** The default X toolkit is now Gtk+, rather than Lucid.
+** 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
+support, the otf library for complex text layout by OpenType fonts,
+and the m17n library for text shaping. Fontconfig-like font names
+(e.g. monospace-12) are accepted. The old font handling code can
+be used by passing the configure option `--disable-font-backend'
+(also available as a run-time option).
+
** The new configuration option "--with-dbus" enables D-Bus language
bindings for Emacs.
** The Mac Carbon port is no longer supported.
-Instead, use... [what?]
+Instead, use... [FIXME what?]
** configure now checks for libgif before libungif when searching for
a GIF library.
Configure will use gcc by default. Set the CC environment variable if
you need control over which C compiler is used.
-** The configure option `--with-gtk' has been removed. Gtk is now the
+** The configure option `--with-gtk' has been removed. Gtk is now the
default toolkit, but you can use --with-x-toolkit=gtk if necessary.
\f
* Changes in Emacs 23.1
+** Completion.
+*** `completion-style' can be customized to choose your favorite completion.
+*** `completion-auto-help' can be set to `lazy' to list the completions only
+if you repeat the completion. This was already supported in
+`partial-completion-mode'.
+
** Emacs now supports using both X displays and ttys in one session.
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
You can test for the presence of this feature in your Lisp code by
testing for the `multi-tty' feature.
+** The Emacs character set is now a superset of Unicode.
+(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.
+
+** There are new Chinese-GBK, Chinese-GB18030, Khmer, Bengali,
+Punjabi, Gujarati, Oriya, Telugu, Sinhala, and TaiViet language
+environments.
+
** 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.
-** Emacs comes with a new set of icons for Mac OS X.
-OS-X-style icons (an application icon and a relevant document icon)
-were contributed by Kentaro Ohkouchi.
-Source files for these icons can be found in Emacs.app/Contents/Resources.
-PNG versions are available as etc/images/icons/emacs*_mac.png.
+** 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.
** Built-in functions (subr) can now have an interactive specification
that is not a prompt string. If the `intspec' parameter of a `DEFUN'
using the client program mev. This C level approach provides mouse
highlighting, and help echoing in the minibuffer.
-** The new variable next-error-recenter specifies how next-error should
+** Recentering changes
+
+*** The new variable next-error-recenter specifies how next-error should
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.
-** New command recenter-top-bottom moves the current line to window
+*** New command recenter-top-bottom moves the current line to window
center, top and bottom on successive invokations.
-** C-l is bound to the new command recenter-top-bottom, rather than recenter.
+*** C-l is bound to the new command recenter-top-bottom, rather than recenter.
** The mode-line displays a `@' if the default-directory for the current buffer
is on a remote machine, or a hyphen otherwise.
** The new command `display-time-world' starts an updating time display
using several time zones, in a buffer.
-** The new variable `emacs-startup-time' gives the time at which Emacs started.
+** The new function `format-seconds' converts a number of seconds into a
+readable string of days, hours, etc.
+
+** The new variables `before-init-time' and `after-init-time' record the
+value of `current-time' before and after Emacs loads the init files.
** The new function `emacs-uptime' returns the uptime of an Emacs instance.
+** The new function `emacs-init-time' returns the duration of the
+Emacs initialization.
+
+** The minor modes unify-8859-on-encoding-mode, unify-8859-on-decoding-mode
+are obsolete.
+
+** The new commands `pp-macroexpand-expression' and `pp-macroexpand-last-sexp'
+pretty-print macro expansions.
+
\f
* Startup Changes in Emacs 23.1
+** 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.
+
** New user option `initial-buffer-choice' specifies what to display
after starting Emacs: startup screen, *scratch* buffer, visiting a
file or directory.
inside of --eval command line arguments in order to access
following arguments.
+** The new command-line option `--disable-font-backend' disables the
+new font backend code at runtime. This option is not available if
+Emacs was compiled without font-backend support.
+
** The abbrev file is no longer read at startup in batch mode.
\f
* Incompatible Editing Changes in Emacs 23.1
\f
* Editing Changes in Emacs 23.1
+** Mark changes
+
+++
-** 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'.
+*** Transient Mark mode is now on by default.
+
++++
+*** mark-even-if-inactive now defaults to t
+
++++
+*** When Transient Mark mode is on, C-SPC C-SPC pushes a mark without activating it.
+++
-** M-q now fills the region if the region is active and
-`transient-mark-mode' is turned on. Otherwise, it fills the current
-paragraph.
+*** When Transient Mark mode is on, M-q now fills the region if the
+region is active. Otherwise, it fills the current paragraph.
+++
-** M-$ now checks spelling of the region if the region is active and
-`transient-mark-mode' is turned on. Otherwise, it checks spelling of the
+*** When Transient Mark mode is on, M-$ now checks spelling of the
+region if the region is active. Otherwise, it checks spelling of the
word at point.
-** TAB now indents the region if the region is active and
-`transient-mark-mode' is turned on.
+*** When Transient Mark mode is on, TAB now indents the region if the
+region is active.
