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GNU Emacs NEWS -- history of user-visible changes.
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Copyright (C) 2007, 2008 Free Software Foundation, Inc.
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See the end of the file for license conditions.
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Please send Emacs bug reports to emacs-pretest-bug@gnu.org.
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If possible, use M-x report-emacs-bug.

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This file is about changes in Emacs version 23.
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See files NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18, and NEWS.1-17
for changes in older Emacs versions.
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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.
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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.

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* About external Lisp packages

26

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* Installation Changes in Emacs 23.1
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** The default X toolkit is now Gtk+, rather than Lucid.

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** Fonts are handled by new code capable of dealing with multiple font
backends.  This requires the freetype and fontconfig libraries, and
supports local fonts (fonts installed on the machine where Emacs is
running).  Additionally, the Xft library can be used for antialiasing
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support, the otf library for complex text layout by OpenType fonts,
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and the m17n library for text shaping.  Emacs now accepts font names
supplied in the fontconfig format (e.g. "monospace-12:bold") and GTK
format (e.g. "Monospace Bold 12").
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** The new configuration option "--with-dbus" enables D-Bus language
bindings for Emacs.

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** The Mac Carbon port is no longer supported.
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Instead, use... [FIXME what?]
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** configure now checks for libgif before libungif when searching for
a GIF library.
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** Support for systems without alloca has been removed.

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** Support for Sun windows has been removed.

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** Support for many obsolete platforms has been removed.
See the list at the end of etc/MACHINES for details.

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** The `emacstool' utility has been removed.

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** The configure options `--with-gcc', `--without-gcc' have been removed.
Configure will use gcc by default.  Set the CC environment variable if
you need control over which C compiler is used.

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** The configure option `--with-gtk' has been removed.  Gtk is now the
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default toolkit, but you can use --with-x-toolkit=gtk if necessary.
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* Changes in Emacs 23.1

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** Info displays breadcrumbs in the header of the page.
See Info-breadcrumbs-depth to control it.

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** Emacs now supports serial port access on GNU/Linux, Unix, and
Windows.  `serial-term' starts an interactive terminal,
`make-serial-process' and `serial-process-configure' provide a Lisp
interface.  The serial port can be configured at runtime with the
mode-line mouse menu.

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** Apropos
*** `apropos-library' describes the elements defined in a given library.
*** Set `apropos-compact-layout' is you want a more compact (but wider) layout.
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** scroll-preserve-screen-position also preserves the column position.
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** Completion.
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*** `completion-styles' can be customized to choose your favorite completion.
*** The default completion styles include a form of partial-completion.
*** The new command `minibuffer-force-complete chooses one of the possible
completions, rather than stopping at the common prefix.
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*** `completion-auto-help' can be set to `lazy' to list the completions only
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if you repeat the completion.  This was already supported in
`partial-completion-mode'.

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** Emacs now supports using both X displays and ttys in one session.
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Start the server (M-x server-start).  Then `emacsclient -t' creates a
tty frame connected to the running emacs server.  You can also use any
number of different ttys.  `emacsclient -c' creates a new X11 frame on
the current $DISPLAY or a tty frame if $DISPLAY is not set.
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You can test for the presence of this feature in your Lisp code by
testing for the `multi-tty' feature.

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** The Emacs character set is now a superset of Unicode.
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(It has about four times the code space, which should be plenty).

The internal encoding used for buffers and strings is now
Unicode-based and called `utf-8-emacs'.  utf-8-emacs is backwards
compatible with the UTF-8 encoding of Unicode.  The `emacs-mule'
coding system can still read and write data in the old internal encoding.

Since the internal encoding is also used by default for byte-compiled
files -- i.e. the normal coding system for byte-compiled Lisp files is
now utf-8-Emacs -- Lisp containing non-ASCII characters which is
compiled by Emacs 23 can't be read by earlier versions of Emacs.  Files
compiled by Emacs 20, 21, or 22 are loaded correctly as emacs-mule
(whether or not they contain multibyte characters), which makes loading
them somewhat slower than Emacs 23-compiled files.  Thus it may be worth
recompiling existing .elc files which don't need to be shared with older
Emacsen.

** There are assorted new coding systems/aliases -- see M-x list-coding-systems.

** There is a new charset implementation with many new charsets.
See M-x list-character-sets.  New charsets can be defined conveniently
as tables of unicodes.

The dimension of a charset is now 1, 2, 3, or 4, and the size of each
dimension is no longer limited to 94 or 96.

A dynamic charset priority list is used to infer the charset of
characters for display.

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** There are new Chinese-GBK, Chinese-GB18030, Khmer, Bengali,
Punjabi, Gujarati, Oriya, Telugu, Sinhala, and TaiViet language
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environments.

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** Emacs now supports the XEmbed specification.
You can embed Emacs in another application on X11.  The new command line option
--parent-id is used to pass the parent window id to Emacs.  See
http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
for details about XEmbed.

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** Controlling the frame opacity
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The opacity of a frame can now be controlled by setting
the `alpha' frame parameter, on a compositing window manager
(e.g. Compiz, Beryl and Compiz Fusion) for the X Window System.
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The alpha parameter should be an integer between 0 (transparent) and
100 (opaque) or a float number between 0.0 and 1.0.  Optionally, the
opacity can be set by a cons cell; the first item controls the
opacity of an active frame, and the second item controls that of
non-active frames.

