NEWS

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

Copyright (C) 2014-2016 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 25.2

** The new option 'configure --enable-gcc-warnings=warn-only' causes
GCC to issue warnings without stopping the build.  This behavior is
now the default in developer builds.  As before, use
'--disable-gcc-warnings' to suppress GCC's warnings, and
'--enable-gcc-warnings' to stop the build if GCC issues warnings.

+++
** The Emacs server now has socket-launching support.  This allows
socket based activation, where an external process like systemd can
invoke the Emacs server process upon a socket connection event and
hand the socket over to Emacs.  Emacs uses this socket to service
emacsclient commands.  This new functionality can be disabled with the
configure option '--disable-libsystemd'.

** New configure option '--disable-build-details' attempts to build an
Emacs that is more likely to be reproducible; that is, if you build
and install Emacs twice, the second Emacs is a copy of the first.
Deterministic builds omit the build date from the output of the
emacs-version and erc-cmd-SV functions, and the leave the following
variables nil: emacs-build-system, emacs-build-time,
erc-emacs-build-time.

** Emacs no longer works on IRIX.  We expect that Emacs users are not
affected by this, as SGI stopped supporting IRIX in December 2013.


* Startup Changes in Emacs 25.2


* Changes in Emacs 25.2

+++
** A number of accessors for the value returned by 'file-attributes'
has been added.  They are: 'file-attribute-type',
'file-attribute-link-number', 'file-attribute-user-id',
'file-attribute-group-id', 'file-attribute-access-time',
'file-attribute-modification-time',
'file-attribute-status-change-time', 'file-attribute-size',
'file-attribute-modes', 'file-attribute-inode-number', and
'file-attribute-device-number'

+++
** The new function 'buffer-hash' has been added, and can be used to
compute a fash, non-consing hash of the contents of a buffer.

---
** 'fill-paragraph' no longer marks the buffer as changed unless it
actually changed something.

---
** The locale language name 'ca' is now mapped to the language
environment 'Catalan', which has been added.

---
** 'align-regexp' has a separate history for its interactive argument
'align-regexp' no longer shares its history with all other
history-less functions that use 'read-string'

+++
** The networking code has been reworked so that it's more
asynchronous than it was (when specifying :nowait t in
'make-network-process').  How asynchronous it is varies based on the
capabilities of the system, but on a typical GNU/Linux system the DNS
resolution, the connection, and (for TLS streams) the TLS negotiation
are all done without blocking the main Emacs thread.  To get
asynchronous TLS, the TLS boot parameters have to be passed in (see
the manual for details).

Certain process oriented functions (like 'process-datagram-address')
will block until socket setup has been performed.  The recommended way
to deal with asynchronous sockets is to avoid interacting with them
until they have changed status to "run".  This is most easily done
from a process sentinel.

** 'make-network-process' and 'open-network-stream' sometimes allowed
:service to be an integer string (e.g., :service "993") and sometimes
required an integer (e.g., :service 993).  This difference has been
eliminated, and integer strings work everywhere.

** It is possible to disable attempted recovery on fatal signals

Two new variables allow to disable attempts to recover from stack
overflow and to avoid automatic auto-save when Emacs is delivered a
fatal signal.  'attempt-stack-overflow-recovery', if set to 'nil',
will disable attempts to recover from C stack overflows; Emacs will
then crash as with any other fatal signal.
'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
disable attempts to auto-save the session and shut down in an orderly
fashion when Emacs receives a fatal signal; instead, Emacs will
terminate immediately.  Both variables are non-'nil' by default.
These variables are for users who would like to avoid the small
probability of data corruption due to techniques Emacs uses to recover
in these situations.


* Editing Changes in Emacs 25.2


* Changes in Specialized Modes and Packages in Emacs 25.2

** Compilation mode

---
*** Messages from CMake are now recognized.

** eww

+++
*** A new 's' command for switching to another eww buffer via the minibuffer.

---
*** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
with the 'o' command from 'image-map'.

+++
** The commands that add ChangeLog entries now prefer a VCS root directory
for the ChangeLog file, if none already exists.  Customize
'change-log-directory-files' to nil for the old behavior.

---
** Support for non-string values of 'time-stamp-format' has been removed.

** Tramp

** Message

---
*** `message-use-idna' now defaults to t (because Emacs comes with
built-in IDNA support now).

+++
*** New connection method "sg", which allows to edit files under
different group ID.

+++
*** New connection method "doas" for OpenBSD hosts.

---
** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.

** CSS mode

---
*** Support for completing attribute values and bang-rules using the
'completion-at-point' command.

