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    1 GNU Emacs NEWS -- history of user-visible changes.
    2 
    3 Copyright (C) 2014-2017 Free Software Foundation, Inc.
    4 See the end of the file for license conditions.
    5 
    6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
    7 If possible, use M-x report-emacs-bug.
    8 
    9 This file is about changes in Emacs version 25.
   10 
   11 See file HISTORY for a list of GNU Emacs versions and release dates.
   12 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
   13 and NEWS.1-17 for changes in older Emacs versions.
   14 
   15 You can narrow news to a specific version by calling 'view-emacs-news'
   16 with a prefix argument or by typing C-u C-h C-n.
   17 
   18 
   19 * Changes in Emacs 25.3
   20 
   21 This is an emergency release to fix a security vulnerability in Emacs.
   22 
   23 ** Security vulnerability related to Enriched Text mode is removed.
   24 
   25 *** Enriched Text mode has its support for decoding 'x-display' disabled.
   26 This feature allows saving 'display' properties as part of text.
   27 Emacs 'display' properties support evaluation of arbitrary Lisp forms
   28 as part of instantiating the property, so decoding 'x-display' is
   29 vulnerable to executing arbitrary malicious Lisp code included in the
   30 text (e.g., sent as part of an email message).
   31 
   32 This vulnerability was introduced in Emacs 19.29.  To work around that
   33 in Emacs versions before 25.3, append the following to your ~/.emacs
   34 init file:
   35 
   36   (eval-after-load "enriched"
   37     '(defun enriched-decode-display-prop (start end &optional param)
   38        (list start end)))
   39 
   40 *** Gnus no longer supports "richtext" and "enriched" inline MIME objects.
   41 This support was disabled to avoid evaluation of arbitrary Lisp code
   42 contained in email messages and news articles.
   43 
   44 
   45 * Changes in Emacs 25.2
   46 
   47 This is mainly a bug-fix release, but there are some other changes.
   48 
   49 ** 'find-library', 'help-function-def' and 'help-variable-def' now run
   50 'find-function-after-hook'.
   51 
   52 ** New basic face 'fixed-pitch-serif', for a fixed-width font with serifs.
   53 The 'Info-quoted' and 'tex-verbatim' faces inherit from it by default.
   54 
   55 ** New variable 'use-default-font-for-symbols', for backward compatibility.
   56 This variable allows you to get back pre-Emacs 25 behavior where the
   57 font for displaying symbol and punctuation characters was always
   58 selected according to your fontset setup.  By default, Emacs 25 tries
   59 to use the default face's font for such characters, if it supports
   60 them, disregarding the fontsets.  Set this variable to nil to disable
   61 this and get back the old behavior.
   62 
   63 ** 'electric-quote-mode' is no longer suppressed in a buffer whose
   64 coding system cannot represent curved quote characters.
   65 Instead, users can deal with the unrepresentable characters in the
   66 usual way when they save the buffer.
   67 
   68 ** New variable 'inhibit-compacting-font-caches'.
   69 Set this variable to a non-nil value to speed up display of characters
   70 using large fonts, at the price of a larger memory footprint.
   71 
   72 ** The version number of CC Mode has been changed from 5.33 to
   73 5.32.99, although the software itself hasn't changed.  This aims to
   74 reduce confusion with the standalone CC Mode 5.33 (available from
   75 http://cc-mode.sourceforge.net), which is a more mature version than
   76 the one included in Emacs 25.2.
   77 
   78 
   79 * Installation Changes in Emacs 25.1
   80 
   81 ** Building Emacs now requires C99 or later.
   82 
   83 ** Building Emacs now requires GNU make, version 3.81 or later.
   84 
   85 ** New configure option --with-cairo.
   86 This builds Emacs with Cairo drawing.  As a side effect, it provides
   87 support for built-in printing, when Emacs was built with GTK+.
   88 The Emacs Cairo drawing is experimental and still has some known
   89 display problems.  We encourage more testing of this build and
   90 reporting any problems you find, but it is not recommended for
   91 production.
   92 
   93 ** New configure option --with-modules.
   94 This enables support for loading dynamic modules; see below.
   95 
   96 ** By default, Emacs no longer works on IRIX.  We expect that Emacs
   97 users are not affected by this, as SGI stopped supporting IRIX in
   98 December 2013.  If you are affected, please send a bug report.  You
   99 should be able to work around the problem either by porting the Emacs
  100 undumping code to GCC under IRIX, or by configuring --with-wide-int,
  101 or by sticking with Emacs 24.4.
  102 
  103 ** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
  104 The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
  105 since Emacs 24.4, and the other variants were undocumented and were
  106 obstacles to maintenance and development.  GC_MARK_STACK and its
  107 related symbols have been removed from the C internals.
  108 
  109 ** 'configure' now prefers gnustep-config when configuring GNUstep.
  110 If gnustep-config is not available, the old heuristics are used.
  111 
  112 ** 'configure' now prefers inotify to gfile for file notification,
  113 unless gfile is explicitly requested via --with-file-notification='gfile'.
  114 
  115 ** 'configure' detects the kqueue file notification library on *BSD
  116 and macOS machines.