 (set-frame-parameter nil 'alpha 80)
 (set-frame-parameter nil 'alpha 0.8)
 (set-frame-parameter nil 'alpha '(100 70)) ; (<active> [<inactive>])
 (set-frame-parameter nil 'alpha nil)

Note that the threshold opacity of a frame is defined by the variable
`frame-alpha-lower-limit' (default 20), so that the user may not lose
control of the frame.
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** Emacs comes with a new set of default icons.
Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
The Emacs 22 icon is available as `emacs22.png' in the same location.
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** Built-in functions (subr) can now have an interactive specification
that is not a prompt string.  If the `intspec' parameter of a `DEFUN'
starts with a `(', the string is evaluated as a Lisp form.

** set-file-modes is now interactive and can take the mode value in
symbolic notation thanks to auxiliary functions.

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** Changes affecting display-buffer
*** New value nil for split-height-threshold inhibits vertical splitting
unless there's no other window.
*** New option split-width-threshold controls horizontal splitting.
*** A window can be split horizontally even when it's not full-width.
*** New option split-window-preferred-function can be set to a function
to override the default splitting mechanism of display-buffer.
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** Menu Bar changes

*** The Options menu contains a new entry to turn on Longlines mode.

*** In the Options menu, the "Set Default Font" item applies the
selected font to the `default' face on all frames, not just the
current frame.  This font setting will be saved if the "Save Options"
item is used.  Furthermore, if Emacs is compiled with both GTK and
Fontconfig support, the "Set Default Font" item uses the GTK font
selection dialog instead of an Emacs pop-up menu.

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** Emacsclient has been extended to support opening a new terminal
frame.  Its behavior has been changed to open a new Emacs frame by
default.  Use the -c option to get the old behavior of opening files in
the currently selected Emacs frame.

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** The refcards are now shipped as PDF files.

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** Emacs now supports the SVG image format through librsvg2.

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** If you set find-file-confirm-nonexistent-file to t, then C-x C-f
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requires confirmation before opening a non-existent file.

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** If the gpm mouse server is running and t-mouse-mode enabled, Emacs uses a
Unix socket in a GNU/Linux console to talk to server, rather than faking events
using the client program mev.  This C level approach provides mouse
highlighting, and help echoing in the minibuffer.

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** Recentering changes

*** The new variable next-error-recenter specifies how next-error should
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recenter the visited source file.  Its value can be a number (for example,
0 for top line, -1 for bottom line), or nil for no recentering.

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*** New command recenter-top-bottom moves the current line to window
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center, top and bottom on successive invokations.

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*** C-l is bound to the new command recenter-top-bottom, rather than recenter.
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** The mode-line displays a `@' if the default-directory for the current buffer
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is on a remote machine, or a hyphen otherwise.
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** The mode-line displays a mode menu when mouse-1 is clicked on a minor mode,
in the same way as it already did for major modes.

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** The new command balance-windows-area balances windows both vertically
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and horizontally.
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** The new command close-display-connection can be used to close a connection
to a remote display, e.g. because the display is about to become unreachable.
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** The command shell prompts for the default directory, when it is
called with a prefix, and the default directory is a remote file name.
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This is because some file name handlers (like ange-ftp) are not able to
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run processes remotely.
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** The new command `display-time-world' starts an updating time display
using several time zones, in a buffer.
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** Directory-local variables are now found in .dir-settings.el.  See
also `set-directory-project' and `define-project-bindings'.

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** The new function `format-seconds' converts a number of seconds into a
readable string of days, hours, etc.

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** The new variables `before-init-time' and `after-init-time' record the
value of `current-time' before and after Emacs loads the init files.
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** The new function `emacs-uptime' returns the uptime of an Emacs instance.

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** The new function `emacs-init-time' returns the duration of the
Emacs initialization.

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** The minor modes unify-8859-on-encoding-mode, unify-8859-on-decoding-mode
are obsolete.

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** The new commands `pp-macroexpand-expression' and `pp-macroexpand-last-sexp'
pretty-print macro expansions.

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* Startup Changes in Emacs 23.1
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** The option `inhibit-startup-screen' (with aliases to old names
`inhibit-splash-screen' and `inhibit-startup-message') doesn't inhibit
display of the initial message in the *scratch* buffer.  If you don't
want to display the initial message in the *scratch* buffer at startup,
you can set the option `initial-scratch-message' to nil.

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** New user option `initial-buffer-choice' specifies what to display
after starting Emacs: startup screen, *scratch* buffer, visiting a
file or directory.

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** New alias `argv' for `command-line-args-left'
This is a convenience alias, so that one can write `(pop argv)'
inside of --eval command line arguments in order to access
following arguments.
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** The abbrev file is no longer read at startup in batch mode.
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* Incompatible Editing Changes in Emacs 23.1
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+++
** In Dired-x, all command guesses for ! are now added to the default
list accessible by M-n instead of pushing all guesses temporarily into
the history list.