-** `use-empty-active-region' controls whether an empty active region
-in Transient Mark mode should make commands operate on that empty region.
+*** `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).
+
++++
+** 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'.
** C-z now invokes `suspend-frame', C-x C-c now invokes
`save-buffers-kill-terminal'.
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.
-** Minibuffer changes:
+** Minibuffer changes
+
+*** 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.
+
+*** 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.
*** In C-x d, if you type M-n you get the visited file name of the
current buffer.
-*** In Dired, a list of commands for ! extracted from mailcap according to
-file extensions are added to the default list accessible by M-n.
+*** 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.
*** 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
wraps to the first history element. When the search is terminated, the
history element containing the search string becomes the current.
+** 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.
+
\f
* New Modes and Packages in Emacs 23.1
** FIXME add details of new packages imported from lisp/gnus.
+[Maybe some information from doc/misc/gnus-coding.texi can be reused]
** The package doc-view.el has been added. It supports viewing of PDF,
PostScript and DVI documents inside an Emacs buffer by converting the
regular expression in the document. The commentary of the file explains
its usage.
-** The nXML package has been added.
-[FIXME someone who uses this, please write a brief description.]
+** 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:
-** A new game called `bubbles' has been added.
+*** 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.
+
+** A new game called `bubbles' has been added. This is a version of
+the "Same Game" with configurable difficulty level.
** minibuffer-indicate-depth-mode shows the minibuffer depth in the prompt.
inter-process communication mechanism for applications residing on the
same host, based on messages. See the manual for further details.
+** zeroconf.el offers service discovery and service publishing
+interfaces according to the zeroconf specification. It communicates
+with Avahi, a zeroconf implementation, via D-Bus messages on systems
+which have installed this software.
+
** 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.
+
+** 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.
+
+** 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').
+
+** The package linum.el is now included with Emacs. It it a new minor
+mode to display line numbers for the current buffer.
+
+** 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.
+
+** bug-reference.el provides clickable links to bug reports.
+
\f
* Changes in Specialized Modes and Packages in Emacs 23.1
-** ChangeLog now has function bound to C-c C-f that finds the file in
-the current log entry.
+** 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...]
+
+** 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.
** abbrev was rewritten in Elisp and extended with more flexibility.
*** New functions: abbrev-get, abbrev-put, abbrev-table-get, abbrev-table-put,
- abbrev-table-p.
+ abbrev-table-p, abbrev-insert, abbrev-table-menu.
*** 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.
`:parents', `:case-fixed', `:enable-function', `:regexp',
`abbrev-table-modiff'.
-** Help mode.
+** Help mode
*** 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
This is enabled if isearch-buffers-multi is non-nil.
+*** The part of an isearch that failed to match is highlighted in `isearch-fail'
+face.
+
+*** `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.
+
** smerge-refine highlights word-level details of changes in conflict.
It's used automatically as you move through conflicts, see smerge-auto-refine.
** talk.el has been extended for multiple tty support.
-** compilation-auto-jump-to-first-error tells `compile' to jump to
+** 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
the first error encountered during compilations.
** In the `copyright' package, you can specify your copyright holders' names.
Only copyright lines with holders matching copyright-names-regexp will be
considered for update.
+** 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).
+
** eldoc highlights the function argument under point
with the face `eldoc-highlight-function-argument'.
** defcustom accepts new keyword arguments, `:safe' and `:risky', which
set a variable's `safe-local-variable' and `risky-local-variable' property.
-** Etags changes.
+** Etags changes
*** 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.
** VC
+
+*** VC now supports applying VC operations to a set of files at a time.
+This enables VC to work much more effectively with changeset-oriented
+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.
+
+*** vc-dir is a new command that displays file names and their VC
+status. It allows to apply various VC operations to apply a file or a
+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.
-*** VC now supports applying VC operations to a set of files at a time.
+*** In VC Annotate mode, you can type V to toggle the annotation visibility.
-This enables VC to work much more effectively with changeset-oriented
-version-control systems such as Subversion, GNU Arch, Mercurial, and
-Bzr. VC will now pass a multiple-file commit to these systems
-as a single changeset.
+*** In VC Annotate mode, you can type f to show the file revision on
+the current line.
-*** In VC Annotate mode, you can type V to toggle the annotation visibility.
+*** vc-git supports the "git grep" command.
+
+*** Asynchronous VC commands display [Waiting...] in the mode-line
+of the corresponding buffer as long as the asynchronous process is
+active.
+
+*** 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.
** log-edit now has a command bound to C-c C-d to show the diff for
the files involved.
tex-font-script-display, tex-suscript-height-ratio, and
tex-suscript-height-minimum.
-** BibTeX mode:
+** BibTeX mode
-*** New command `bibtex-initialize' (re)initializes BibTeX buffers.
+*** New command `bibtex-initialize' (re)initializes BibTeX buffers.
*** New `bibtex-entry-format' options `whitespace', `braces', and
`string', disabled by default.
When the variable `file-precious-flag' is set, the success of a remote
file copy is checked via the file's checksum.
+** Calendar and diary
+
++++
+*** 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'.
+
++++
+*** 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.