  117 
  118 ** The configure option '--with-pkg-config-prog' has been removed.
  119 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
  120 
  121 ** The configure option '--with-mmdf' has been removed.
  122 It was no longer useful, as it relied on libraries that are no longer
  123 supported, and its presence led to confusion during configuration.
  124 This affects only the 'movemail' utility; Emacs itself can still
  125 process MMDF-format files as before.
  126 
  127 ** The configure option '--enable-silent-rules' is now the default,
  128 and silent rules are now quieter.  To get the old behavior where
  129 'make' chatters a lot, configure with '--disable-silent-rules' or
  130 build with 'make V=1'.
  131 
  132 ** The configure option '--with-gameuser' now allows you to specify a
  133 group instead of a user if its argument is prefixed by ':' (a colon).
  134 This will cause the game score files in "${localstatedir}/games/emacs"
  135 to be owned by that group, and the helper program for updating them to
  136 be installed setgid.  The option now defaults to the 'games' group.
  137 
  138 ** The 'grep-changelog' script (and its manual page) are no longer included.
  139 It has no particular connection to Emacs and has not changed in years,
  140 so if you want to use it, you can always take a copy from an older Emacs.
  141 
  142 ** Emacs 25 comes with a new set of icons.
  143 Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
  144 The old Emacs logo icons are available as 'emacs23.png' in the same location.
  145 
  146 ** New make target 'check-expensive' to run additional tests.
  147 This includes all tests which run via "make check", plus additional
  148 tests which take more time to perform.
  149 
  150 
  151 * Startup Changes in Emacs 25.1
  152 
  153 ** When Emacs is given a file as a command line argument and
  154 'initial-buffer-choice' is non-nil, display both the file and
  155 'initial-buffer-choice'.  When Emacs is given more than one file and
  156 'initial-buffer-choice' is non-nil, show 'initial-buffer-choice'
  157 and '*Buffer List*'.  This makes Emacs convenient to use from the
  158 command line when 'initial-buffer-choice' is non-nil.
  159 
  160 ** The value of 'initial-scratch-message' is now treated as a doc string
  161 and can contain escape sequences for command keys, quotes, and the like.
  162 
  163 ** The default height of GUI frames was enlarged.
  164 This is so there's enough space in the initial window to display the
  165 optional text about recovering crashes sessions, without losing the
  166 splash image display.
  167 
  168 
  169 * Changes in Emacs 25.1
  170 
  171 ** Xwidgets: a new feature for embedding native widgets inside Emacs buffers.
  172 If you have gtk3 and webkitgtk3 installed, and Emacs was built with
  173 xwidget support, you can access the embedded webkit browser with 'M-x
  174 xwidget-webkit-browse-url'.  This opens a new buffer with the embedded
  175 browser.  The buffer will have a new mode, 'xwidget-webkit-mode'
  176 (similar to 'image-mode'), which supports the webkit widget.
  177 
  178 *** New functions for xwidget-webkit mode 'xwidget-webkit-insert-string',
  179 'xwidget-webkit-adjust-size-dispatch', 'xwidget-webkit-back',
  180 'xwidget-webkit-browse-url', 'xwidget-webkit-reload',
  181 'xwidget-webkit-current-url', 'xwidget-webkit-scroll-backward',
  182 'xwidget-webkit-scroll-forward', 'xwidget-webkit-scroll-down',
  183 'xwidget-webkit-scroll-up'.
  184 
  185 ** Emacs can now load shared/dynamic libraries (modules).
  186 A dynamic Emacs module is a shared library that provides additional
  187 functionality for use in Emacs Lisp programs, just like a package
  188 written in Emacs Lisp would.  The functions 'load', 'require',
  189 'load-file', etc. were extended to load such modules, as they do with
  190 Emacs Lisp packages.  The new variable 'module-file-suffix' holds the
  191 system-dependent value of the file-name extension ('.so' on Posix
  192 hosts) of the module files.
  193 
  194 A module should export a C-callable function named
  195 'emacs_module_init', which Emacs will call as part of the call to
  196 'load' or 'require' which loads the module.  It should also export a
  197 symbol named 'plugin_is_GPL_compatible' to indicate that its code is
  198 released under the GPL or compatible license; Emacs will refuse to
  199 load modules that don't export such a symbol.
  200 
  201 If a module needs to call Emacs functions, it should do so through the
  202 API defined and documented in the header file 'emacs-module.h'.  Note
  203 that any module that provides Lisp-callable functions will have to use
  204 Emacs functions such as 'fset' and 'funcall', in order to register its
  205 functions with the Emacs Lisp interpreter.
  206 
  207 Modules can create 'user-ptr' Lisp objects that embed pointers to C
  208 structs defined by the module.  This is useful for keeping around
  209 complex data structures created by a module, to be passed back to the
  210 module's functions.  User-ptr objects can also have associated
  211 "finalizers" -- functions to be run when the object is GC'ed; this is
  212 useful for freeing any resources allocated for the underlying data
  213 structure, such as memory, open file descriptors, etc.  A new
  214 predicate 'user-ptrp' returns non-nil if its argument is a 'user-ptr'
  215 object.