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** The following input methods were removed in Emacs 22.2, but this was
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not advertised: danish-alt-postfix, esperanto-alt-postfix,
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finnish-alt-postfix, german-alt-postfix, icelandic-alt-postfix,
norwegian-alt-postfix, scandinavian-alt-postfix, spanish-alt-postfix,
and swedish-alt-postfix.  Use the versions without "alt-", which are
identical.
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* Editing Changes in Emacs 23.1
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** Mark changes

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*** Transient Mark mode is now on by default.

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*** mark-even-if-inactive now defaults to t

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*** When Transient Mark mode is on, C-SPC C-SPC pushes a mark without activating it.
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*** When Transient Mark mode is on, M-q now fills the region if the
region is active.  Otherwise, it fills the current paragraph.
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*** When Transient Mark mode is on, M-$ now checks spelling of the
region if the region is active.  Otherwise, it checks spelling of the
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word at point.

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*** When Transient Mark mode is on, TAB now indents the region if the
region is active.
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*** `use-empty-active-region' controls whether an empty active region
in Transient Mark mode should make commands operate on that empty
region.

** Temporarily active regions

*** The new variable shift-select-mode, non-nil by default, controls
shift-selection.  When Shift Select mode is on, shift-translated
motion keys (e.g. S-left and S-down) activate and extend a temporary
region, similar to mouse-selection.

*** Temporarily active regions, created using shift-selection or
mouse-selection, are not necessarily deactivated in the next command.
They are only deactivated after point motion commands that are not
shift-translated, or after commands that would ordinarily deactivate
the mark in Transient Mark mode (e.g., any command that modifies the
buffer).

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** C-M-% now shows replacement as it would look in the buffer, with
`\N' and `\&' substituted according to the match.  Old behavior can be
restored by customizing `query-replace-show-replacement'.
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** C-z now invokes `suspend-frame', C-x C-c now invokes
`save-buffers-kill-terminal'.

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** New command kill-matching-buffers kills buffers whose name matches a regexp.

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** You can disable kill ring commands from accessing the primary selection
by setting `x-select-enable-primary' to nil.

** If `select-active-regions' is t, setting the mark automatically
makes the new region into the primary selection (for interaction with
other window applications).  If you enable this, you might want to bind
`mouse-yank-primary' to Mouse-2.
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** If `yank-pop-change-selection' is t, rotating the kill ring
also updates the selection or clipboard to the current yank,
just as M-w would do so with the text it copies to the kill ring.

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** Minibuffer changes
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*** Minibuffer input of shell commands now comes with completion.

*** Operations like C-x b and C-x C-f which use switch-to-buffer do not fail
any more when used in a minibuffer or a dedicated window.  Instead, they
fallback on using pop-to-buffer which will use some other window.

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*** When M-n in the minibuffer reaches the end of the list of defaults,
it adds the completion list to the end, so next M-n continues putting
completion items to the minibuffer.  The same principle applies to
incremental search commands as well: C-s or C-M-s starts searching
the default values and after the end of defaults they continue
searching minibuffer completion items.
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*** In C-x d, if you type M-n you get the visited file name of the
current buffer.

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*** A list of default commands extracted from mailcap according to
file extensions are available in the list of default values
accessible by M-n in the minibuffer that reads a shell command
for M-!  (shell-command) and fills a list of commands for the current
file, and in Dired for ! (dired-do-shell-command) that fills a list of
commands for the intersection of file types of marked Dired files.
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*** A list of regexp default values is available via M-n for `occur',
`keep-lines', `flush-lines' and `how-many'.  This list includes the active
region in transient-mark-mode, the word under the cursor, the last isearch
regexp, the last isearch string and the last replacement regexp.

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*** isearch started in the minibuffer searches in the minibuffer history.
Reverse isearch commands (C-r, C-M-r) search in previous minibuffer
history elements, and forward isearch commands (C-s, C-M-s) search in
next history elements.  When the reverse search reaches the first history
element, it wraps to the last history element, and the forward search
wraps to the first history element.  When the search is terminated, the
history element containing the search string becomes the current.

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** New faces

*** `mode-line-emphasis' is used to highlight certain mode-line information;
for example while waiting for a VC command to finish.

** Face changes

*** The new function `face-all-attributes' returns an alist describing
all the basic attributes of a given face.

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*** FIXME face-remap

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* New Modes and Packages in Emacs 23.1
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** FIXME add details of new packages imported from lisp/gnus.
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[Maybe some information from doc/misc/gnus-coding.texi can be reused]
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** The package doc-view.el has been added.  It supports viewing of PDF,
PostScript and DVI documents inside an Emacs buffer by converting the
document to a set of PNG images first.  One can also search for a
regular expression in the document.  The commentary of the file explains
its usage.

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** The nXML package has been added.  It is a new mode for editing XML
documents.  nXML mode allows a schema to be associated with the XML
document being edited.  nXML mode uses Relax NG as its schema
language.  The schema is used to provide two key features:

*** Continuous validation.  nXML validates as you type, highlighting
any invalid parts of your document.

*** Completion.  nXML can assist you in entering an element name,
attribute name or data value by using information about what is
allowed by the schema in that context.
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** A new game called `bubbles' has been added.  This is a version of
the "Same Game" with configurable difficulty level.
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** minibuffer-indicate-depth-mode shows the minibuffer depth in the prompt.
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** Remember Mode (remember.el) is now included with Emacs.  It is a
mode for quickly jotting down things to remember.  Included with
remember.el is a backend that can save notes to a Diary file.  Please
consult the Remember Manual for usage details.

