*** Some diary function aliases (obsolete since Emacs 22.1) have been removed:
view-diary-entries, list-diary-entries, show-all-diary-entries

** CC Mode (C, C++, etc.)

*** New feature to "guess" the style in an existing buffer.

** comint and modes derived from it use the generic completion code.

** Compilation mode
---
*** Compilation mode can be used without font-lock-mode.
`compilation-parse-errors-function' is now obsolete.

*** `compilation-filter-start' is let-bound to the start of the text
inserted by the compilation filter function, when calling
compilation-filter-hook.

*** `compilation-error-screen-columns' is obeyed in the editing buffer.
So programming language modes can set it, whereas previously only the value
in the *compilation* buffer was used.

** Customize

+++
*** Customize buffers now contain a search field.
The search is performed using `customize-apropos'.
To turn off the search field, set custom-search-field to nil.

+++
*** Custom options now start out hidden if at their default values.
Use the arrow to the left of the option name to toggle visibility.

*** custom-buffer-sort-alphabetically now defaults to t.

+++
*** The color widget now has a "Choose" button, which allows you to
choose a color via list-colors-display.

** D-Bus

*** It is possible now, to access alternative buses than the default
system or session bus.

*** dbus-register-{service,method,property}
The -method and -property functions do not automatically register
names anymore.

The new function dbus-register-service registers a service known name
on a D-Bus without simultaneously registering a property or a method.

** Dired-x
---
*** dired-jump and dired-jump-other-window called with a prefix argument
read a file name from the minibuffer instead of using buffer-file-name.

+++
*** The `dired local variables' feature provided by Dired-x is obsolete.
The standard directory local variables feature replaces it.

** ERC changes

*** New vars `erc-autojoin-timing' and `erc-autojoin-delay'.
If the value of `erc-autojoin-timing' is 'ident, ERC autojoins after a
successful NickServ identification, or after `erc-autojoin-delay'
seconds.  The default value, 'ident, means to autojoin immediately
after connecting.

*** New variable `erc-coding-system-precedence': If we use `undecided'
as the server coding system, this variable will then be consulted.
The default is to decode strings that can be decoded as utf-8 as
utf-8, and do the normal `undecided' decoding for the rest.

** Eshell changes

*** The default value of eshell-directory-name is a directory named
"eshell" in `user-emacs-directory'.  If the old "~/.eshell/" directory
exists, that is used instead.

** gdb-mi
+++
*** GDB User Interface migrated to GDB Machine Interface and now
supports multithread non-stop debugging and debugging of several
threads simultaneously.

** In ido-mode, C-v is no longer bound to ido-toggle-vc.
The reason is that this interferes with cua-mode.

** Image mode

*** RET (`image-toggle-animation') toggles animation, if the displayed
image can be animated.

*** Option `image-animate-loop', if non-nil, loops the animation.
If nil, `image-toggle-animation' plays the animation once.

** Info

*** New command `info-display-manual' displays an Info manual
specified by its name.  If that manual is already visited in some Info
buffer within the current session, the command will display that
buffer.  Otherwise, it will load the manual and display it.  This is
handy if you have many manuals in many Info buffers, and don't
remember the name of the buffer visiting the manual you want to
consult.

+++
*** `e' is now bound to `end-of-buffer' rather than to `Info-edit'.
This is for compatibility with the stand-alone Info reader program,
and also because `Info-edit' is a rarely used command that is disabled
by default.

+++
** The Landmark game is now invoked with `landmark', not `lm'.

** MH-E has been upgraded to MH-E version 8.3.1.
See MH-E-NEWS for details.

** Modula-2 mode provides auto-indentation.

** mpc.el: Can use pseudo tags of the form tag1|tag2 as a union of two tags.

** Prolog mode has been completely revamped, with lots of additional
functionality such as more intelligent indentation, electricity, support for
more variants, including Mercury, and a lot more.

** Rmail

*** The command `rmail-epa-decrypt' decrypts OpenPGP data
in the Rmail incoming message.

---
*** The variable `rmail-message-filter' no longer has any effect.
This change was made in Emacs 23.1 but was not advertised at the time.
Try using `rmail-show-message-hook' instead.

** Shell mode
+++
*** Shell mode uses pcomplete rules, with the standard completion UI.
+++
*** The `shell' command prompts for the shell path name if the default
directory is a remote file name and neither the environment variable
$ESHELL nor the variable `explicit-shell-file-name' is set.

---
** SQL Mode enhancements.

*** `sql-dialect' is an alias for `sql-product'.

*** New variable `sql-port' specifies the port number for connecting
to a MySQL or Postgres server.

*** The command `sql-product-interactive' now takes a prefix argument,
which causes it to prompt for an SQL product instead of the current
value of `sql-product'.

