NEWS

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

Copyright (C) 2014-2015 Free Software Foundation, Inc.
See the end of the file for license conditions.

Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
If possible, use M-x report-emacs-bug.

This file is about changes in Emacs version 25.

See file HISTORY for a list of GNU Emacs versions and release dates.
See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
and NEWS.1-17 for changes in older Emacs versions.

You can narrow news to a specific version by calling `view-emacs-news'
with a prefix argument or by typing C-u C-h C-n.

Temporary note:
+++ indicates that all necessary documentation updates are complete.
    (This means all relevant manuals in doc/ AND lisp doc-strings.)
--- means no change in the manuals is needed.
When you add a new item, use the appropriate mark if you are sure it applies,
otherwise leave it unmarked.


* Installation Changes in Emacs 25.1

+++
** Building Emacs now requires C99 or later.

+++
** Building Emacs now requires GNU make, version 3.81 or later.

+++
** New configure option --with-cairo.
This builds Emacs with Cairo drawing.  As a side effect, it provides
support for built-in printing, when Emacs was built with GTK+.

** New configure option --with-modules.
This enables support for loading dynamic modules; see below.

---
** By default, Emacs no longer works on IRIX.  We expect that Emacs
users are not affected by this, as SGI stopped supporting IRIX in
December 2013.  If you are affected, please send a bug report.  You
should be able to work around the problem either by porting the Emacs
undumping code to GCC under IRIX, or by configuring --with-wide-int,
or by sticking with Emacs 24.4.

---
** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
since Emacs 24.4, and the other variants were undocumented and were
obstacles to maintenance and development.  GC_MARK_STACK and its
related symbols have been removed from the C internals.

---
** 'configure' now prefers gnustep-config when configuring GNUstep.
If gnustep-config is not available, the old heuristics are used.

---
** 'configure' now prefers inotify to gfile for file notification,
unless gfile is explicitly requested via --with-file-notification='gfile'.

---
** The configure option '--with-pkg-config-prog' has been removed.
Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.

---
** The configure option '--with-mmdf' has been removed.
It was no longer useful, as it relied on libraries that are no longer
supported, and its presence led to confusion during configuration.
This affects only the 'movemail' utility; Emacs itself can still
process MMDF-format files as before.

+++
** The configure option '--enable-silent-rules' is now the default,
and silent rules are now quieter.  To get the old behavior where
'make' chatters a lot, configure with '--disable-silent-rules' or
build with 'make V=1'.

---
** The configure option '--with-gameuser' now allows to specify a
group instead of a user if its argument is prefixed by ':' (a colon).
This will cause the game score files in ${localstatedir}/games/emacs
to be owned by that group, and the helper program for updating them to
be installed setgid.  The option now defaults to the 'games' group.

---
** The `grep-changelog' script (and its manual page) are no longer included.
It has no particular connection to Emacs and has not changed in years,
so if you want to use it, you can always take a copy from an older Emacs.

---
** Emacs 25 comes with a new set of icons.
Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
The old Emacs logo icons are available as `emacs23.png' in the same location.


* Startup Changes in Emacs 25.1

+++
** When Emacs is given a file as a command line argument and
`initial-buffer-choice' is non-nil, display both the file and
`initial-buffer-choice'.  When Emacs is given more than one file and
`initial-buffer-choice' is non-nil, show `initial-buffer-choice'
and *Buffer List*.  This makes Emacs convenient to use from the
command line when `initial-buffer-choice' is non-nil.

+++
** The value of ‘initial-scratch-message’ is now treated as a doc string
and can contain escape sequences for command keys, quotes, and the like.


* Changes in Emacs 25.1

+++
** Any file of the form .dir-locals*.el is now considered a dir-local
file, and multiple such files can be used in the same directory.  See
the variable `dir-locals-file' for more information.

---
** `xref-find-definitions' and `describe-function' now display
information about mode local overrides (defined by cedet/mode-local.el
`define-overloadable-function' `define-mode-local-overrides').

+++
** New `display-buffer' action function `display-buffer-use-some-frame'.
This displays the buffer in an existing frame other than the current
frame, and allows the caller to specify a frame predicate to exclude
frames.

+++
** New documentation command `describe-symbol'.
Works for functions, variables, faces, etc.  It is bound to `C-h o' by
default.