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** D-Bus language bindings for Elisp are provided by the package
dbus.el and by extensions to the C modules of Emacs.  D-Bus is an
inter-process communication mechanism for applications residing on the
same host, based on messages.  See the manual for further details.
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** zeroconf.el offers service discovery and service publishing
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interfaces according to the zeroconf specification.  It communicates
with Avahi, a zeroconf implementation, via D-Bus messages on systems
which have installed this software.
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** EasyPG is now part of the Emacs distribution.  It is an all-in-one
GnuPG interface which includes GnuPG keyring browser, cryptographic
operations on regions and files, and automatic encryption of *.gpg
files.  See the EasyPG Assistant User's Manual for further details.
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** json.el is now included with Emacs.  It is a library for parsing
and generating JSON (JavaScript Object Notation).  JSON is a
lightweight data-interchange format.

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** Auto Composition Mode is a minor mode that composes characters
automatically when they are displayed.  It is globally on by default.
It uses `auto-composition-function' (default `auto-compose-chars').

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** The package linum.el is now included with Emacs.  It it a new minor
mode to display line numbers for the current buffer.

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** proced.el has been added.  It operates on processes like dired.
Proced makes an Emacs buffer containing a listing of the current processes
(using ps(1)).  You can use the normal Emacs commands to move around in
this buffer, and special Proced commands to operate on the processes listed.

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** bug-reference.el provides clickable links to bug reports.

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* Changes in Specialized Modes and Packages in Emacs 23.1
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** Icomplete: `icomplete-prospects-height' supercedes `icomplete-prospects-length'.

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** A new `whitespace' package has been installed, and the pre-existing one
renamed to `old-whitespace'.
[FIXME someone explain why this is good, if it is...]

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** abbrev was rewritten in Elisp and extended with more flexibility.
*** New functions: abbrev-get, abbrev-put, abbrev-table-get, abbrev-table-put,
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    abbrev-table-p, abbrev-insert, abbrev-table-menu.
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*** Special hook `abbrev-expand-functions' obsoletes `pre-abbrev-expand-hook'.
*** `make-abbrev-table', `define-abbrev', `define-abbrev-table' all take
    extra arguments for arbitrary properties.
*** New variable `abbrev-minor-mode-table-alist'.
*** `local-abbrev-table' can hold a list of abbrev-tables.
*** Abbrevs have now the following special properties:
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    `:count', `:system', `:enable-function', `:case-fixed'.
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*** Abbrev-tables have now the following special properties:
    `:parents', `:case-fixed', `:enable-function', `:regexp',
    `abbrev-table-modiff'.

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** Help mode
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*** New macro `with-help-window' should set up help windows better
than `with-output-to-temp-buffer' with `print-help-return-message'.
*** New option `help-window-select' permits to customize whether help
window shall be automatically selected when invoking help.
*** New variable `help-window-point-marker' permits to specify new
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position of point in help window (for example in `view-lossage').
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** view-remove-frame-by-deleting is now by default t
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since users found iconification of view-mode frames distracting.
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** Isearch mode

*** New command `isearch-occur' bound to `M-s o' in isearch mode
runs `occur' with the current search string.

*** isearch can now search through multiple ChangeLog files.
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When running isearch in a ChangeLog file, if the search fails,
then another C-s tries searching the previous ChangeLog,
if there is one (e.g. go from ChangeLog to ChangeLog.12).

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This is enabled if isearch-buffers-multi is non-nil.

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*** The part of an isearch that failed to match is highlighted in `isearch-fail'
face.

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*** `C-h C-h' in isearch mode displays isearch-specific Help screen,
`C-h b' displays all isearch key bindings, `C-h k' displays the full
documentation of the given isearch key sequence, `C-h m' displays
documentation of isearch mode.  All the rest Help commands exit isearch mode
and execute their global definitions.

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** archive-mode has basic support to browse Rar archives.
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** talk.el has been extended for multiple tty support.

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** Compile and grep modes

*** The mode-line entry for the *compilation* and *grep* buffer is color coded.
It has different colors for to show that: (a) the command is still
running, (b) successful completion, (c) error.

*** compilation-auto-jump-to-first-error tells `compile' to jump to
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the first error encountered during compilations.

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** In the `copyright' package, you can specify your copyright holders' names.
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Only copyright lines with holders matching copyright-names-regexp will be
considered for update.

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** The `copyright' package looks for copyright at the end of the buffer
if `copyright-at-end-flag' is non-nil (change-log-mode sets this).

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** eldoc highlights the function argument under point
with the face `eldoc-highlight-function-argument'.

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** hide-ifdef-mode permits to shadow ifdef-blocks instead of hiding them.
See option `hide-ifdef-shadow' and function `hide-ifdef-toggle-shadowing'.

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+++
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** defcustom accepts new keyword arguments, `:safe' and `:risky', which
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set a variable's `safe-local-variable' and `risky-local-variable' property.

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** Etags changes
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*** The --members option is now the default.