*** Product-specific SQL interactive commands now take prefix args.
These commands (`sql-sqlite', `sql-postgres', `sql-mysql', etc.),
given a prefix argument, prompt for a name for the SQL interactive
buffer.  This reduces the need for calling `sql-rename-buffer'.

*** SQL interactive modes suppress command continuation prompts, and
replace tabs with spaces.  The first change impacts multiple line SQL
statements entered with C-j between each line, statements yanked into
the buffer and statements sent with `sql-send-*' functions.  The
second change prevents the MySQL and Postgres interpreters from
listing object name completions when sent text via `sql-send-*'
functions.

*** New custom variables control prompting for login parameters.
Each supported product has a custom variable `sql-*-login-params',
which is a list of the parameters to be prompted for before a
connection is established.

*** New variable `sql-connection-alist' for login parameter values.
This can be used to store different username, database and server
values.  Connections defined in this variable appear in the submenu
SQL->Start... for making new SQLi sessions.

*** New command `sql-connect' starts a predefined SQLi session,
using the login parameters from `sql-connection-alist'.

*** New "Save Connection" menu item in SQLi buffers.
This gathers the login params specified for the SQLi session, if it
was not started by a connection, and saves them as a new connection.

*** Commands for listing database objects and details.
In an SQLi session, you can get a list of objects in the database.
The contents of these lists are product specific.

**** `C-c C-l a' or the "SQL->List all objects" menu item
lists all the objects in the database.  With a prefix argument, it
displays additional details or extend the listing to include other
schemas objects.

**** `C-c C-l t' or the "SQL->List Table details" menu item
prompts for the name of a database table or view and displays the list
of columns in the relation.  With a prefix argument, it displays
additional details about each column.

*** New options `sql-send-terminator' and `sql-oracle-scan-on'.

*** An API for manipulating SQL product definitions has been added.

** TeX modes

*** latex-electric-env-pair-mode keeps \begin..\end matched on the fly.

** Tramp
---
*** There exists a new inline access method "ksu" (kerberized su).
---
*** The following access methods are discontinued: "ssh1_old",
"ssh2_old", "scp1_old", "scp2_old", "imap", "imaps" and "fish".
---
*** The option `ange-ftp-binary-file-name-regexp' has changed its
default value to "".

** `url-queue-retrieve' downloads web pages asynchronously, but allow
controlling the degree of parallelism.

** VC and related modes

+++
*** Support for pulling on distributed version control systems.
`C-x v +' (`vc-pull') runs a "pull" operation, if it is supported, to
update the current branch and working tree.  A prefix argument means
to prompt the user for specifics, e.g. a pull location.

**** `vc-update' is now an alias for `vc-pull'.

**** Currently supported by Bzr, Git, and Mercurial.

+++
*** Support for merging on distributed version control systems.
The vc-merge command now runs a "merge" operation, if it is supported,
to merge changes from another branch into the current one.  It prompts
for specifics, e.g. a merge source.

**** Currently supported for Bzr, Git, and Mercurial.

+++
*** New option `vc-revert-show-diff' controls whether `vc-revert'
shows a diff while querying the user.  It defaults to t.

+++
*** Log entries in some Log View buffers can be toggled to display a
longer description by typing RET (log-view-toggle-entry-display).
In the Log View buffers made by `C-x v L' (vc-print-root-log), you can
use this to display the full log entry for the revision at point.

**** Currently supported for Bzr, Git, and Mercurial.

**** Packages using Log View mode can enable this functionality by
binding `log-view-expanded-log-entry-function' to a suitable function.

+++
*** New command `vc-ediff' allows visual comparison of two revisions
of a file similar to `vc-diff', but using ediff backend.

+++
*** The option `vc-initial-comment' was removed in Emacs 23.2, but
this was not advertised at the time.

+++
*** `vc-toggle-read-only' is an obsolete alias for `toggle-read-only'.
Since Emacs 23, it has done the same thing as `toggle-read-only', but
this was not advertised at the time.

** FIXME: xdg-open for browse-url and reportbug, 2010/08.

** Obsolete modes

*** partial-completion-mode is obsolete.
You can get a comparable behavior with:
(setq completion-styles '(partial-completion initials))
(setq completion-pcm-complete-word-inserts-delimiters t)

*** pc-mode.el is obsolete.

*** sregex.el is obsolete, since rx.el is a strict superset.

*** s-region.el and pc-select are obsolete.
They are superseded by shift-select-mode enabled by default in 23.1.

** Miscellaneous

+++
*** f90.el has some support for Fortran 2008 syntax.

---
*** `copyright-fix-years' can optionally convert consecutive years to ranges.

+++
*** New command `nato-region' converts text to NATO phonetic alphabet.


* New Modes and Packages in Emacs 24.1