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GNU Emacs NEWS -- history of user-visible changes.
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Copyright (C) 2010-2012 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 bug-gnu-emacs@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 24.
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See files NEWS.23, 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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* Installation Changes in Emacs 24.3
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** New configure option '--without-all' to disable additional features.
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This disables most of the features that are normally enabled by default.

** New configure option '--enable-link-time-optimization' to utilize
an appropriate feature provided by GCC since version 4.5.0.

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** New configure option '--enable-gcc-warnings', intended for developers.
If building with GCC, this enables compile-time checks that warn about
possibly-questionable C code.  On a recent GNU system there should be
no warnings; on older and on non-GNU systems the generated warnings
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may be useful.
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** The configure option '--disable-maintainer-mode' has been removed,
as it was confusingly-named and rarely useful.

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---
** You can use `NO_BIN_LINK=t make install' to prevent the installation
overwriting "emacs" in the installation bin/ directory with a link
to emacs-VERSION.

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---
** Emacs uses libtinfo in preference to libncurses, if available.

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---
** On FreeBSD and NetBSD, configure no longer adds /usr/local/lib and
/usr/pkg/lib to the linker search path.  You must add them yourself if
you want them.

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---
** On Mac OS X, configure no longer automatically adds the Fink /sw
directories to the search path.  You must add them yourself if you want them.

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---
** The standalone scripts rcs-checkin and vcdiff have been removed
(from the bin and libexec directories, respectively).  The former is
no longer relevant, the latter is replaced by lisp (in vc-sccs.el).

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** The configuration option '--enable-use-lisp-union-type' has been
renamed to '--enable-check-lisp-object-type', as the resulting
Lisp_Object type no longer uses a union to implement the compile time
check that this option enables.

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---
** The default toolkit has been changed to Gtk+ version 3.
If you don't pass --with-x-toolkit to configure or if you pass
--with-x-toolkit=gtk or --with-x-toolkit=yes, configure will try to build
with Gtk+ version 3, and if that fails, try Gtk+ version 2.
You can explicitly require a specific version by passing
--with-x-toolkit=gtk2 or --with-x-toolkit=gtk3 to configure.

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* Startup Changes in Emacs 24.3
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** Emacs no longer searches for `leim-list.el' files beneath the standard
lisp/ directory.  There should not be any there anyway.  If you have
been adding them there, put them somewhere else, eg site-lisp.

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---
** The `--no-site-lisp' command line option now works for Nextstep builds.

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* Changes in Emacs 24.3
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** You can now scroll the selected window in most y-or-n prompts.
Typing C-v or M-v at a prompt scrolls forward or backward
respectively, without leaving the y-or-n prompt.

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** Help changes

*** `C-h f' (describe-function) can now perform autoloading.
When this command is called for an autoloaded function whose docstring
contains a key substitution construct, that function's library is
automatically loaded, so that the documentation can be shown
correctly.  To disable this, set `help-enable-auto-load' to nil.

*** `C-h f' now reports previously-autoloaded functions as "autoloaded",
even after their associated libraries have been loaded (and the
autoloads have been redefined as functions).

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** The function `current-time' now returns extended-format time stamps
(HIGH LOW USEC PSEC) that use picosecond resolution; the PSEC
component is new.  PSEC is typically a multiple of 1000 on current
machines.  Other functions that use this format, such as
file-attributes and format-time-string, have been changed accordingly.
Old-format time stamps are still accepted.

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** The format of timers in timer-list and timer-idle-list is now
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[TRIGGERED-P HI-SECS LO-SECS USECS REPEAT-DELAY FUNCTION ARGS IDLE-DELAY PSECS].
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The PSECS slot is new, and uses picosecond resolution.  It can be
accessed via the new timer--psecs accessor.

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** Emacs now generates backtraces on fatal errors.
On encountering a fatal error, Emacs now outputs a textual description
of the fatal signal, and a short backtrace on platforms like glibc
that support backtraces.

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** New functions `system-users', `system-groups' return lists of the user
name, group names known to the system (where possible).

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** If your Emacs was built from a bzr checkout, the new variable
`emacs-bzr-version' contains information about which bzr revision was used.