+++
** New function `custom-prompt-customize-unsaved-options' checks for
unsaved customizations and prompts user to customize (if found).  It
is intended for adding to 'kill-emacs-query-functions'.

+++
** Network security (TLS/SSL certificate validity and the like) is
added via the new Network Security Manager (NSM) and controlled via
the `network-security-level' variable.

+++
** C-h l now also lists the commands that were run.

+++
** x-select-enable-clipboard is renamed select-enable-clipboard
and x-select-enable-primary is renamed select-enable-primary.
Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
name it), with the proviso that on some systems (e.g. Windows)
select-enable-primary is ineffective since the system doesn't
have the equivalent of a primary selection.

+++
** terpri gets an optional arg ENSURE to conditionally output a newline.

+++
** New macro `define-advice'.

+++
** `insert-register' now leaves point after the inserted text
when called interactively.  A prefix argument toggles this behavior.

+++
** The new variable `term-file-aliases' replaces some files from lisp/term.
The function `tty-run-terminal-initialization' consults this variable
when deciding what terminal-specific initialization code to run.

---
** New variable `system-configuration-features', listing some of the
main features that Emacs was compiled with.  This is mainly intended
for use in Emacs bug reports.

+++
** A password is now hidden also when typed in batch mode.  Another
hiding character but the default `.' can be used by let-binding the
variable `read-hide-char'.

** Emacs can now load shared/dynamic libraries (modules).
A dynamic Emacs module is a shared library that provides additional
functionality for use in Emacs Lisp programs, just like a package
written in Emacs Lisp would.  The functions `load', `require',
`load-file', etc. were extended to load such modules, as they do with
Emacs Lisp packages.  The new variable `module-file-suffix' holds the
system-dependent value of the file-name extension (`.so' on Posix
hosts) of the module files.

A module should export a C-callable function named
`emacs_module_init', which Emacs will call as part of the call to
`load' or `require' which loads the module.  It should also export a
symbol named `plugin_is_GPL_compatible' to indicate that its code is
released under the GPL or compatible license; Emacs will refuse to
load modules that don't export such a symbol.

If a module needs to call Emacs functions, it should do so through the
API defined and documented in the header file `emacs-module.h'.  Note
that any module that provides Lisp-callable functions will have to use
Emacs functions such as `fset' and `funcall', in order to register its
functions with the Emacs Lisp interpreter.

Modules can create `user-ptr' Lisp objects that embed pointers to C
struct's defined by the module.  This is useful for keeping around
complex data structures created by a module, to be passed back to the
module's functions.  User-ptr objects can also have associated
"finalizers" -- functions to be run when the object is GC'ed; this is
useful for freeing any resources allocated for the underlying data
structure, such as memory, open file descriptors, etc.  A new
predicate `user-ptrp' returns non-nil if its argument is a `user-ptr'
object.

Loadable modules in Emacs are an experimental feature, and subject to
change in future releases.  For that reason, their support is disabled
by default, and must be enabled by using the `--with-modules' option
at configure time.

---
** New input method: `tamil-dvorak'.


* Editing Changes in Emacs 25.1

+++
** M-x suggests shorthands and ignores obsolete commands for completion.

** Changes in undo

+++
*** Successive single-char deletions are collapsed in the undo-log just like
successive char insertions.  Which commands invoke this behavior is
controlled by the new `undo-auto-amalgamate' function.  See the node
"Undo" in the ELisp manual for more details.

+++
*** The heuristic used to insert `undo-boundary' after each command
has changed, so that if a command causes changes in more than just the
current buffer, Emacs now calls `undo-boundary' in every buffer
affected by the command.

+++
** New command `comment-line' bound to `C-x C-;'.

** New and improved facilities for inserting Unicode characters

---
*** Unicode names entered via C-x 8 RET now use substring completion by default.

+++
*** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
€ № ← → ↔ − ≈ ≠ ≤ ≥.  As before, you can type C-x 8 C-h to list shorthands.

+++
*** New minor mode electric-quote-mode for quoting ‘like this’ and “like this”
as you type.  See also the new variable ‘text-quoting-style’.

---
** New minor mode global-eldoc-mode is enabled by default.