  216 
  217 Loadable modules in Emacs are an experimental feature, and subject to
  218 change in future releases.  For that reason, their support is disabled
  219 by default, and must be enabled by using the '--with-modules' option
  220 at configure time.
  221 
  222 ** Network security (TLS/SSL certificate validity and the like) is
  223 added via the new Network Security Manager (NSM) and controlled via
  224 the 'network-security-level' variable.
  225 
  226 ** 'C-h l' now also lists the commands that were run.
  227 
  228 ** 'x-select-enable-clipboard' is renamed 'select-enable-clipboard'
  229 and 'x-select-enable-primary' is renamed 'select-enable-primary'.
  230 Additionally they both now apply to all systems (macOS, GNUstep,
  231 MS-Windows, you name it), with the proviso that on some systems (e.g.,
  232 MS-Windows) 'select-enable-primary' is ineffective since the system
  233 doesn't have the equivalent of a primary selection.
  234 
  235 ** New option 'switch-to-buffer-in-dedicated-window' allows you to
  236 customize how 'switch-to-buffer' proceeds interactively when the
  237 selected window is strongly dedicated to its buffer.
  238 
  239 ** The option 'even-window-heights' has been renamed to
  240 'even-window-sizes' and now handles window widths as well.
  241 
  242 ** 'terpri' gets an optional arg ENSURE to conditionally output a newline.
  243 
  244 ** 'insert-register' now leaves point after the inserted text
  245 when called interactively.  A prefix argument toggles this behavior.
  246 
  247 ** The new variable 'term-file-aliases' replaces some files from lisp/term.
  248 The function 'tty-run-terminal-initialization' consults this variable
  249 when deciding what terminal-specific initialization code to run.
  250 
  251 ** New variable 'system-configuration-features', listing some of the
  252 main features that Emacs was compiled with.  This is mainly intended
  253 for use in Emacs bug reports.
  254 
  255 ** A password is now hidden also when typed in batch mode.  Another
  256 hiding character but the default '.' can be used by let-binding the
  257 variable 'read-hide-char'.
  258 
  259 ** The Emacs pseudo-random number generator can be securely seeded.
  260 On systems where Emacs can access the system entropy or some other
  261 cryptographically secure random stream, it now uses that when 'random'
  262 is called with its argument t.  This allows cryptographically strong
  263 random values; in particular, the Emacs server now uses this facility
  264 to produce its authentication key.
  265 
  266 ** New input methods: 'tamil-dvorak', 'programmer-dvorak' and 'probhat'.
  267 
  268 
  269 * Editing Changes in Emacs 25.1
  270 
  271 ** 'M-x' suggests shorthands and ignores obsolete commands for completion.
  272 
  273 ** Changes in undo
  274 
  275 *** Successive single-char deletions are collapsed in the undo-log just like
  276 successive char insertions.  Which commands invoke this behavior is
  277 controlled by the new 'undo-auto-amalgamate' function.  See the node
  278 "Undo" in the ELisp manual for more details.
  279 
  280 *** The heuristic used to insert 'undo-boundary' after each command
  281 has changed, so that if a command causes changes in more than just the
  282 current buffer, Emacs now calls 'undo-boundary' in every buffer
  283 affected by the command.
  284 
  285 ** New command 'comment-line' bound to 'C-x C-;'.
  286 
  287 ** New and improved facilities for inserting Unicode characters
  288 
  289 *** Unicode names entered via 'C-x 8 RET' now use substring completion
  290 by default.
  291 
  292 *** 'C-x 8' now has shorthands for several chars, such as U+2010
  293 (HYPHEN), U+2011 (NON-BREAKING HYPHEN), and U+2012 (FIGURE DASH).  As
  294 before, you can type 'C-x 8 C-h' to list shorthands.
  295 
  296 *** New minor mode 'electric-quote-mode' for using curved quotes as you
  297 type.  See also the new variable 'text-quoting-style'.
  298 
  299 ** New minor mode 'global-eldoc-mode' is enabled by default.
  300 
  301 ** Emacs now uses "bracketed paste mode" on text terminals that support it.
  302 Bracketed paste mode causes text terminals to wrap pasted text in special
  303 escape sequences that allow Emacs to tell the difference between text
  304 you type and text you paste from other applications.  Emacs then
  305 avoids interpreting each character in the pasted text as it does with
  306 keyboard input, which results in a paste experience similar to that
  307 under a window system, and significant performance improvements when
  308 pasting large amounts of text.
  309 
  310 Bracketed paste mode is disabled by default, so Emacs automatically
  311 enables it at startup if the terminal supports it.
  312 
  313 ** Emacs now supports the latest version of the UBA.
  314 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
  315 was updated to support all the latest additions and changes introduced
  316 in Unicode Standard versions 6.3, 7.0, and the latest Unicode 8.0.
  317 This includes full support for directional isolates and the
  318 Bidirectional Parentheses Algorithm (BPA) specified by these Unicode
  319 standards.
  320 
  321 ** You can access 'mouse-buffer-menu' ('C-down-mouse-1') using 'C-f10'.
  322 
  323 ** New buffer-local 'electric-pair-local-mode'.