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** ImageMagick support, if available, is automatically enabled.
It is no longer necessary to call `imagemagick-register-types'
explicitly to install ImageMagick image types; that function is called
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automatically at startup, or when customizing a relevant imagemagick-
option.
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*** Setting `imagemagick-types-inhibit' to t now disables the use of
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ImageMagick to view images.  You must call imagemagick-register-types
afterwards if you do not use customize to change this.
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*** The new variable `imagemagick-enabled-types' also affects which
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ImageMagick types are treated as images.  The function
`imagemagick-filter-types' returns the list of types that will be
treated as images.
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*** Images displayed via ImageMagick now support transparency and the
:background image spec property.
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** Internationalization changes

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*** New language environment: Persian.
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** Face underlining can now use a wave.
See the "Face Attributes" section of the Elisp manual.

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** New fringe bitmap exclamation-mark.

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** String values for `initial-buffer-choice' also apply to emacsclient
frames, if emacsclient is only told to open a new frame without
specifying any file to visit or expression to evaluate.

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+++
** You can prevent the creation of lock files by setting `create-lockfiles'
to nil.  Use with caution, and only if you really need to.

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+++
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** Using "unibyte: t" in Lisp source files is obsolete.
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Use "coding: raw-text" instead.
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** Mode line changes

*** New option `mode-line-default-help-echo' specifies the help text
(shown in a tooltip or in the echo area) for any part of the mode line
that does not have its own specialized help text.

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*** You can now click mouse-3 in the coding system indicator to
invokes `set-buffer-file-coding-system'.

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+++
** Setting `enable-remote-dir-locals' to non-nil allows directory
local variables on remote hosts.

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+++
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** `insert-char' is now a command, and `ucs-insert' an obsolete alias
for it.

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** The entry for PCL-CVS has been removed from the Tools menu.
The PCL-CVS commands are still available via the keyboard.

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* Editing Changes in Emacs 24.3
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** The `z' key no longer has a binding in most special modes.
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It used to be bound to `kill-this-buffer', but `z' is too easy to
accidentally type.
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** New option `yank-handled-properties' allows processing of text
properties on yanked text, in more ways that are more general than
just removing them, as done by `yank-excluded-properties'.

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** New option `delete-trailing-lines' specifies whether the M-x
delete-trailing-whitespace command should delete trailing lines at the
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end of the buffer.  It defaults to t.

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+++
** `C-x r +' is now overloaded to invoke `append-to-register.
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** New option `register-separator' specifies the register containing
the text to put between collected texts for use with M-x
append-to-register and M-x prepend-to-register.
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** Search changes

*** Global `M-s _' starts a symbol (identifier) incremental search,
and `M-s _' in Isearch toggles symbol search mode.
`M-s c' in Isearch toggles search case-sensitivity.

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*** `M-s SPC' in Isearch toggles whitespace matching mode
in both ordinary and regexp incremental search, so that each
sequence of spaces in the search string matches any combination
of one or more whitespace characters defined by the variable
`search-whitespace-regexp'.  In ordinary incremental search,
`isearch-toggle-lax-whitespace' toggles the value of the variable
`isearch-lax-whitespace'.  In regexp incremental search, it toggles
the value of the variable `isearch-regexp-lax-whitespace'.
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** query-replace changes

*** When new option `replace-lax-whitespace' is non-nil,
and you enter a space or spaces in the strings or regexps
to be replaced, `query-replace' will match any sequence matched
by the regexp `search-whitespace-regexp'.

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** M-x move-to-column, if called interactively with no prefix arg, now
prompts for a column number.

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** `mouse-avoidance-banish-position' can now be used to customize
`mouse-avoidance-mode' further.

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** `C-u M-=' now counts lines/words/characters in the entire buffer.
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** `C-M-f' and `C-M-b' will now move to the path name separator
character when doing minibuffer filename prompts.

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** `goto-char' is now bound to `M-g c'.

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** New command `C-x r M-w' (copy-rectangle-as-kill).
It copies the region-rectangle as the last rectangle kill.

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** New input method `vietnamese-vni'.

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* Changes in Specialized Modes and Packages in Emacs 24.3
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** Compilation has a new `compilation-always-kill' configuration variable.