+++
** Emacs now supports character name escape sequences in character and
string literals.  The syntax variants \N{character name} and
\N{U+code} are supported.


* New Modes and Packages in Emacs 25.2


* Incompatible Lisp Changes in Emacs 25.2

+++
** Resizing a frame no longer runs 'window-configuration-change-hook'.
Put your function on 'window-size-change-functions' instead.


* Lisp Changes in Emacs 25.2

** New var syntax-ppss-table to control the syntax-table used in syntax-ppss

** Autoload files can be generated without timestamps,
by setting 'autoload-timestamps' to nil.
FIXME As an experiment, nil is the current default.
If no insurmountable problems before next release, it can stay that way.

** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
in unit tests.

---
** 'gnutls-boot' now takes a parameter :complete-negotiation that says
that negotiation should complete even on non-blocking sockets.

+++
** New functions 'window-pixel-width-before-size-change' and
'window-pixel-height-before-size-change' allow to detect which window
changed size when 'window-size-change-functions' are run.

+++
** New function 'display-buffer-reuse-mode-window' is an action function
suitable for use in 'display-buffer-alist'. For example, to avoid creating
a new window when opening man pages when there's already one, use
(add-to-list 'display-buffer-alist
     '("\\`\\*Man .*\\*\\'" .
       (display-buffer-reuse-mode-window
        (inhibit-same-window . nil)
        (mode . Man-mode))))

+++
** New function 'func-arity' returns information about the argument list
of an arbitrary function.
This is a generalization of 'subr-arity' for functions that are not
built-in primitives.  We recommend using this new function instead of
'subr-arity'.

+++
** 'parse-partial-sexp' state has a new element.  Element 10 is
non-nil when the last character scanned might be the first character
of a two character construct, i.e. a comment delimiter or escaped
character.  Its value is the syntax of that last character.

+++
** 'parse-partial-sexp''s state, element 9, has now been confirmed as
permanent and documented, and may be used by Lisp programs.  Its value
is a list of currently open parenthesis positions, starting with the
outermost parenthesis.

** The function 'redirect-debugging-output' now works on platforms
other than GNU/Linux.

+++
** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
Lisp object suitable for use with 'eq' and 'eql' correspondingly.  If
two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
('sxhash-eql') on them will be the same.

+++
** Function 'sxhash' has been renamed to 'sxhash-equal' for
consistency with the new functions.  For compatibility, 'sxhash'
remains as an alias to 'sxhash-equal'.

+++
** Time conversion functions that accept a time zone rule argument now
allow it to be OFFSET or a list (OFFSET ABBR), where the integer
OFFSET is a count of seconds east of Universal Time, and the string
ABBR is a time zone abbreviation.  The affected functions are
'current-time-string', 'current-time-zone', 'decode-time',
'format-time-string', and 'set-time-zone-rule'.


* Changes in Emacs 25.2 on Non-Free Operating Systems

** Intercepting hotkeys on Windows 7 and later now works better.
The new keyboard hooking code properly grabs system hotkeys such as
Win-* and Alt-TAB, in a way that Emacs can get at them before the
system.  This makes the 'w32-register-hot-key' functionality work
again on all versions of MS-Windows starting with Windows 7.  On
Windows NT and later you can now register any hotkey combination.  (On
Windows 9X, the previous limitations, spelled out in the Emacs manual,
still apply.)


* 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+.
Cairo drawing is an experimental feature in Emacs, and subject to
change in future releases.

+++
** 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'.

---
** 'configure' detects the kqueue file notification library on *BSD
and Mac OS X machines.

---
** 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 you 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.

---
** New make target 'check-expensive' to run additional tests.
This includes all tests which run via "make check", plus additional
tests which take more time to perform.


* 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.

---
** The default height of GUI frames was enlarged.
This is so there's enough space in the initial window to display the
optional text about recovering crashes sessions, without losing the
splash image display.


* Changes in Emacs 25.1

+++
** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
If you have gtk3 and webkitgtk3 installed, and Emacs was built with
xwidget support, you can access the embedded webkit browser with 'M-x
xwidget-webkit-browse-url'.  This opens a new buffer with the embedded
browser.  The buffer will have a new mode, 'xwidget-webkit-mode'
(similar to 'image-mode'), which supports the webkit widget.

+++
*** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
'xwidget-webkit-scroll-up'.

+++
** 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
structs 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.

+++
** A second dir-local file (.dir-locals-2.el) is now accepted.
See the variable 'dir-locals-file-2' for more information.

+++
** 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.

---
** International domain names (IDNA) are now encoded via the new
puny.el library, so that one can visit web sites with non-ASCII URLs.