Use --no-members if you want the old default behaviour of not tagging
struct members in C, members variables in C++ and variables in PHP.

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** VC
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*** VC now supports applying VC operations to a set of files at a time.
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This enables VC to work much more effectively with changeset-oriented
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version-control systems such as Subversion, GNU Arch, Mercurial, Git
and Bzr.  VC will now pass a multiple-file commit to these systems as
a single changeset.
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*** vc-dir is a new command that displays file names and their VC
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status.  It allows to apply various VC operations to a file or a
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set of files.

*** Clicking on the VC mode-line entry now pops the VC menu.

*** The VC mode-line entry now has a tooltip that explains the VC file status.

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*** In VC Annotate mode, for VC systems that support changesets, you can
see the diff for the whole changeset (not only for the current file)
by using the vc-annotate-show-changeset-diff-revision-at-line function.

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*** In VC Annotate mode, you can type V to toggle the annotation visibility.

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*** In VC Annotate mode, you can type f to show the file revision on
the current line.

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*** vc-git supports the "git grep" command.

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*** Asynchronous VC commands display [Waiting...] in the mode-line
of the corresponding buffer as long as the asynchronous process is
active.

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*** Log entries can be modified using the key "e" in log-view.
For now only CVS, RCS, SCCS and SVN support this functionality.
This is done by the `modify-change-comment' backend function.
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*** In log-view-mode, for VC systems that support changesets, you can
see the diff for the whole changeset (not only for the current file)
by typing the D key or using the "Changeset Diff" menu entry.

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*** VC Support for Meta-CVS has been removed for lack of maintainer able
to update it to the new VC.

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** smerge-refine highlights word-level details of changes in conflict.
It's used automatically as you move through conflicts, see smerge-auto-refine.

** Diff mode

*** diff-refine-hunk highlights word-level details of changes in a diff hunk.
It's used automatically as you move through hunks, see
diff-auto-refine.  It is bound to `C-c C-b'.

*** diff-add-change-log-entries-other-window iterates through the diff
buffer and tries to create ChangeLog entries for each change.
It is bound to `C-x 4 A'.

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** log-edit now has a command bound to C-c C-d to show the diff for
the files involved.

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** In Change Log mode, the new function `change-log-find-file', bound to
C-c C-f, finds the file associated with the current log entry.

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** sgml-electric-tag-pair-mode lets you simultaneously edit matched tag pairs.

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** The appearance of superscript and subscript in TeX is more customizable.
See the documentation of the variables: tex-fontify-script,
tex-font-script-display, tex-suscript-height-ratio, and
tex-suscript-height-minimum.

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** BibTeX mode
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*** New command `bibtex-initialize' (re)initializes BibTeX buffers.
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*** New `bibtex-entry-format' options `whitespace', `braces', and
`string', disabled by default.

*** New variable `bibtex-cite-matcher-alist' contains rules to
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identify cited keys in BibTeX entries, used by `bibtex-find-crossref'.
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*** Command `bibtex-url' allows multiple URLs per entry.
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** Tramp

*** New connection methods.
The new methods "plinkx", "plink2", "psftp", "sftp" and "fish" have
been introduced.  There are also new so-called gateway methods
"tunnel" and "socks".

*** Multihop syntax has been removed.
The pseudo-method "multi" has been removed.  Instead of, multi hops
can be specified by the new variable `tramp-default-proxies-alist'.

*** More default settings.
Default values can be set via the variables `tramp-default-user',
`tramp-default-user-alist' and `tramp-default-host'.

*** Connection information is cached.
In order to reduce connection setup, information about used
connections are kept persistent in a file.  The name of this file is
defined in the variable `tramp-persistency-file-name'.

*** Control of remote processes.
Running processes on a remote host can be controlled by settings in
`tramp-remote-path' and `tramp-remote-process-environment'.

*** Success of remote copy is checked.
When the variable `file-precious-flag' is set, the success of a remote
file copy is checked via the file's checksum.

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** Calendar and diary

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*** There is a new date style, `iso', essentially year/month/day.
The variable `european-calendar-style' is obsolete - use `calendar-date-style'.
Similarly, the commands `american-calendar' and `european-calendar'
should be replaced by `calendar-set-date-style'.

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*** The calendar namespace has been rationalized.
All functions and variables now begin with a `calendar-', `diary-', or
`holiday-' prefix.  The various calendar systems have secondary
prefixes, eg `calendar-french-'.  The old names you are likely to use
directly still exist, for the time being, as aliases, but please start
using the new names.

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*** The function `holiday-chinese' computes holidays on the Chinese calendar.
It has been used to add items to the list `holiday-oriental-holidays'.

*** `diary-remind' accepts a negative number -DAYS as a shorthand for
the list (1 2 ... DAYS).

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** Miscellaneous programming mode changes

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*** The file etc/emacs.py now supports both Python 2 and 3, meaning
that either version can be used as inferior Python by python.el.
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*** Python mode now has `pdbtrack' functionality.  When using pdb to
debug a Python program, pdbtrack notices the pdb prompt and displays
the source file and line that the program is stopped at, much the same
way as gud-mode does for debugging C programs with gdb.

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*** The variable `fortran-line-length' can change the fixed-form line-length.