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** Term changes

The variables `term-default-fg-color' and `term-default-bg-color' are
now deprecated in favor of the `term-face' face, that you can
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customize.  Also, it is now possible to customize how are displayed the
ANSI terminal colors and styles by customizing the corresponding
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`term-color-<COLOR>', `term-color-underline' and `term-color-bold'
faces.

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** CL
*** CL's main entry is now (require 'cl-lib).
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`cl-lib' is like the old `cl' except that it uses the namespace cleanly,
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i.e. all its definitions have the "cl-" prefix (and internal definitions use
the "cl--" prefix).
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If `cl' provided a feature under the name `foo', then `cl-lib' provides it
under the name `cl-foo' instead, with the exceptions of the few definitions
that had to use `foo*' to avoid conflicts with pre-existing Elisp entities,
which have not been renamed to `cl-foo*' but just `cl-foo'.

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The old `cl' is now deprecated and is just a bunch of aliases that
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provide the old non-prefixed names.

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*** `cl-flet' is not like `flet' (which is deprecated).
Instead it obeys the behavior of Common-Lisp's `flet'.

*** `cl-labels' is slightly different from `labels'.
The difference is that it relies on the `lexical-binding' machinery (as opposed
to the `lexical-let' machinery used previously) to capture definitions in
closures, so such closures will only work if `lexical-binding' is in use.

*** `progv' was rewritten to use the `let' machinery.
A side effect is that vars without corresponding value are bound to nil
rather than making them unbound.

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** Desktop

*** `desktop-path' no longer includes the "." directory.  Desktop
files are now located in ~/.emacs.d by default.

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** Python mode

A new version of python.el, which provides several new features, including:
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per-buffer shells, better indentation, Python 3 support, and improved
shell-interaction compatible with iPython (and virtually any other
text based shell).

*** Some user options have been replaced/renamed:
Old defcustom:                | New defcustom:
python-indent                 | python-indent-offset
python-guess-indent           | python-indent-guess-indent-offset
python-pdbtrack-do-tracking-p | python-pdbtrack-activate
python-use-skeletons          | python-skeleton-autoinsert

*** Some user options have been removed:

**** `python-indent-string-contents': Strings are never indented.

**** `python-honour-comment-indentation':
Comments are never considered as indentation markers themselves.

**** `python-continuation-offset': Indentation is automatically
calculated in a pep8 compliant way depending on the context.

**** `python-shell-prompt-alist', `python-shell-continuation-prompt-alist':
Have no direct mapping as the shell interaction is completely different.

**** `python-python-command', `python-jython-command':
Replaced by `python-shell-interpreter'.

**** `inferior-python-filter-regexp', `python-remove-cwd-from-path',
`python-pdbtrack-minor-mode-string', `python-source-modes':
No longer relevant.

*** Some commands have been replaced:
Old command               | New command
python-insert-class       | python-skeleton-class
python-insert-def         | python-skeleton-def
python-insert-for         | python-skeleton-for
python-insert-if          | python-skeleton-if
python-insert-try/except  | python-skeleton-try
python-insert-try/finally | python-skeleton-try
python-insert-while       | python-skeleton-while
python-find-function      | python-nav-jump-to-defun
python-next-statement     | python-nav-forward-sentence
python-previous-statement | python-nav-backward-sentence
python-send-buffer        | python-shell-send-buffer
python-send-defun         | python-shell-send-defun
python-send-region        | python-shell-send-region
python-send-region-and-go | Emulate with python-shell-send-region and
                            python-shell-switch-to-shell
python-send-string        | python-shell-send-string
python-switch-to-python   | python-shell-switch-to-shell
python-describe-symbol    | python-eldoc-at-point

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** VHDL mode

*** The free software compiler GHDL is supported (and now the default).

*** Support for the VHDL-AMS packages has been added/updated.

*** Updated to the 2002 revision of the VHDL standard.

*** Accepts \r and \f as whitespace.
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** SQL Mode

*** DB2 added `sql-db2-escape-newlines'

If non-nil, newlines sent to the command interpreter will be escaped
by a backslash.  The default does not escape the newlines and assumes
that the sql statement will be terminated by a semicolon.