---
** Emacs now supports "bracketed paste mode" when running on a terminal
that supports it.  This facility allows Emacs to understand pasted
chunks of text as strings to be inserted, instead of interpreting each
character in the pasted text as actual user input.  This results in a
paste experience similar to that under a window system, and significant
performance improvements when pasting large amounts of text.

+++
** Emacs now supports the latest version of the UBA.
The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
was updated to support all the latest additions and changes introduced
in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
This includes full support for directional isolates and the
Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
standards.

+++
** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.

+++
** New buffer-local `electric-pair-local-mode'.

+++
** New variable `fast-but-imprecise-scrolling' inhibits
fontification during full screen scrolling operations, giving less
hesitant operation during auto-repeat of C-v, M-v at the cost of
possible inaccuracies in the end position.


* Changes in Specialized Modes and Packages in Emacs 25.1

** Checkdoc

+++
*** New command `checkdoc-package-keywords' checks if the
current package keywords are recognized.  Set the new option
`checkdoc-package-keywords-flag' to non-nil to make
`checkdoc-current-buffer' call this function automatically.

+++
*** New function `checkdoc-file' checks for style errors.
It's meant for use together with `compile':
emacs -batch --eval "(checkdoc-file \"subr.el\")"

+++
** New function `bookmark-set-no-overwrite' bound to C-x r M.
It raises an error if a bookmark of that name already exists,
unlike `bookmark-set' which silently updates an existing bookmark.

** JSON

---
*** `json-pretty-print' and `json-pretty-print-buffer' now maintain
the ordering of object keys by default.

---
*** New commands `json-pretty-print-ordered' and
`json-pretty-print-buffer-ordered' pretty prints JSON objects with
object keys sorted alphabetically.

+++
** Prog mode has some support for multi-mode indentation.
This allows better indentation support in modes that support multiple
programming languages in the same buffer, like literate programming
environments or ANTLR programs with embedded Python code.

A major mode can provide indentation context for a sub-mode through
the `prog-indentation-context' variable.  To support this, modes that
provide indentation should use `prog-widen' instead of `widen' and
`prog-first-column' instead of a literal zero.  See the node
"Mode-Specific Indent" in the ELisp manual for more details.

** Prettify Symbols mode

+++
*** Prettify Symbols mode supports custom composition predicates.  By
overriding the default `prettify-symbols-compose-predicate', modes can
specify in which contexts a symbol may be displayed as some Unicode
character.  `prettify-symbols-default-compose-p' is the default which
is suitable for most programming languages such as C or Lisp (but not
(La)TeX).

+++
*** Symbols can be unprettified while point is inside them.
New variable `prettify-symbols-unprettify-at-point' configures this.

** Enhanced xterm support

---
*** The new variable `xterm-screen-extra-capabilities' for configuring xterm.
This variable tells Emacs which advanced capabilities are available in
the xterm terminal emulator used to display Emacs text-mode frames.
The default is to check each capability, and use it if available.
(This variable was introduced in Emacs 24.1, but was not announced in
its NEWS.)

---
*** Killing text now also sets the CLIPBOARD/PRIMARY selection
in the surrounding GUI (using the OSC-52 escape sequence).  This only works
if your xterm supports it and enables the `allowWindowOps' options (disabled
by default at least in Debian, for security reasons).

Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
escape sequence) if your xterm has the feature enabled but for that you
additionally need to add `getSelection' to `xterm-extra-capabilities'.

+++
*** `xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).

---
** The `save-place' variable is replaced by `save-place-mode'.

** ERC

+++
*** ERC can now hide message types by network or channel.
`erc-hide-list' will hide all messages of the specified type, while
`erc-network-hide-list' and `erc-channel-hide-list' will only hide the
specified message types for the respective specified targets.

** Midnight-mode

---
*** `midnight-mode' is now a proper minor mode.

---
*** clean-buffer-*-regexps can now specify buffers via predicate functions.

** package.el

+++
*** New "external" package status.
An external package is any installed package that's not built-in and
not from `package-user-dir', which usually means it's from an entry in
`package-directory-list'.  They are treated much like built-in
packages, in that they cannot be deleted through the package menu and
are not considered for upgrades.