  324 
  325 ** New variable 'fast-but-imprecise-scrolling' inhibits
  326 fontification during full screen scrolling operations, giving less
  327 hesitant operation during auto-repeat of 'C-v', 'M-v' at the cost of
  328 possible inaccuracies in the end position.
  329 
  330 ** New documentation command 'describe-symbol'.
  331 Works for functions, variables, faces, etc.  It is bound to 'C-h o' by
  332 default.
  333 
  334 ** New function 'custom-prompt-customize-unsaved-options' checks for
  335 unsaved customizations and prompts user to customize (if found).  It
  336 is intended for adding to 'kill-emacs-query-functions'.
  337 
  338 ** The old 'C-x w' bindings in 'hi-lock-mode' are officially deprecated
  339 in favor of the global 'M-s h' bindings introduced in Emacs 23.1.
  340 They'll disappear soon.
  341 
  342 
  343 * Changes in Specialized Modes and Packages in Emacs 25.1
  344 
  345 ** Checkdoc
  346 
  347 *** New command 'checkdoc-package-keywords' checks if the
  348 current package keywords are recognized.  Set the new option
  349 'checkdoc-package-keywords-flag' to non-nil to make
  350 'checkdoc-current-buffer' call this function automatically.
  351 
  352 *** New function 'checkdoc-file' checks for style errors.
  353 It's meant for use together with 'compile':
  354 emacs -batch --eval "(checkdoc-file \"subr.el\")"
  355 
  356 ** Desktop
  357 
  358 *** The desktop format version has been upgraded from 206 to 208.
  359 Although Emacs 25.1 can read a version 206 desktop, earlier Emacsen
  360 cannot read a version 208 desktop.  To upgrade your desktop file, you
  361 must explicitly request the upgrade, by 'C-u M-x desktop-save'.  You are
  362 recommended to do this as soon as you have firmly upgraded to Emacs
  363 25.1 (or later).  Should you ever need to downgrade your desktop file
  364 to version 206, you can do this with 'C-u C-u M-x desktop-save'.
  365 
  366 *** 'desktop-restore-in-current-display' now defaults to t, not nil.
  367 That is, Emacs by default now restores frames into the current display.
  368 
  369 ** New function 'bookmark-set-no-overwrite' bound to 'C-x r M'.
  370 It raises an error if a bookmark of that name already exists,
  371 unlike 'bookmark-set' which silently updates an existing bookmark.
  372 
  373 ** Gnus
  374 
  375 *** New user options 'mm-html-inhibit-images' and 'mm-html-blocked-images'
  376 now control how mm-* functions fetch and display images in an HTML
  377 message.  Gnus still uses 'gnus-inhibit-images' and 'gnus-blocked-images'
  378 for that purpose, i.e., binds mm-html- variables with those gnus-
  379 variables, but other packages do not have to bind gnus- variables now.
  380 
  381 *** 'mm-inline-text-html-with-images' has been removed.
  382 Use 'mm-html-inhibit-images' instead.  Note that the value is opposite
  383 in meaning.
  384 
  385 ** IMAP
  386 
  387 *** 'imap-ssl-program' has been removed, and imap.el uses the internal
  388 GnuTLS encryption functions if possible.
  389 
  390 ** JSON
  391 
  392 *** 'json-encode-string' now only escapes the characters it has to.
  393 Which means that the encoded strings can contain non-ASCII characters.
  394 
  395 *** 'json-pretty-print' and 'json-pretty-print-buffer' now maintain
  396 the ordering of object keys by default.
  397 
  398 *** New commands 'json-pretty-print-ordered' and
  399 'json-pretty-print-buffer-ordered' pretty prints JSON objects with
  400 object keys sorted alphabetically.
  401 
  402 ** Prettify Symbols mode
  403 
  404 *** Prettify Symbols mode supports custom composition predicates.  By
  405 overriding the default 'prettify-symbols-compose-predicate', modes can
  406 specify in which contexts a symbol may be displayed as some Unicode
  407 character.  'prettify-symbols-default-compose-p' is the default which
  408 is suitable for most programming languages such as C or Lisp (but not
  409 (La)TeX).
  410 
  411 *** Symbols can be unprettified while point is inside them.
  412 New variable 'prettify-symbols-unprettify-at-point' configures this.
  413 
  414 ** Enhanced xterm support
  415 
  416 *** The new variable 'xterm-screen-extra-capabilities' for configuring xterm.
  417 This variable tells Emacs which advanced capabilities are available in
  418 the xterm terminal emulator used to display Emacs text-mode frames.
  419 The default is to check each capability, and use it if available.
  420 (This variable was introduced in Emacs 24.1, but was not announced in
  421 its NEWS.)
  422 
  423 *** Killing text now also sets the CLIPBOARD/PRIMARY selection
  424 in the surrounding GUI (using the OSC-52 escape sequence).  This only works
  425 if your xterm supports it and enables the 'allowWindowOps' options (disabled
  426 by default at least in Debian, for security reasons).
  427 
  428 Similarly, you can yank the CLIPBOARD/PRIMARY selection (using the OSC-52
  429 escape sequence) if your xterm has the feature enabled but for that you
  430 additionally need to add 'getSelection' to 'xterm-extra-capabilities'.