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** Diff mode

Faces for changes now use the same diff color scheme as in modern VCSes
where deletions are displayed in red (new faces `diff-refine-removed'
and `smerge-refined-removed' and new definition of `diff-removed'),
insertions in green (new faces `diff-refine-added' and
`smerge-refined-added' and new definition of `diff-added').
The variable `diff-use-changed-face' defines whether to use
the face `diff-changed', or `diff-removed' and `diff-added'
to highlight changes in context diffs.

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*** The new command `diff-remove-trailing-whitespace' fixes trailing
whitespace problems introduced by the diff.

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** Ediff now uses the same color scheme as Diff mode
on high color displays.

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** Flymake uses fringe bitmaps to indicate errors and warnings.
See flymake-fringe-indicator-position, flymake-error-bitmap and
flymake-warning-bitmap.

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** `sh-script'
*** Pairing of parens/quotes uses electric-pair-mode instead of skeleton-pair.
*** `sh-electric-here-document-mode' now controls auto-insertion of here-docs.
*** `sh-use-smie' lets you choose a new indentation and navigation code.

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** reStructuredText mode

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*** Rebind nearly all keys making room for more keys and complying
better to usage in other modes.  Describe bindings with C-c C-h.
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*** Major revision of indentation working very similar to other
modes.  TAB is your friend.
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*** Major revision of filling working fine with most of
reStructuredText syntax.  Support auto-filling.
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*** Major revision of comment handling.

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*** Major revision of fontification working with `jit-lock-mode'.
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*** Cover reStructuredText syntax more closely.  Improve
the experience for Sphinx users.
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*** `rst-insert-list' inserts new list or continues existing lists.
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*** Extend correct and improve customization.
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*** Negative prefix argument always works for `rst-adjust'.

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*** Reset window configuration after displaying TOC.
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*** Package version in `rst-version'.
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*** Support `imenu' and `which-func'.

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** New `derived-mode' filter for Ibuffer, bound to `/ M'.
`/ m' is now bound to filter by used-mode, which used to be bound to `/ M'.
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** Apropos

*** The faces used by Apropos are now directly customizable.
These faces are named `apropos-symbol', `apropos-keybinding', and so on;
see the `apropos' Custom group for details.

**** The old options whose values specified faces to use were removed
(i.e. `apropos-symbol-face', `apropos-keybinding-face', etc.).

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** Buffer Menu
This package has been rewritten to use Tabulated List mode.

*** Option `Buffer-menu-buffer+size-width' is now obsolete.
Use `Buffer-menu-name-width' and `Buffer-menu-size-width' instead.

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** Calendar

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*** You can customize the header text that appears above each calendar month.
See the variable `calendar-month-header'.

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*** The calendars produced by cal-html include holidays.
Customize cal-html-holidays to change this.
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** Customize

*** `custom-reset-button-menu' now defaults to t.
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*** Non-option variables are never matched in `customize-apropos' and
`customize-apropos-options' (i.e. the prefix argument does nothing for
these commands now).

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** erc will look up server/channel names via auth-source and use the
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channel keys found, if any.
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** Dired

*** `dired-do-async-shell-command' executes each file sequentially
if the command ends in `;' (when operating on multiple files).
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Otherwise, it executes the command on each file in parallel.
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*** Typing M-n in the minibuffer of `dired-do-chmod', `dired-do-chgrp',
`dired-do-chown', `dired-do-touch' pulls the file attributes of the
file at point.

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*** When the region is active, `m' (`dired-mark'), `u' (`dired-unmark'),
`DEL' (`dired-unmark-backward'), `d' (`dired-flag-file-deletion')
mark/unmark/flag all files in the active region.

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*** The minibuffer default for `=' (`dired-diff) has changed.
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It is now the backup file for the file at point, if one exists.
In Transient Mark mode the default is the file at the active mark.
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*** `M-=' is no longer bound to `dired-backup-diff' in Dired buffers.
The global binding for `M-=', `count-words-region' is in effect.

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** Shell

*** New option `async-shell-command-buffer' specifies what buffer to use
for a new asynchronous shell command when the default output buffer
`*Async Shell Command*' is already taken by another running command.

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** FFAP

*** The option `ffap-url-unwrap-remote' can now be a list of strings,
specifying URL types which should be converted to remote file names at
the FFAP prompt.  The default is now '("ftp").