The effect is that a user can manually place a specific version of a
package inside `package-directory-list' and the package menu will
always respect that.

+++
*** If a package is available on multiple archives and one has higher
priority (as per `package-archive-priorities') only that one is
listed.  This can be configured with `package-menu-hide-low-priority'.

+++
*** `package-menu-toggle-hiding' now toggles the hiding of packages.
This includes the above-mentioned low-priority packages, as well as
available packages whose version is lower than the currently installed
version (which were previously impossible to display).
This allows users to downgrade a package if a lower version is
available.

---
*** When filtering the package menu, keywords starting with "arc:" or
"status:" represent package archive or status, respectively, instead
of actual keywords.

---
*** Most functions which involve downloading information now take an
ASYNC argument.  If it is non-nil, package.el performs the download(s)
asynchronously.

---
*** New variable `package-menu-async' controls whether the
package-menu uses asynchronous downloads.

---
*** `package-install-from-buffer' and `package-install-file' work on directories.
This follows the same rules as installing from a .tar file, except the
-pkg file is optional.

---
*** Packages which are dependencies of other packages cannot be deleted.
The FORCE argument to `package-delete' overrides this.

---
*** New custom variable `package-selected-packages' tracks packages
which were installed by the user (as opposed to installed as
dependencies).  This variable can also be manually customized.

---
*** New command `package-install-user-selected-packages' installs all
packages from `package-selected-packages' which are currently missing.

---
*** New command `package-autoremove' removes all packages which were
installed strictly as dependencies but are no longer needed.

+++
** Shell

When you invoke `shell' interactively, the *shell* buffer will now
display in a new window.  However, you can customize this behavior via
the `display-buffer-alist' variable.  For example, to get
the old behavior -- *shell* buffer displays in current window -- use
(add-to-list 'display-buffer-alist
     '("^\\*shell\\*$" . (display-buffer-same-window))).

** EIEIO
+++
*** The `:protection' slot option is not obeyed any more.
+++
*** The `newname' argument to constructors is optional&deprecated.
If you need your objects to be named, do it by inheriting from `eieio-named'.
+++
*** The <class>-list-p and <class>-child-p functions are declared obsolete.
+++
*** The <class> variables are declared obsolete.
+++
*** The <initarg> variables are declared obsolete.
*** defgeneric and defmethod are declared obsolete.
+++
*** `constructor' is now an obsolete alias for `make-instance'.

** ido

+++
*** New command `ido-bury-buffer-at-head' bound to C-S-b
Bury the buffer at the head of `ido-matches', analogous to how C-k
kills the buffer at head.

---
*** A prefix argument to `ido-restrict-to-matches' will reverse its
meaning, and the list is restricted to those elements that do not
match the current input.

** Minibuffer

+++
*** You can use <UP> and <DOWN> arrow keys to move through history by lines.
The new commands `next-line-or-history-element' and
`previous-line-or-history-element', bound to <UP> and <DOWN> in the
minibuffer, allow by-line movement through minibuffer history,
similarly to an ordinary buffer.  Only when point moves over
the bottom/top of the minibuffer it goes to the next/previous history
element.  `M-p' and `M-n' still move directly to previous/next history
item as before.

** Search and Replace

+++
*** New user option `search-default-regexp-mode'
specifies the default mode for I-search.

+++
*** `isearch' and `query-replace' can now perform character folding in matches.
Isearch does that by default, while `query-replace' will do that if
the new variable `replace-character-fold' is customized to a non-nil
value.  This is analogous to case folding, but instead of disregarding
case variants, it disregards wider classes of distinctions between
similar characters.  (Case folding is a special case of character
folding.)  This means many characters in the search string will match
entire groups of characters instead of just themselves.

For instance, the " will match all variants of double quotes (like “
and ”), and the letter a will match all of its accented cousins, even
those composed of multiple characters, as well as many other symbols
like ℀, ℁, ⒜, and ⓐ.

+++
*** New function `character-fold-to-regexp' can be used
by searching commands to produce a regexp matching anything that
character-folds into STRING.

+++
*** The new M-s M-w key binding uses eww to search the web for the
text in the region.  The search engine to use for this is specified by
the customizable variable `eww-search-prefix'.