  431 
  432 *** 'xterm-mouse-mode' now supports mouse-tracking (if your xterm supports it).
  433 
  434 ** The way to turn on and off 'save-place' mode has changed.
  435 It is no longer sufficient to load the saveplace library and set
  436 'save-place' non-nil.  Instead, use the two new minor modes:
  437 'save-place-mode' turns on saving last place in every file, and
  438 'save-place-local-mode' does that only for the file in whose buffer it
  439 is invoked.  The 'save-place' variable is now an obsolete alias for
  440 'save-place-mode', which replaces it, and 'toggle-save-place' is an
  441 obsolete alias for the new 'save-place-local-mode' command.
  442 
  443 ** ERC
  444 
  445 *** ERC can now hide message types by network or channel.
  446 'erc-hide-list' will hide all messages of the specified type, while
  447 'erc-network-hide-list' and 'erc-channel-hide-list' will only hide the
  448 specified message types for the respective specified targets.
  449 
  450 *** Reconnection is now asynchronous.
  451 
  452 *** Nick completion is now case-insensitive again after inadvertently
  453 being made case-sensitive in Emacs 24.2.
  454 
  455 ** MPC
  456 
  457 *** New commands, key binds, and menu items.
  458 
  459 **** '<' and '>' for navigating previous and next tracks in playlist
  460 
  461 **** New play/pause command 'mpc-toggle-play' bound to 's'
  462 
  463 **** 'g' bound to new command 'mpc-seek-current' will navigate current
  464 track.
  465 
  466 **** New commands 'mpc-toggle-{consume,repeat,single,shuffle}' for
  467 toggling playback modes.
  468 
  469 *** Now supports connecting to a UNIX domain socket.
  470 
  471 *** Looks at more image file names to use as album art.
  472 Case-insensitively tries for .folder.png (freedesktop) and folder.jpg
  473 (XP) in addition to cover.jpg.
  474 
  475 *** Searches in more locations for MPD configuration files.
  476 MPD supports the XDG base directory specification since version 0.17.6.
  477 
  478 ** Midnight-mode
  479 
  480 *** 'midnight-mode' is now a proper minor mode.
  481 
  482 *** clean-buffer-*-regexps can now specify buffers via predicate functions.
  483 
  484 ** package.el
  485 
  486 *** New "external" package status.
  487 An external package is any installed package that's not built-in and
  488 not from 'package-user-dir', which usually means it's from an entry in
  489 'package-directory-list'.  They are treated much like built-in
  490 packages, in that they cannot be deleted through the package menu and
  491 are not considered for upgrades.
  492 
  493 The effect is that a user can manually place a specific version of a
  494 package inside 'package-directory-list' and the package menu will
  495 always respect that.
  496 
  497 *** If a package is available on multiple archives and one has higher
  498 priority (as per 'package-archive-priorities') only that one is
  499 listed.  This can be configured with 'package-menu-hide-low-priority'.
  500 
  501 *** 'package-menu-toggle-hiding' now toggles the hiding of packages.
  502 This includes the above-mentioned low-priority packages, as well as
  503 available packages whose version is lower than the currently installed
  504 version (which were previously impossible to display).
  505 This allows users to downgrade a package if a lower version is
  506 available.
  507 
  508 *** When filtering the package menu, keywords starting with "arc:" or
  509 "status:" represent package archive or status, respectively, instead
  510 of actual keywords.
  511 
  512 *** Most functions which involve downloading information now take an
  513 ASYNC argument.  If it is non-nil, package.el performs the download(s)
  514 asynchronously.
  515 
  516 *** New variable 'package-menu-async' controls whether the
  517 package-menu uses asynchronous downloads.
  518 
  519 *** 'package-install-from-buffer' and 'package-install-file' work on directories.
  520 This follows the same rules as installing from a .tar file, except the
  521 -pkg file is optional.
  522 
  523 *** Packages which are dependencies of other packages cannot be deleted.
  524 The FORCE argument to 'package-delete' overrides this.
  525 
  526 *** New custom variable 'package-selected-packages' tracks packages
  527 which were installed by the user (as opposed to installed as
  528 dependencies).  This variable can also be manually customized.
  529 
  530 *** New command 'package-install-selected-packages' installs all
  531 packages from 'package-selected-packages' which are currently missing.
  532 
  533 *** 'package-install' function now takes a DONT-SELECT argument.  If
  534 this function is called interactively or if DONT-SELECT is nil, add the
  535 package being installed to 'package-selected-packages'.
  536 
  537 *** New command 'package-autoremove' removes all packages which were
  538 installed strictly as dependencies but are no longer needed.
  539 
  540 ** Shell
  541 
  542 When you invoke 'shell' interactively, the '*shell*' buffer will now
  543 display in a new window.  However, you can customize this behavior via
  544 the 'display-buffer-alist' variable.  For example, to get
  545 the old behavior -- '*shell*' buffer displays in current window -- use
  546 (add-to-list 'display-buffer-alist
  547      '("^\\*shell\\*$" . (display-buffer-same-window))).