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** Follow mode

*** The obsolete variable `follow-mode-off-hook' has been removed.

*** Follow mode no longer works by using advice.
The option `follow-intercept-processes' has been removed.

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** The `server-auth-key' variable can be used to set a permanent
shared key for Emacs Server.
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** In Perl mode, new option `perl-indent-parens-as-block' causes non-block
closing brackets to be aligned with the line of the opening bracket.

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** FIXME something happened to ses.el, 2012-04-17.

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** which-function-mode now applies to all applicable major modes by default.

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** Tramp

+++
*** The syntax has been extended in order to allow ad-hoc proxy
definitions.  See the manual for details.

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*** Remote processes are now supported also on remote Windows host.

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** D-Bus

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*** New variables `dbus-compiled-version' and `dbus-runtime-version'.

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*** The D-Bus object manager interface is implemented.

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*** Variables of type :(u)int32 and :(u)int64 accept floating points,
if their value does not fit into Emacs's integer range.

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*** The function `dbus-call-method' works non-blocking now, it can be
interrupted by C-g.  `dbus-call-method-non-blocking' is obsolete.

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*** Signals can be sent also as unicast message.

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*** The argument list of `dbus-register-signal' has been extended,
according to the new match rule types of D-Bus.  See the manual for
details.

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*** `dbus-init-bus' supports private connections.

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*** There is a new function `dbus-setenv'.

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+++
** notifications.el supports now version 1.2 of the Notifications API.
The function `notifications-get-capabilities' returns the supported
server properties.

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** Package Menu

*** Newly-available packages are listed in the Package Menu as "new",
and sorted above the other "available" packages by default.

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** Tabulated List and packages derived from it

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*** New command `tabulated-list-sort', bound to `S', sorts the column
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at point, or the Nth column if a numeric prefix argument is given.

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** URL

*** Structs made by `url-generic-parse-url' have nil `attributes' slot.
Previously, this slot stored semicolon-separated attribute-value pairs
appended to some imap URLs, but this is not compatible with RFC 3986.
So now the `filename' slot stores the entire path and query components
and the `attributes' slot is always nil.

*** New function `url-encode-url' for encoding a URI string.
The `url-retrieve' function now uses this to encode its URL argument,
in case that is not properly encoded.

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** Obsolete packages:

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*** assoc.el
In most cases, assoc+member+push+delq work just as well.
And in any case it's just a terrible package: ugly semantics, terrible
inefficiency, and not namespace-clean.

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*** bruce.el

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*** ledit.el

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*** mailpost.el
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*** mouse-sel.el

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*** patcomp.el

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*** cust-print.el

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* New Modes and Packages in Emacs 24.3
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* Incompatible Lisp Changes in Emacs 24.3
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** (random) by default now returns a different random sequence in
every Emacs run.  Use (random S), where S is a string, to set the
random seed to a value based on S, in order to get a repeatable
sequence in later calls.

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** The function `x-select-font' can return a font spec, instead of a
font name as a string.  Whether it returns a font spec or a font name
depends on the graphical library.

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** If the NEWTEXT arg to `replace-match' contains a substring "\?",
that substring is inserted literally even if the LITERAL arg is
non-nil, instead of causing an error to be signaled.

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+++
** Docstrings starting with `*' no longer indicate user options.
Only variables defined using `defcustom' are considered user options.
The function `user-variable-p' is now an obsolete alias for
`custom-variable-p'.

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+++
** The return values of `defalias', `defun' and `defmacro' have changed,
and are now undefined.  For backwards compatibility, defun and
defmacro currently return the name of the newly defined function/macro
but this should not be relied upon.

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** `face-spec-set' no longer sets frame-specific attributes when the
third argument is a frame (that usage was obsolete since Emacs 22.2).

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+++
** The arguments of `dbus-register-signal' are no longer just strings,
but keywords or keyword-string pairs.  The old argument list will
still be supported for Emacs 24.x.

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** Spelling changes.
Some Lisp symbols have been renamed to avoid problems with spelling
that is incorrect or inconsistent with how Emacs normally spells a word.