+++
*** Query-replace history is enhanced.
When query-replace reads the FROM string from the minibuffer, typing
`M-p' will now show previous replacements as "FROM SEP TO", where FROM
and TO are the original text and its replacement, and SEP is an arrow
string defined by the new variable `query-replace-from-to-separator'.
To select a prior replacement, type `M-p' until the desired
replacement appears in the minibuffer, and then exit the minibuffer by
typing RET.

** Calc
+++
*** If `quick-calc' is called with a prefix argument, insert the
result of the calculation into the current buffer.

+++
** In Edebug, you can now set the initial mode with C-x C-a C-m.  With
this you can tell Edebug not to stop at the start of the first
instrumented function.

** ElDoc

+++
*** New minor mode `global-eldoc-mode'
It is turned on by default, and affects `*scratch*' and other buffers
whose major mode supports Emacs Lisp.

---
*** `eldoc-documentation-function' now defaults to `ignore'

---
*** `describe-char-eldoc' displays information about character at point,
and can be used as a default value of `eldoc-documentation-function'.  It is
useful when, for example, one needs to distinguish various spaces (e.g. ] [,
] [, ] [, etc.) while using mono-spaced font.

** eww

---
*** HTML can now be rendered using variable-width fonts.

+++
*** A new command `F' (`eww-toggle-fonts') can be used to toggle
whether to use variable-pitch fonts or not.  The user can also
customize the `shr-use-fonts' variable.

+++
*** A new command `R' (`eww-readable') will try do identify the main
textual parts of a web page and display only that, leaving menus and
the like off the page.

---
*** You can now use several eww buffers in parallel by renaming eww
buffers you want to keep separate.

+++
*** Partial state of the eww buffers (the URIs and the titles of the
pages visited) is now preserved in the desktop file.

+++
*** `eww-after-render-hook' is now called after eww has rendered
the data in the buffer.

---
*** The `eww-reload' command now takes a prefix to not reload via
the net, but just use the local copy of the HTML.

+++
*** The DOM shr and eww uses has been changed to the general Emacs
xml.el/libxml2 DOM, and a new package dom.el has been added to
interact with this DOM.  See the Emacs Lisp manual for interface
details.

+++
*** `mailcap-mime-data' is now consulted when displaying PDF files.

+++
*** The new `S' command will list all eww buffers, and allow managing
them.

---
*** https pages with valid certificates have headers marked in green, while
invalid certificates are marked in red.

** Message mode

---
*** text/html messages that contain inline image parts will be
transformed into multipart/related messages before sending.

+++
** In Show Paren Mode, a parenthesis can be highlighted when point
stands inside it, and certain parens can be highlighted when point is
at BOL or EOL, or in whitespace there.  To enable these, customize,
respectively, `show-paren-when-point-inside-paren' or
`show-paren-when-point-in-periphery'.

** Lisp mode
*** Strings after `:documentation' are highlighted as docstrings.

** Rectangle editing

+++
*** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.

+++
*** C-x C-x in rectangle-mark-mode now cycles through the four corners.
*** `string-rectangle' provides on-the-fly preview of the result.

+++
** New font-lock functions `font-lock-ensure' and `font-lock-flush'.
These should be used in preference to `font-lock-fontify-buffer' when
called from Lisp.

---
** Macro `minibuffer-with-setup-hook' can optionally append a function
to `minibuffer-setup-hook'.

If the first argument of the macro is of the form `(:append FUN)',
then FUN will be appended to `minibuffer-setup-hook', instead of
prepending it.

** cl-lib
*** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.

** Calendar and diary

+++
*** The default `diary-file' is now located in .emacs.d.

+++
*** New commands to insert diary entries with Chinese dates:
`diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
`diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.

+++
*** The calendar can now list and mark diary entries with Chinese dates.
See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.

---
*** The option `calendar-mode-line-format' can now be nil,
which means to do nothing special with the mode line in calendars.

+++
*** New option `calendar-weekend-days'.
The option customizes which day headers receive the
`calendar-weekend-header' face.

---
*** New optional args N and STRING for ‘holiday-greek-orthodox-easter’.

---
*** Many items obsolete since at least version 23.1 have been removed.
The majority were function/variable/face aliases, too numerous to list here.
The remainder were:

**** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
`calendar-two-frame-setup', `european-calendar', `american-calendar'.