  548 
  549 ** EIEIO
  550 *** The ':protection' slot option is not obeyed any more.
  551 *** The 'newname' argument to constructors is optional&deprecated.
  552 If you need your objects to be named, do it by inheriting from 'eieio-named'.
  553 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
  554 *** The <class> variables are declared obsolete.
  555 *** The <initarg> variables are declared obsolete.
  556 *** defgeneric and defmethod are declared obsolete.
  557 Use the equivalent facilities from cl-generic.el instead.
  558 *** 'constructor' is now an obsolete alias for 'make-instance'.
  559 *** 'pcase' accepts a new UPattern 'eieio'.
  560 
  561 ** ido
  562 
  563 *** New command 'ido-bury-buffer-at-head' bound to 'C-S-b'.
  564 Bury the buffer at the head of 'ido-matches', analogous to how 'C-k'
  565 kills the buffer at head.
  566 
  567 *** A prefix argument to 'ido-restrict-to-matches' will reverse its
  568 meaning, and the list is restricted to those elements that do not
  569 match the current input.
  570 
  571 ** Minibuffer
  572 
  573 *** You can use <UP> and <DOWN> arrow keys to move through history by lines.
  574 The new commands 'next-line-or-history-element' and
  575 'previous-line-or-history-element', bound to <UP> and <DOWN> in the
  576 minibuffer, allow by-line movement through minibuffer history,
  577 similarly to an ordinary buffer.  Only when point moves over
  578 the bottom/top of the minibuffer it goes to the next/previous history
  579 element.  'M-p' and 'M-n' still move directly to previous/next history
  580 item as before.
  581 
  582 ** Search and Replace
  583 
  584 *** 'isearch' and 'query-replace' can now perform character folding in matches.
  585 This is analogous to case folding, but instead of disregarding case
  586 variants, it disregards wider classes of distinctions between similar
  587 characters.  (Case folding is a special case of character folding.)
  588 This means many characters in the search string will match entire
  589 groups of characters instead of just themselves.
  590 
  591 For instance, the ASCII double quote character " will match all
  592 variants of double quotes, and the letter 'a' will match all of its
  593 accented cousins, even those composed of multiple characters, as well
  594 as many other symbols like U+249C (PARENTHESIZED LATIN SMALL LETTER
  595 A).
  596 
  597 Character folding is enabled by customizing 'search-default-mode' to
  598 the value 'char-fold-to-regexp'.  You can also toggle character
  599 folding in the middle of a search by typing 'M-s ''.
  600 
  601 'query-replace' honors character folding if the new variable
  602 'replace-char-fold' is customized to a non-nil value.
  603 
  604 *** New user option 'search-default-mode'.
  605 This option specifies the default mode for Isearch.  The default
  606 value, nil specifies that Isearch does literal searches (however,
  607 'case-fold-search' and 'isearch-lax-whitespace' may still be applied,
  608 as in previous Emacs versions).
  609 
  610 *** New function 'char-fold-to-regexp' can be used
  611 by searching commands to produce a regexp matching anything that
  612 char-folds into STRING.
  613 
  614 *** The new 'M-s M-w' key binding uses eww to search the web for the
  615 text in the region.  The search engine to use for this is specified by
  616 the customizable variable 'eww-search-prefix'.
  617 
  618 *** 'query-replace' history is enhanced.
  619 When 'query-replace' reads the FROM string from the minibuffer, typing
  620 'M-p' will now show previous replacements as "FROM SEP TO", where FROM
  621 and TO are the original text and its replacement, and SEP is an arrow
  622 string defined by the new variable 'query-replace-from-to-separator'.
  623 To select a prior replacement, type 'M-p' until the desired
  624 replacement appears in the minibuffer, and then exit the minibuffer by
  625 typing RET.
  626 
  627 ** Calc
  628 *** If 'quick-calc' is called with a prefix argument, insert the
  629 result of the calculation into the current buffer.
  630 
  631 ** In Edebug, you can now set the initial mode with 'C-x C-a C-m'.
  632 With this you can tell Edebug not to stop at the start of the first
  633 instrumented function.
  634 
  635 ** ElDoc
  636 
  637 *** New minor mode 'global-eldoc-mode'.
  638 It is turned on by default, and affects '*scratch*' and other buffers
  639 whose major mode supports Emacs Lisp.
  640 
  641 *** 'eldoc-documentation-function' now defaults to 'ignore'.
  642 
  643 *** 'describe-char-eldoc' displays information about character at point,
  644 and can be used as a default value of 'eldoc-documentation-function'.  It is
  645 useful when, for example, one needs to distinguish various spaces - e.g.,
  646 U+00A0 (NO-BREAK SPACE), U+2002 (EN SPACE), and U+2009 (THIN SPACE) - while
  647 using mono-spaced font.
  648 
  649 ** eww
  650 
  651 *** HTML can now be rendered using variable-width fonts.
  652 
  653 *** A new command 'F' ('eww-toggle-fonts') can be used to toggle
  654 whether to use variable-pitch fonts or not.  The user can also
  655 customize the 'shr-use-fonts' variable.