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*** In Fortran mode, M-; is now bound to the standard comment-dwim,
rather than fortran-indent-comment.

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*** (The increasingly misnamed) F90 mode supports Fortran 2003 syntax.
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** Gnus package

*** The Gnus package has been updated

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*** In Emacs 23, Gnus uses Emacs' new internal coding system `utf-8-emacs' for
saving articles drafts and ~/.newsrc.eld.  These file may not be read
correctly in Emacs 22 and below.  If you want to Gnus across different Emacs
versions, you may set `mm-auto-save-coding-system' to `emacs-mule'.

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*** There are many news features, bug fixes and improvements.

See the file GNUS-NEWS or the node "No Gnus" in the Gnus manual for details.

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** Miscellaneous

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*** goto-address.el provides two new minor modes, goto-address-mode and
goto-address-prog-mode, which buttonize URLS and email addresses.

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*** comint-mode uses `start-file-process' now (see Lisp Changes).
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If `default-directory' is a remote file name, subprocesses are started
on the corresponding remote system.

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*** C-x C-q in dired-mode now runs the command wdired-change-to-wdired-mode,
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and C-x C-q in wdired-mode exits it with asking a question about
saving changes.
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*** The new command `eshell/info' runs info in an eshell buffer.

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*** The pcmpl-unix package supports hostname completion for ssh and scp.

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*** WoMan tries to add locale-specific manual page directories to the
search path.  This can be disabled by setting `woman-locale' to nil.

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*** The new variable `ffap-rfc-directories' specifies a list of local
directories in which `ffap-rfc' will first search for RFCs.

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*** net-utils has an `iwconfig' command, similar to the existing `ifconfig'.
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It is used to configure wireless interfaces.
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753 754

* Changes in Emacs 23.1 on non-free operating systems
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** Case is now considered significant in completion on MS-Windows.
The default value of `completion-ignore-case' is now nil on
MS-Windows, the same as it is for other operating systems.  The
variable doesn't apply to reading a file name -- in that case Emacs
heeds `read-file-name-completion-ignore-case' instead.

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---
** IPv6 is supported on MS-Windows.
Emacs now supports IPv6 on Windows XP and later, and earlier versions
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of Windows with third party IPv6 stacks installed.  In Emacs 22, IPv6 was
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supported on other platforms, but not on Windows due to using the winsock
1.1 header file, even though Emacs was linking to the winsock 2 library.

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---
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** Busy cursor (hourglass) now displays on MS-Windows.
When Emacs is busy, an hourglass mouse cursor is displayed on Windows.
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In Emacs 22 only X supported the busy cursor.

---
** Battery status is available on MS-Windows
Emacs can now display the battery status in the mode-line when enabled with
display-battery-mode or from the Options menu.  More verbose battery
information is also available with the command `battery'.  In Emacs 22
battery status was supported only on GNU/Linux and Mac.
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** More keys available on MS-Windows.
Keys normally associated with IMEs, and some exotic keys not normally found
on standard keyboards have been given names so they can be bound to functions
inside Emacs.  If there are keys on your keyboard that have not been exposed
to Emacs in the past, try C-h k to see if they are available now.

Emacs can now bind functions to the extra buttons for media player and
browser control present on some keyboards.  These buttons are disabled
by default, since enabling them prevents their system-wide use when
Emacs has focus.  To enable them, set the variable
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w32-pass-multimedia-buttons to nil.  See the doc string of that variable
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for the list of extra keys that are available.
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* Incompatible Lisp Changes in Emacs 23.1
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** Variables cannot be both buffer-local and frame-local any more.
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** The argument DEFAULT of minibuffer input functions `read-from-minibuffer',
`read-string', `completing-read', `read-buffer', `read-command',
`read-variable' now can be a list of default values.  The elements of
this list are available for inserting to the minibuffer with `M-n'.
If the user enters empty input, the first element is used as the default.

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** `functionp' returns nil for special forms.
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I.e., it only returns t for objects that can be passed to `funcall'.
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** The multibyteness of process filters is determined by the coding-system
used for decoding.  The functions `process-filter-multibyte-p' and
`set-process-filter-multibyte' are obsolete.

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** The behavior of map-char-table has changed.  It may call the
specified function with a cons (FROM . TO) as a key if characters in
that range have the same value.

** The value of the function `charset-id' is now always 0.

** The functions `register-char-codings' and `coding-system-spec'
have been removed.

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** The cpXXX coding systems are now supported automatically.  The
functions cp-...-codepage, which you had to use in Emacs 22 to enable
support for these coding systems, have been deleted.
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** The function `dired-call-process' has been removed.

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** The variable `byte-compile-warnings' can now be a list starting with `not',
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meaning to disable the specified warnings.  The meaning of this list
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may therefore be the reverse of what you expect (of course, this is
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only an issue if you make use of the new `not' syntax).  Rather than
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checking/manipulating elements directly, use the new functions
`byte-compile-warning-enabled-p', `byte-compile-disable-warning', and
`byte-compile-enable-warning.'

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** `mode-name' is no longer guaranteed to be a string.
Use `(format-mode-line mode-name)' to ensure a string value.

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** The following features have been removed.  They were used for
displaying various scripts with specific fonts, and are no longer
needed now that OpenType font support is available:

*** `devanagari' and `devan-util', and all associated devanagari-* and
dev-* functions and variables (formerly used for Devanagari script).