*** Renamed functions

**** hangul-input-method-inactivate -> hangul-input-method-deactivate
**** inactivate-input-method -> deactivate-input-method
**** quail-inactivate -> quail-deactivate
**** robin-inactivate -> robin-deactivate
**** viper-inactivate-input-method -> viper-deactivate-input-method
**** viper-inactivate-input-method-action ->
     viper-deactivate-input-method-action
**** ucs-input-inactivate -> ucs-input-deactivate

*** Renamed hooks
The old hooks are still supported for backward compatibility, but they
are deprecated and will be removed eventually.

**** input-method-inactivate-hook -> input-method-deactivate-hook
**** robin-inactivate-hook -> robin-deactivate-hook
**** quail-inactivate-hook -> quail-deactivate-hook

*** Renamed Lisp variables

**** follow-deactive-menu -> follow-inactive-menu
**** inactivate-current-input-method-function ->
     deactivate-current-input-method-function

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** The following obsolete variables and varaliases have been removed:

*** `facemenu-unlisted-faces'
*** `rmail-decode-mime-charset'
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*** `last-input-char', `last-command-char', `unread-command-char'.
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* Lisp changes in Emacs 24.3
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** Interpreted files get eagerly macro-expanded during load.
This can significantly speed up execution of non-byte-compiled code, but can
also bump into harmless and previously unnoticed cyclic dependencies.
These should not be fatal: they will simply cause the macro-calls to be left
for later expansion (as before), but will also result in a warning describing
the cycle.

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** New minor mode `read-only-mode' to replace toggle-read-only (now obsolete).

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** New functions `autoloadp' and `autoload-do-load'.

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** New function `posnp' to test if an object is a `posn'.

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** `function-get' fetches the property of a function, following aliases.

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** `toggle-read-only' accepts a second argument specifying whether to
print a message, if called from Lisp.

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** CL-style generalized variables are now in core Elisp.
`setf' is autoloaded and `push' and `pop' accept generalized variables.

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** `defun' also accepts a (declare DECLS) form, like `defmacro'.
The interpretation of the DECLS is determined by `defun-declarations-alist'.

** `macro-declaration-function' is obsolete, use `macro-declarations-alist'.

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** New function `set-temporary-overlay-map'.

** New macros `setq-local' and `defvar-local'.

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** New error type and new function `user-error'.  Doesn't trigger the debugger.
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** Debugger
*** New option `debugger-bury-or-kill'.

*** Set `debug-on-message' to enter the debugger when a certain
message is displayed in the echo area.  This can be useful when trying
to work out which code is doing something.

*** New var `inhibit-debugger', automatically set to prevent accidental
recursive invocations.
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+++
** New utility function `buffer-narrowed-p'.

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** Window changes

*** The functions get-lru-window, get-mru-window and get-largest-window
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now accept a third argument to avoid choosing the selected window.
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*** Additional values recognized for option `window-combination-limit'.

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*** New macro `with-temp-buffer-window'.

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*** New options `temp-buffer-resize-frames' and
`temp-buffer-resize-regexps'.

*** `temp-buffer-resize-mode' no longer resizes windows that have been
reused.
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*** New function `fit-frame-to-buffer' and new option
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`fit-frame-to-buffer-bottom-margin'.
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*** New display action functions `display-buffer-below-selected',
`display-buffer-at-bottom' and `display-buffer-in-previous-window'.
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*** New display action alist entry `inhibit-switch-frame', if non-nil,
tells display action functions to avoid changing which frame is
selected.
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*** New display action alist entry `pop-up-frame-parameters', if
non-nil, specifies frame parameters to give any newly-created frame.
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*** New display action alist entry `previous-window', if non-nil,
specifies window to reuse in `display-buffer-in-previous-window'.
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*** The following variables are obsolete, as they can be replaced by
appropriate entries in the `display-buffer-alist' function introduced
in Emacs 24.1:
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**** `display-buffer-reuse-frames'
**** `special-display-regexps'
**** `special-display-frame-alist'
**** `special-display-buffer-names'
**** `special-display-function'
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**** `display-buffer-function'
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** Minibuffer

*** `read-regexp' has a new argument HISTORY; the first argument PROMPT
of `read-regexp' accepts a string ending with a colon and space, and its
second argument DEFAULTS can be a list of strings accessible via M-n
in the minibuffer ahead of other hard-coded useful regexp-related values.
More commands use `read-regexp' now to read their regexp arguments.