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

** The new M-s M-w key binding uses eww to search the web for the
text in the region.

+++
** The new 'timer-list' command lists all active timers in a buffer
where you can cancel them with the 'c' command.

** M-x suggests shorthands and ignores obsolete commands for completion.
** x-select-enable-clipboard is renamed select-enable-clipboard.
x-select-enable-primary and 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.

+++
** New option 'switch-to-buffer-in-dedicated-window' allows you to
customize how 'switch-to-buffer' proceeds interactively when the
selected window is strongly dedicated to its buffer.

+++
** The option 'even-window-heights' has been renamed to
'even-window-sizes' and now handles window widths as well.

+++
** New function 'read-multiple-choice' use to prompt for
multiple-choice questions, with a handy way to display help texts.

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

+++
** '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'.

+++
** The Emacs pseudo-random number generator can be securely seeded.
On system where Emacs can access the system entropy or some other
cryptographically secure random stream, it now uses that when 'random'
is called with its argument 't'.  This allows cryptographically strong
random values; in particular, the Emacs server now uses this facility
to produce its authentication key.

---
** New input methods: 'tamil-dvorak' and 'programmer-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 several chars, such as U+2010
(HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH).  As
before, you can type C-x 8 C-h to list shorthands.

+++
*** New minor mode electric-quote-mode for using curved quotes as you
type.  See also the new variable 'text-quoting-style'.

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

---
** Emacs now uses "bracketed paste mode" on text terminals that support it.
Bracketed paste mode causes text terminals to wrap pasted text in special
escape sequences that allow Emacs to tell the difference between text
you type and text you paste from other applications.  Emacs then
avoids interpreting each character in the pasted text as it does with
keyboard input, which results in a paste experience similar to that
under a window system, and significant performance improvements when
pasting large amounts of text.

Bracketed paste mode is disabled by default, so Emacs automatically
enables it at startup if the terminal supports it.

+++
** 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.

+++
** 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'.

+++
** The old 'C-x w' bindings in hi-lock-mode are officially deprecated
in favor of the global 'M-s h' bindings introduced in Emacs-23.1.
They'll disappear soon.

+++
** New bindings for 'query-replace-map'.
'undo', undo the last replacement; bound to 'u'.
'undo-all', undo all replacements; bound to 'U'.


* 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\")"

** Desktop

---
*** The desktop format version has been upgraded from 206 to 208.
Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
cannot read a version 208 desktop.  To upgrade your desktop file, you
must explicitly request the upgrade, by C-u M-x desktop-save.  You are
recommended to do this as soon as you have firmly upgraded to Emacs
25.1 (or later).  Should you ever need to downgrade your desktop file
to version 206, you can do this with C-u C-u M-x desktop-save.

+++
** 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.

** Gnus

+++
*** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
now control how mm-* functions fetch and display images in an HTML
message.  Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
for that purpose, i.e., binds mm-html- variables with those gnus-
variables, but other packages do not have to bind gnus- variables now.

---
*** 'mm-inline-text-html-with-images' has been removed.
Use 'mm-html-inhibit-images' instead.  Note that the value is opposite
in meaning.

** IMAP

---
*** 'imap-ssl-program' has been removed, and imap.el uses the internal
GnuTLS encryption functions if possible.

** 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 way to turn on and off 'save-place' mode has changed.
It is no longer sufficient to load the saveplace library and set
'save-place' non-nil.  Instead, use the two new minor modes:
'save-place-mode' turns on saving last place in every file, and
'save-place-local-mode' does that only for the file in whose buffer it
is invoked.  The 'save-place' variable is now an obsolete alias for
'save-place-mode', which replaces it, and 'toggle-save-place' is an
obsolete alias for the new 'save-place-local-mode' command.

** 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.

*** New variable 'erc-default-port-tls' used to connect to TLS IRC
servers.

---
*** Reconnection is now asynchronous.

---
*** Nick completion is now case-insensitive again after inadvertently
being made case-sensitive in Emacs 24.2.

** MPC

---
*** New commands, key binds, and menu items.

**** '<' and '>' for navigating previous and next tracks in playlist

**** New play/pause command 'mpc-toggle-play' bound to 's'

**** 'g' bound to new command 'mpc-seek-current' will navigate current
     track.

**** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
     toggling playback modes.

---
*** Now supports connecting to a UNIX domain socket.

---
*** Looks at more image file names to use as album art.
Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
(XP) in addition to cover.jpg.

---
*** Searches in more locations for MPD configuration files.
MPD supports the XDG base directory specification since version 0.17.6.

** 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.