*** `kannada' and `knd-util', and all associated kannada-* and knd-*
functions and variables (formerly used for Kannada script).

*** `malayalam' and `mlm-util', and all associated malayalam-* and
mlm-* functions and variables (formerly used for Malayalam script).

*** `tamil' and `tml-util, and all associated tamil-* and tml-*
functions and variables (formerly used for Tamil script).
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855 856

* Lisp Changes in Emacs 23.1
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** The variable window-point-insertion-type determines the insertion-type
of the marker used for window-point.

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** minibuffer-local-must-match-filename-map is now named
minibuffer-local-filename-must-match-map.

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** `all-completions' may now return the base size in the last cdr.
Since this means the returned list is not properly nil-terminated, this
is an incompatible change and is thus enabled by the new variable
completion-all-completions-with-base-size.

** New function `apply-partially' for curried application.

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** `fill-forward-paragraph-function' specifies which function the filling
code should use to find paragraph boundaries.

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** The variable `this-command-keys-shift-translated' is non-nil if the
key sequence invoking the current command was found by
shift-translation.

** The new interactive spec code ^ says to first call
handle-shift-selection if shift-select-mode is non-nil, before reading
the command arguments.

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** When deleting a terminal, the special hook `delete-terminal-functions'
is run.
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** The `read-shell-command' function does what its name says, with completion.
It uses the minibuffer-local-shell-command-map for that.

** The `buffer-swap-text' function can swap the text between two buffers.
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This can be useful for modes such as tar-mode, archive-mode, RMAIL.

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** `clear-image-cache' can be told to flush only images of a specific file.

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** clone-indirect-buffer now runs the clone-indirect-buffer-hook.
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** `beginning-of-defun-function' now takes one argument, the count
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 given to `beginning-of-defun'.
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** The variable `inhibit-changing-match-data', if non-nil, prevents the
search and match primitives from changing the match data.

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** New function `match-substitute-replacement' returns the result of
`replace-match' without actually using it in the buffer.

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** The new variable `replace-search-function' determines the function
to use for searching in query-replace and replace-string.

** The new variable `replace-re-search-function' determines the
function to use for searching in `query-replace-regexp',
`replace-regexp', + `query-replace-regexp-eval', and
`map-query-replace-regexp'.

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** If a local hook function has a non-nil `permanent-local-hook'
property, then `kill-all-local-variables' does not remove it from
the local value of the hook variable.  This means it remains
even if you change major modes.

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** A list of default values can be specified for the DEFAULT argument of
functions `read-from-minibuffer', `read-string', `read-command',
`read-variable', `read-buffer', `completing-read'.  Elements of this list
are available for inserting into the minibuffer by typing `M-n'.
For empty input these functions return the first element of this list.

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** `custom-note-var-changed' tells Custom to treat the change in a certain
variable as having been made within Custom.

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** `frame-inherited-parameters' lets new frames inherit parameters from
the selected frame.
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** Commands should use `use-region-p' to test whether there is
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an active region that they should operate on.

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** `region-active-p' returns non-nil when Transient Mark mode
is enabled and there is an active region.  This is NOT the best function
to use to test whether a command should operate on the region instead
of the usual behavior -- for that, use `use-region-p'.

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** If a command sets `transient-mark-mode' to (only . OLDVAL), that
means to activate transient-mark-mode temporarily, until the next
unshifted point motion command or mark deactivation.  Afterwards,
reset transient-mark-mode to the value OLDVAL.  The values `only' and
`identity', introduced in Emacs 22, are now deprecated.

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** New keymap `input-decode-map' overrides like key-translation-map, but
applies before function-key-map.  Also it is terminal-local contrary to
key-translation-map.  Terminal-specific key-sequences are generally added to
this map rather than to function-key-map now.

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** The new macro `declare-function' suppresses compiler warnings about
undefined functions.  The new `check-declare' package verifies that such
statements are accurate (i.e. the functions are actually defined in
the specified files).

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** `ignore-errors' is now a standard macro (does not require the CL package).

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** The new function `read-color' reads a color name using the minibuffer.

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** `interprogram-paste-function' can now return one string or a list
of strings.  In the latter case, Emacs puts the second and following
strings on the kill ring.

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** Character code, representation, and charset changes.

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The character code space is now 0x0..0x3FFFFF with no gap.
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Characters of code 0x0..0x10FFFF are Unicode characters of the same code points.
Characters of code 0x3FFF80..0x3FFFFF are raw 8-bit bytes.

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Generic characters no longer exist.
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In buffer and string, characters are represented by UTF-8 byte
sequence in a multibyte buffer/string.

The concept of a charset has changed.  A single character may belong to
multiple charsets (e.g. a-grave, U+00E0, belongs to charsets unicode,
iso-8859-1, iso-8859-3, etc).

*** The new function `characterp' returns t if and only if the argument
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is a character.  This replaces `char-valid-p', which is now obsolete.
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*** The new function `max-char' returns the maximum character code
(currently it is #x3FFFFF).