+
+*** 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).
+
** Miscellaneous programming mode changes
*** 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.
+*** 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.
+
*** The variable `fortran-line-length' can change the fixed-form line-length.
*** In Fortran mode, M-; is now bound to the standard comment-dwim,
*** The Gnus package has been updated
+*** 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'.
+
*** 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.
** Miscellaneous
+*** goto-address.el provides two new minor modes, goto-address-mode and
+goto-address-prog-mode, which buttonize URLS and email addresses.
+
*** comint-mode uses `start-file-process' now (see Lisp Changes).
If `default-directory' is a remote file name, subprocesses are started
on the corresponding remote system.
*** The new variable `ffap-rfc-directories' specifies a list of local
directories in which `ffap-rfc' will first search for RFCs.
+*** net-utils has an `iwconfig' command, similar to the existing `ifconfig'.
+It is used to configure wireless interfaces.
+
\f
* Changes in Emacs 23.1 on non-free operating systems
---
** IPv6 is supported on MS-Windows.
Emacs now supports IPv6 on Windows XP and later, and earlier versions
-of Windows with third party IPv6 stacks installed. Previously IPv6 was
+of Windows with third party IPv6 stacks installed. Previously IPv6 was
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.
+---
+** Busy cursor (hourglass) now displays on MS-Windows.
+When Emacs is busy, an hourglass mouse cursor is displayed on Windows.
+Previously only X supported the busy cursor.
+
** 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
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
-w32-pass-multimedia-buttons to nil. See the doc string of that variable
+w32-pass-multimedia-buttons to nil. See the doc string of that variable
for the list of extra keys that are available.
\f
* Incompatible Lisp Changes in Emacs 23.1
+** `functionp' returns nil for special forms.
+I.e., it only returns t for objects that can be passed to `funcall'.
+
++++
+** 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.
+
+** 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.
+
+** 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.
+
+++
** The function `dired-call-process' has been removed.
** The variable `byte-compile-warnings' can now be a list starting with `not',
-meaning to disable the specified warnings. The meaning of this list
+meaning to disable the specified warnings. The meaning of this list
may therefore be the reverse of what you expect (of course, this is
-only an issue if you make use of the new `not' syntax). Rather than
+only an issue if you make use of the new `not' syntax). Rather than
checking/manipulating elements directly, use the new functions
`byte-compile-warning-enabled-p', `byte-compile-disable-warning', and
`byte-compile-enable-warning.'
** `mode-name' is no longer guaranteed to be a string.
Use `(format-mode-line mode-name)' to ensure a string value.
+** 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).
+
\f
* Lisp Changes in Emacs 23.1
+** `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.
+
+** `fill-forward-paragraph-function' specifies which function the filling
+code should use to find paragraph boundaries.
+
+** 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.
+
+** When deleting a terminal, run the special hook `delete-terminal-functions'.
+
+** 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.
+This can be useful for modes such as tar-mode, archive-mode, RMAIL.
+
+** `clear-image-cache' can be told to flush only images of a specific file.
+
** clone-indirect-buffer now runs the clone-indirect-buffer-hook.
+
** `beginning-of-defun-function' now takes one argument, the count
- given to `beginning-of-defun'.
+ given to `beginning-of-defun'.
** The variable `inhibit-changing-match-data', if non-nil, prevents the
search and match primitives from changing the match data.
to use to test whether a command should operate on the region instead
of the usual behavior -- for that, use `use-region-p'.
+** 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.
+
** 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
** The new function `read-color' reads a color name using the minibuffer.
-** The new function `face-all-attributes' returns an alist
-describing all the basic attributes of a given face.
-
** `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.
-** Changes related to multiple tty support.
+** Character code, representation, and charset changes.
+
+The character code space is now 0x0..0x3FFFFF with no gap.
+Characters of code 0x0..0x10FFFF are Unicode characters of the same code points.
+Characters of code 0x3FFF80..0x3FFFFF are raw 8-bit bytes.
+
+Generic characters no longer exist.
+
+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
+is a character. This replaces `char-valid-p', which is now obsolete.
+
+*** 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.
++++
+*** `translation-table-for-input' is now obsolete.
+
+** Code conversion changes
+
+*** 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.
+It has three functionalities:
+ 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.
+
+** Changes related to the new font backend
+
+Which font backends to use can be specified by the X resource "FontBackend".
+For instance, to use both X core fonts and Xft fonts:
+
+Emacs.FontBackend: x,xft
+
+If this resource is not set, Emacs tries to use all font backends
+available on your graphic device.
+
+*** 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.
+
+*** 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.
+
+** Changes related to multiple tty support
*** $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.
*** $DISPLAY is now dynamically inherited from the frame's `display'.
-*** The `window-system' variable has been made frame-local. The new
+*** The `window-system' variable has been made frame-local. The new
`initial-window-system' variable contains the `window-system' value
-for the first frame.
+for the first frame. `window-system' is also now a function that
+takes a frame argument.
*** You can specify a terminal device (`tty' parameter) and a terminal
type (`tty-type' parameter) to `make-terminal-frame'.