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** Completion

*** New function `completion-table-with-quoting' to handle completion
in the presence of quoting, such as file completion in shell buffers.

*** New function `completion-table-subvert' to use an existing completion
table, but with a different prefix.
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** Time

*** `current-time-string' no longer requires that its argument's year
must be in the range 1000..9999.  It now works with any year supported
by the underlying C implementation.
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** Floating point

*** When floating point functions such as `log' are given invalid
arguments, e.g., (log -1.0), they now uniformly return special values
such as NaNs instead of signaling errors.  Previously, these functions
returned NaNs on some platforms but signaled errors on others.  The affected
functions are acos, asin, tan, exp, expt, log, log10, sqrt, and mod.

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** New function file-name-base.

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** New function `tty-top-frame' returns the topmost frame of a text terminal.

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** `automount-dir-prefix' is obsolete.
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** `buffer-has-markers-at' is obsolete.
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** `window-system-version' is obsolete.
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* Changes in Emacs 24.3 on non-free operating systems
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** New configure.bat options on MS-Windows:

*** --without-libxml2 omits support for libxml2, even if its presence
is detected.

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** When invoked with the -nw switch to run on the Windows text-mode terminal,
Emacs now supports mouse highlight, help-echo (in the echo area), and
mouse-autoselect-window.

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** On MS-Windows Vista and later Emacs now supports symbolic links.
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* Changes in Emacs 24.2

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** This is mainly a bug-fix release.
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814

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* Installation Changes in Emacs 24.1
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** 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.
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** 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.
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** 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.
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** 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.
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This feature is not available for the Nextstep or MS ports.
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** 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.

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

** New configure option --with-wide-int.
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With it, Emacs integers typically have 62 bits, even on 32-bit machines.
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On 32-bit hosts, this raises the limit on buffer sizes from about 512 MiB
to about 2 GiB.
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** New configure options: --with-mmdf, --with-mail-unlink, --with-mailhost.
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These provide no new functionality, they just remove the need to edit
lib-src/Makefile by hand in order to use the associated features.

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** New configure option --enable-use-lisp-union-type.
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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.
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** 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.

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* Startup Changes in Emacs 24.1
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** The --unibyte, --multibyte, --no-multibyte, and --no-unibyte
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command line arguments, and the EMACS_UNIBYTE environment variable, no
longer have any effect.  (They were declared obsolete in Emacs 23.)
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** New command line option `--no-site-lisp' removes site-lisp directories
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from load-path.  -Q now implies this.  This option does not affect the
EMACSLOADPATH environment variable (and hence has no effect for
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Nextstep builds).
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877

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* Changes in Emacs 24.1
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** Completion
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*** Many packages now use the `completion-at-point' command,
rather than implementing separate completion commands.

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*** `completion-at-point' now handles tags and semantic completion.
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*** Completion in a non-minibuffer now tries to detect the end of completion
and pops down the *Completions* buffer accordingly.
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*** New option `completion-cycle-threshold' allows completion cycling.

*** New option `completion-category-overrides' for overriding the
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default completion style in certain circumstances.
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*** New completion style `substring'.
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*** Completion of buffer names uses `substring' completion by default.

*** The option `widget-complete-field' has been removed.
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** Mail changes
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*** The first time you try sending mail, Emacs asks for a mail method.
This is implemented by a new default for `send-mail-function', which
is `sendmail-query-once'.  This offers to use the smtpmail package, or
to use the old defaults relying on external mail facilities
(`sendmail-send-it' on GNU/Linux and other Unix-like systems, and
`mailclient-send-it' on Windows).
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*** Typing C-c m in the buffer made by M-x report-emacs-bug transfers
the report to your desktop's preferred mail client, if there is one.
This uses either the "xdg-email" utility, or Mac OS's "open" command.
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*** See Changes in Specialized Modes and Packages for SMTPmail changes
and Mail mode changes
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** Emacs server and client changes
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*** New option `server-port' specifies the port for TCP Emacs servers.
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*** New emacsclient argument -q/--quiet suppresses some status messages.
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*** New emacsclient argument --frame-parameters specifies the frame
parameters of any newly-created graphical frame.
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*** If emacsclient shuts down due to Emacs signaling an error,
its exit status is 1.