*** The functions `encode-char' and `decode-char' now accept any character sets.

*** The function `define-charset' now accepts a completely different
form of arguments (old-style arguments still work).

*** The new function `define-charset-alias' defines an alias of a charset.

*** The value of the function `char-charset' depends on the current
priorities of charsets.

*** The new function `charset-priority-list' returns the list of
charsets ordered by priority.

*** The new function `set-charset-priority' sets priorities of charsets.

*** The new function `unibyte-string' make a unibyte string from bytes.

*** The new function `define-char-code-property' defines a character
code property.

*** The new function `char-code-property-description' returns the
description string of a character code property.

*** The function get-char-code-property now accepts many Unicode base
character properties.  They are `name', `general-category',
`canonical-combining-class', `bidi-class', `decomposition',
`decimal-digit-value', `digit-value', `numeric-value', `mirrored',
`old-name', `iso-10646-comment', `uppercase', `lowercase', and
`titlecase'.

*** The new variable `find-word-boundary-function-table' is a
char-table of functions to search for a word boundary.

*** The new variable `char-script-table' is a char-table of script names.

*** The new variable `char-width-table' is a char-table of character widths.

*** The new variable `print-charset-text-property' controls how to
handle `charset' text property on printing a string.

*** The new variable `printable-chars' is a char-table defining if a
character is printable or not.

*** The functions `modify-syntax-entry' and `modify-category-entry' now
accepts a cons of characters as the first argument, and modify all
entries in that range of characters.
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*** `translation-table-for-input' is now obsolete.
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** Code conversion changes
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*** The new function `define-coding-system' should be used to define a
coding system instead of `make-coding-system' (which is now obsolete).

*** The functions `encode-coding-region' and `decode-coding-region'
have an optional 4th argument to specify where the result of
conversion should go.

*** The functions `encode-coding-string' and `decode-coding-string'
have an optional 4th argument specifying a buffer to store the result
of conversion.

*** The new function `with-coding-priority' executes the body part with
the specified coding system priority order.

*** The new function `check-coding-systems-region' checks if the text
in the region is encodable by the specified coding systems.

*** The new function `coding-system-aliases' returns a list of aliases
of a coding system.

*** The new function `coding-system-charset-list' returns a list of
charsets supported by a coding system.

*** The new function `coding-system-priority-list' returns a list of
coding systems ordered by their priorities.

*** The new function `set-coding-system-priority' sets priorities of
coding systems.

*** The functions `set-coding-priority' and `make-coding-system' are obsolete.

** There is a new input method, Robin, different from Quail.
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It has three functionalities:
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 i) a simple input method (converts an ASCII sequence into a string).
ii) converts an existing buffer substring into another string
iii) reverse conversion (each character produced by a
robin rule can hold the original ASCII sequence as a char-code-property)

*** The new function `robin-define-package' defines a Robin package.

*** The new function `robin-modify-package' modifies an existing Robin package.

*** The new function `robin-use-package' starts using a Robin package
as an input method.

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** Changes related to the new font backend
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Which font backends to use can be specified by the X resource "FontBackend".
For instance, to use both X core fonts and Xft fonts:
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Emacs.FontBackend: x,xft
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If this resource is not set, Emacs tries to use all font backends
available on your graphic device.
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*** New frame parameter `font-backend' specifies a list of
font-backends supported by the frame's graphic device.  On X, they are
currently `x' and `xft'.

*** New function `fontp' checks if the argument is a font-spec or font-entity.

*** New function `font-spec' creates a new font-spec object.

*** New function `font-get' returns a font property value.

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*** New function `font-face-attributes' returns a plist of face
attributes set by a font.

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*** New function `font-put' sets a font property value.

*** New function `list-fonts' returns a list of font-entities matching
the given specification.

*** New function `list-families' returns a list of family names of
available fonts.

*** New function `font-font' returns a font-entity best matching with
the given specification.

*** New function `font-xlfd-name' returns an XLFD name of a given font
(font-spec, font-entity, or font-object).

*** New function `clear-font-cache' clears all font caches.

*** The function `set-fontset-font' now accepts a script name as the
second argument, and has an optional 5th argument to control how to
set the font.

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** Changes related to multiple tty support
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*** $TERM is now set to `dumb' for subprocesses.  If you want to know the
$TERM inherited by Emacs you will have to look inside initial-environment.

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*** $DISPLAY is now dynamically inherited from the frame's `display'.

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*** The `window-system' variable has been made frame-local.  The new
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`initial-window-system' variable contains the `window-system' value
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for the first frame.  `window-system' is also now a function that
takes a frame argument.
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*** You can specify a terminal device (`tty' parameter) and a terminal
type (`tty-type' parameter) to `make-terminal-frame'.

*** The new function `make-frame-on-tty' allows you to create a new
frame on another tty device interactively.

*** The function `make-frame-on-display' now works during a tty
session, and `make-frame-on-tty' works during a graphical session.

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*** New functions: `delete-tty', `suspend-tty', `resume-tty'.
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*** A new data type for terminals with functions: `get-device-terminal',
`terminal-parameters', `terminal-parameter', `set-terminal-parameter'.
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*** New hooks: `suspend-tty-functions' and `resume-tty-functions'
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are called after a tty frame has been suspended or resumed,
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respectively.  The functions are called with the terminal id of the frame
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