  656 
  657 *** A new command 'R' ('eww-readable') will try do identify the main
  658 textual parts of a web page and display only that, leaving menus and
  659 the like off the page.
  660 
  661 *** A new command 'D' ('eww-toggle-paragraph-direction') allows you to
  662 toggle the paragraph direction between left-to-right and right-to-left.
  663 
  664 *** You can now use several eww buffers in parallel by renaming eww
  665 buffers you want to keep separate.
  666 
  667 *** Partial state of the eww buffers (the URIs and the titles of the
  668 pages visited) is now preserved in the desktop file.
  669 
  670 *** 'eww-after-render-hook' is now called after eww has rendered
  671 the data in the buffer.
  672 
  673 *** The 'eww-reload' command now takes a prefix to not reload via
  674 the net, but just use the local copy of the HTML.
  675 
  676 *** The DOM shr and eww uses has been changed to the general Emacs
  677 xml.el/libxml2 DOM, and a new package dom.el has been added to
  678 interact with this DOM.  See the Emacs Lisp manual for interface
  679 details.
  680 
  681 *** 'mailcap-mime-data' is now consulted when displaying PDF files.
  682 
  683 *** The new 'S' command will list all eww buffers, and allow managing
  684 them.
  685 
  686 *** https pages with valid certificates have headers marked in green, while
  687 invalid certificates are marked in red.
  688 
  689 ** Message mode
  690 
  691 *** text/html messages that contain inline image parts will be
  692 transformed into multipart/related messages before sending.
  693 
  694 ** In Show Paren Mode, a parenthesis can be highlighted when point
  695 stands inside it, and certain parens can be highlighted when point is
  696 at BOL or EOL, or in whitespace there.  To enable these, customize,
  697 respectively, 'show-paren-when-point-inside-paren' or
  698 'show-paren-when-point-in-periphery'.
  699 
  700 ** If gpg2 exists on the system, it is now used as the default value
  701 of 'epg-gpg-program' (instead of gpg).
  702 
  703 ** Lisp mode
  704 
  705 *** Strings after ':documentation' are highlighted as docstrings.
  706 This enhances Lisp mode fontification to handle documentation of the
  707 form '(:documentation "the doc string")' used in Common Lisp code for
  708 CLOS class and slot documentation.
  709 
  710 ** Rectangle editing
  711 
  712 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
  713 
  714 *** 'C-x C-x' in 'rectangle-mark-mode' now cycles through the four corners.
  715 *** 'string-rectangle' provides on-the-fly preview of the result.
  716 
  717 ** New font-lock functions 'font-lock-ensure' and 'font-lock-flush'.
  718 These should be used in preference to 'font-lock-fontify-buffer' when
  719 called from Lisp.
  720 
  721 ** Macro 'minibuffer-with-setup-hook' can optionally append a function
  722 to 'minibuffer-setup-hook'.
  723 
  724 If the first argument of the macro is of the form '(:append FUN)',
  725 then FUN will be appended to 'minibuffer-setup-hook', instead of
  726 prepending it.
  727 
  728 ** cl-lib
  729 *** New functions 'cl-fresh-line', 'cl-digit-char-p', and 'cl-parse-integer'.
  730 
  731 *** 'pcase' accepts the new UPattern 'cl-struct'.
  732 
  733 ** Calendar and diary
  734 
  735 *** The default 'diary-file' is now located in "~/.emacs.d".
  736 
  737 *** New commands to insert diary entries with Chinese dates:
  738 'diary-chinese-insert-anniversary-entry' 'diary-chinese-insert-entry'
  739 'diary-chinese-insert-monthly-entry', 'diary-chinese-insert-yearly-entry'.
  740 
  741 *** The calendar can now list and mark diary entries with Chinese dates.
  742 See 'diary-chinese-list-entries' and 'diary-chinese-mark-entries'.
  743 
  744 *** The option 'calendar-mode-line-format' can now be nil,
  745 which means to do nothing special with the mode line in calendars.
  746 
  747 *** New option 'calendar-weekend-days'.
  748 The option customizes which day headers receive the
  749 'calendar-weekend-header' face.
  750 
  751 *** New optional args N and STRING for 'holiday-greek-orthodox-easter'.
  752 
  753 *** Many items obsolete since at least version 23.1 have been removed.
  754 The majority were function/variable/face aliases, too numerous to list here.
  755 The remainder were:
  756 
  757 **** Functions 'calendar-one-frame-setup', 'calendar-only-one-frame-setup',
  758 'calendar-two-frame-setup', 'european-calendar', 'american-calendar'.
  759 
  760 **** Hooks 'cal-menu-load-hook', 'cal-x-load-hook'.
  761 
  762 **** Macro 'calendar-for-loop'.
  763 
  764 **** Variables 'european-calendar-style', 'diary-face', 'hebrew-holidays-{1,4}'.
  765 
  766 **** The nil and list forms of 'diary-display-function'.
  767 
  768 ** New ERT function 'ert-summarize-tests-batch-and-exit'.
  769 If the output of ERT tests in batch mode execution can be saved to a
  770 log file, then it can be passed as an argument to the above function
  771 to produce a neat summary.