**** Hooks `cal-menu-load-hook', `cal-x-load-hook'.

**** Macro `calendar-for-loop'.

**** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.

**** The nil and list forms of `diary-display-function'.

** New ERT function `ert-summarize-tests-batch-and-exit'.

** New js.el option `js-indent-first-init'.

---
** `Info-fontify-maximum-menu-size' can be t for no limit.

+++
** `info-display-manual' can now be given a prefix argument which (any
non-nil value) directs the command to limit the completion
alternatives to currently visited manuals.

---
** ntlm.el has support for NTLM2.

** Rmail

*** The Rmail commands d, C-d and u take optional repeat counts to delete or
undelete multiple messages.

*** Rmail can now render HTML mail messages if your Emacs was built with
libxml2 or if you have the Lynx browser installed.  By default, Rmail
will display the HTML version of a mail message that has both HTML and
plain text parts, if display of HTML email is possible; customize the
`rmail-mime-prefer-html' option to `nil' if you don't want that.

+++
*** In the commands that make summaries by subject, recipients, or senders,
you can no longer use commas to separate regular expressions.

** SES now supports local printer functions; see `ses-define-local-printer'.

** sh-script
*** In sh-mode you can now use `sh-shell' as a file-local variable to
specify the type of shell in use (bash, csh, etc).

*** New value `always' for sh-indent-after-continuation.
This provides old-style ("dumb") indentation of continued lines.

** TLS
---
*** Fatal TLS errors are now silent by default.

** URL

*** The URL package accepts now the protocols "ssh", "scp" and "rsync".
When `url-handler-mode' is enabled, file operations for these
protocols as well as for "telnet" and "ftp" are passed to Tramp.

*** The URL package allows customizing the `url-user-agent' string.
The new `url-user-agent' variable can be customized to be a string or
a function.

*** The new interface variable `url-request-noninteractive' can be used
to specify that we're running in a noninteractive context, and that
we should not be queried about things like TLS certificate validity.

*** If URL is used with a https connection, the first callback argument
plist will contain a :peer element that has the output of
`gnutls-peer-status' (if Emacs is built with GnuTLS support).

** Tramp

+++
*** New connection method "afp", which allows to access Mac OS X
volumes via the Apple Filing Protocol.

+++
*** New connection method "nc", which allows to access dumb busyboxes.

+++
*** Method-specific parameters can be overwritten now with variable
`tramp-connection-properties'.

---
*** Handler for `file-notify-valid-p' for remote machines that support
filesystem notifications.

** SQL mode

*** New user variable `sql-default-directory' enables remote
connections using Tramp.

*** New command `sql-send-line-and-next' sends the current line to the
interactive buffer and advances to the next line, skipping whitespace
and comments.

*** Add support for Vertica SQL.

** VC and related modes

*** Basic push support, via `vc-push', bound to `C-x v P'.
Implemented for Bzr, Git, Hg.  As part of this change, the pre-existing
(undocumented) command vc-hg-push now behaves slightly differently.

*** The new command vc-region-history shows the log+diff of the active region.

+++
*** You can refresh the VC state of a file buffer with `M-x vc-refresh-state'.
This command is useful when you perform version control commands
outside Emacs (e.g., from the shell prompt), or if you switch the VC
back-end for the buffer's file, or remove it from version control.

*** New option `vc-annotate-background-mode' controls whether
the color range from `vc-annotate-color-map' is applied to the
background or to the foreground.

*** `compare-windows' now compares text with the most recently used window
instead of the next window.  The new option `compare-windows-get-window-function'
allows to customize this.

*** Two new faces `compare-windows-removed' and `compare-windows-added'
replace the obsolete face `compare-windows'.

---
*** `log-edit-insert-changelog' converts "(tiny change)" to
"Copyright-paperwork-exempt: yes".  Set `log-edit-rewrite-tiny-change'
nil to disable this.

** VHDL mode supports VHDL'08.

** Calculator: decimal display mode uses "," groups, so it's more
fitting for use in money calculations; factorial works with
non-integer inputs.

** HideIfDef mode now support full C/C++ expressions, argumented macro expansions,
interactive macro evaluation and automatic scanning of #defined symbols.

*** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
name patterns.  Default case-insensitive .h, .hh, .hpp, .hxx, and .h++.
*** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
reinclusion protected header files from being fully hidden.
*** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be excluded.

** TeX mode

*** New custom variable `tex-print-file-extension' to help users who
use PDF instead of DVI.

*** TeX mode now supports Prettify Symbols mode.  When enabling
`prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
many other math macros are displayed using unicode characters.

** whitespace-mode: new 'big-indent style highlighting too much indentation.
By default, 32 spaces and four TABs are considered to be too much but
`whitespace-big-indent-regexp' can be configured to change that.

** tildify: `tildify-space-string', `tildify-pattern', and
`tildify-foreach-region-function' variables added making
`tildify-string-alist', `tildify-pattern-alist', and
`tildify-ignored-environments-alist' variables (as well as a few
helper functions) obsolete.

** xref
The new package provides generic framework and new commands to find
and move to definitions, as well as pop back to the original location.

*** New key bindings
`xref-find-definitions' replaces `find-tag' and provides an interface
to pick one destination among several.  Hence, `tags-loop-continue' is
unbound.  `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
easier binding, which is now unoccupied (`M-,').
`xref-find-definitions-other-window' replaces `find-tag-other-window'.
`xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
`xref-find-apropos' replaces `find-tag-regexp'.

*** New variables
`find-tag-marker-ring-length' is now an obsolete alias for
`xref-marker-ring-length'.  `find-tag-marker-ring' is now an obsolete
alias for a private variable.  `xref-push-marker-stack' and
`xref-pop-marker-stack' should be used to mutate it instead.

** etags
As a result of the above, these commands are now obsolete:
`find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
`tags-apropos' and `tags-loop-continue'.

** EUDC
EUDC's LDAP backend has been improved.

*** EUDC supports LDAP-over-SSL URLs (ldaps://).

*** EUDC passes LDAP passwords through a pipe to the ldapsearch
subprocess instead of on the command line.

*** EUDC handles LDAP wildcards automatically so the user shouldn't
need to configure this manually anymore.

*** The LDAP configuration section of EUDC's manual has been
rewritten.

There have also been customization changes.

*** New custom variable `eudc-server-hotlist' to allow specifying
multiple EUDC servers in init file.

*** Custom variable `eudc-inline-query-format' defaults to completing
on email and firstname instead of surname.

*** Custom variable `eudc-expansion-overwrites-query' defaults to nil
to avoid interfering with the kill ring.

*** Custom variable `eudc-inline-expansion-format' defaults to
"Firstname Surname <mail-address>".

*** Custom variable `eudc-options-file' defaults to
"~/.emacs.d/eudc-options".

*** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
allow overriding the regular expression that recognizes the ldapsearch
command line's password prompt.

EUDC's BBDB backend now supports BBDB 3.

EUDC's PH backend (eudcb-ph.el) is obsolete.

** Eshell

+++
*** The new built-in command `clear' can scroll window contents out of sight.
If provided with an optional non-nil argument, the scrollback contents will be cleared.

*** New buffer syntax '#<buffer-name>', which is equivalent to
'#<buffer buffer-name>'.  This shorthand makes interacting with
buffers from eshell more convenient.  Custom variable
`eshell-buffer-shorthand', which has been broken for a while, has been
removed.

*** By default, eshell "visual" program buffers (created by
`eshell-visual-commands' and similar custom vars) are no longer killed
when their processes die.  This fixes issues with short-lived commands
and makes visual programs more useful in general.  For example, if
"git log" is a visual command, it will always show the visual command
buffer, even if the "git log" process dies.  For the old behavior,
make the new option `eshell-destroy-buffer-when-process-dies' non-nil.

** Browse-url

*** Support for the Conkeror web browser.

---
*** Support for several ancient browsers is now officially obsolete.

+++
** tar-mode: new `tar-new-entry' command, allowing for new members to
be added to the archive.

---
** Autorevert: dired buffers are also auto-reverted via file
notifications, if Emacs is compiled with file notification support.

** File Notifications

+++
*** The new event `stopped' signals, that a file notification watch is
not active any longer.

+++
*** The new function `file-notify-valid-p' checks, whether a file
notification descriptor still corresponds to an activate watch.