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*** 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.

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** Internationalization changes

*** Emacs now supports display and editing of bidirectional text.
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Right-to-left (RTL) scripts, such as Arabic, Farsi, and Hebrew, are
displayed in the correct visual order as expected by users of those
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scripts.  The display reordering is a "full bidirectionality" class
implementation of the Unicode Bidirectional Algorithm (UBA).  Buffers
with no RTL text should look exactly the same as before.
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**** New buffer-local variable `bidi-display-reordering'.
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To disable display reordering in a buffer, change this to nil.
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**** New buffer-local variable `bidi-paragraph-direction'.
If nil (the default), Emacs determines the base direction of each
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paragraph from its text, as specified by the UBA.  Setting the value
to `right-to-left' or `left-to-right' forces a base direction on each
paragraph.
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Paragraphs with right-to-left base direction are displayed starting at
the right window edge.
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*** Enhanced support for characters with no glyphs in available fonts,
or, on text terminals, characters that cannot be encoded by the
terminal coding system.  The new option `glyphless-char-display-control'
specifies how to display them: as a hexadecimal code in a box, a thin
1-pixel space, an empty box, etc.
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*** New input methods for Farsi and Bulgarian
(farsi-isiri-9147, farsi-transliterate-banan, bulgarian-alt-phonetic).
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*** `nobreak-char-display' now also highlights Unicode hyphen chars
(U+2010 and U+2011).

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

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** 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.
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*** M-x list-packages shows a list of packages, which can be
selected for installation.
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*** New command `describe-package', bound to `C-h P'.
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*** By default, all installed packages are loaded automatically when
Emacs starts up.  To disable this, set `package-enable-at-startup' to
nil.  To specify the packages to load, customize `package-load-list'.
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** Custom theme changes

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*** New command `M-x customize-themes', which provides a convenient
interface for enabling and disabling Custom themes.
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*** New option `custom-theme-load-path' is the load path for themes.
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Emacs no longer looks for Custom themes in `load-path'.  The default
value of `custom-theme-load-path' says to look for themes in
`custom-theme-directory', followed by a subdirectory of
`data-directory' named "themes/", which contains a small selection of
built-in Custom themes.

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*** 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.
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** Improved GTK integration
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*** GTK scroll-bars are now placed on the right by default.
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The function `set-scroll-bar-mode' can change this.

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*** GTK tool bars can have just text, just images or images and text.
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Customize `tool-bar-style' to choose the style.  On a Gnome desktop,
the default is taken from desktop settings.

*** GTK tool bars can be placed on any edge of the frame.
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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.
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*** The default colors for selected text (the `region' face) are taken
from the GTK theme when Emacs is built with GTK.
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*** Emacs uses GTK tooltips by default if built with GTK.
You can disable this by changing `x-gtk-use-system-tooltips' to nil.
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** Graphical interface changes

*** 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.

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

*** Lucid menus and dialogs can display antialiased fonts if Emacs is
built with Xft.  These fonts can be set via X resources, for example:
Emacs.pane.menubar.font: Courier-12

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** Exiting changes
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*** Emacs now calls `kill-emacs' if it receives SIGTERM or SIGHUP,
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or if it receives a SIGINT signal in batch mode.

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*** `kill-emacs-hook' is now also run in batch mode.
Third-party code which adds to `kill-emacs-hook' should check if they
do the right thing in batch mode.
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** Scrolling changes
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*** New scrolling commands `scroll-up-command' and `scroll-down-command'
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(bound to C-v/[next] and M-v/[prior]) do not signal errors at top/bottom
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of buffer at first key-press (instead they move to top/bottom of buffer)
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when `scroll-error-top-bottom' is non-nil.
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*** New option `scroll-error-top-bottom' (see above).

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*** New scrolling commands `scroll-up-line' and `scroll-down-line'
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scroll a line instead of full screen.
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*** New property `scroll-command' should be set on a command's symbol to
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define it as a scroll command affected by `scroll-preserve-screen-position'.
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*** If you customize `scroll-conservatively' to a value greater than 100,
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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.
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