  772 
  773 ** New js.el option 'js-indent-first-init'.
  774 
  775 ** Info
  776 
  777 ** Info mode now displays symbol names in fixed-pitch font.
  778 If you want to get the old behavior back, customize the 'Info-quoted'
  779 face to use the same definitions as the default face.
  780 
  781 *** 'Info-fontify-maximum-menu-size' can be t for no limit.
  782 
  783 *** 'info-display-manual' can now be given a prefix argument which (any
  784 non-nil value) directs the command to limit the completion
  785 alternatives to currently visited manuals.
  786 
  787 ** ntlm.el has support for NTLM2.
  788 
  789 ** Rmail
  790 
  791 *** The Rmail commands 'd', 'C-d' and 'u' take optional repeat counts
  792 to delete or undelete multiple messages.
  793 
  794 *** Rmail can now render HTML mail messages if your Emacs was built with
  795 libxml2 or if you have the Lynx browser installed.  By default, Rmail
  796 will display the HTML version of a mail message that has both HTML and
  797 plain text parts, if display of HTML email is possible; customize the
  798 'rmail-mime-prefer-html' option to nil if you don't want that.
  799 
  800 *** In the commands that make summaries by subject, recipients, or senders,
  801 you can no longer use commas to separate regular expressions.
  802 
  803 ** SES now supports local printer functions; see 'ses-define-local-printer'.
  804 
  805 ** Shell-script Mode
  806 *** In sh-mode you can now use 'sh-shell' as a file-local variable to
  807 specify the type of shell in use (bash, csh, etc).
  808 
  809 *** New value 'always' for 'sh-indent-after-continuation'.
  810 This provides old-style ("dumb") indentation of continued lines.
  811 See the doc string of 'sh-indent-after-continuation' for details.
  812 
  813 ** TLS
  814 *** Fatal TLS errors are now silent by default.
  815 
  816 *** If Emacs isn't built with TLS support, an external TLS-capable
  817 program is used instead.  This program used to be run in --insecure
  818 mode by default, but has now changed to be secure instead, and will
  819 fail if you try to connect to non-verifiable hosts.  This is
  820 controlled by the 'tls-program' variable.
  821 
  822 ** URL
  823 
  824 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
  825 When 'url-handler-mode' is enabled, file operations for these
  826 protocols as well as for "telnet" and "ftp" are passed to Tramp.
  827 
  828 *** The URL package allows customizing the 'url-user-agent' string.
  829 The new 'url-user-agent' variable can be customized to be a string or
  830 a function.
  831 
  832 *** The new interface variable 'url-request-noninteractive' can be used
  833 to specify that we're running in a noninteractive context, and that
  834 we should not be queried about things like TLS certificate validity.
  835 
  836 *** 'url-mime-accept-string' can now be used as in "interface"
  837 variable, meaning you can bind it around an 'url-retrieve' call.
  838 
  839 *** If URL is used with a https connection, the first callback argument
  840 PLIST will contain a :peer element that has the output of
  841 'gnutls-peer-status' (if Emacs is built with GnuTLS support).
  842 
  843 ** Tramp
  844 
  845 *** New connection method "afp", which allows you to access macOS
  846 volumes via the Apple Filing Protocol.
  847 
  848 *** New connection method "nc", which allows you to access dumb
  849 busyboxes.
  850 
  851 *** Method-specific parameters can be overwritten now with variable
  852 'tramp-connection-properties'.
  853 
  854 *** Handler for 'file-notify-valid-p' for remote machines that support
  855 filesystem notifications.
  856 
  857 ** SQL mode
  858 
  859 *** New user variable 'sql-default-directory' enables remote
  860 connections using Tramp.
  861 
  862 *** New command 'sql-send-line-and-next'.
  863 This command, bound to 'C-c C-n' by default, sends the current line to
  864 the SQL process and advances to the next line, skipping whitespace and
  865 comments.
  866 
  867 *** Added support for Vertica SQL.
  868 
  869 ** VC and related modes
  870 
  871 *** Basic push support, via 'vc-push', bound to 'C-x v P'.
  872 Implemented for Bzr, Git, Hg.  As part of this change, the pre-existing
  873 (undocumented) command 'vc-hg-push' now behaves slightly differently.
  874 
  875 *** The new command 'vc-region-history' shows the log+diff of the active region.
  876 
  877 *** You can refresh the VC state of a file buffer with 'M-x vc-refresh-state'.
  878 This command is useful when you perform version control commands
  879 outside Emacs (e.g., from the shell prompt), or if you switch the VC
  880 back-end for the buffer's file, or remove it from version control.
  881 
  882 *** New option 'vc-annotate-background-mode' controls whether
  883 the color range from 'vc-annotate-color-map' is applied to the
  884 background or to the foreground.
  885 
  886 *** New options for customizing encoding of Git commit log messages.
  887 The new user options 'vc-git-commits-coding-system' and
  888 'vc-git-log-output-coding-system' specify the encoding of log messages
  889 sent to Git when committing, and the decoding of log messages read
  890 from Git history commands.  These options default to UTF-8; if
  891 customized, they should be consistent with the Git config variables
  892 i18n.commitEncoding and i18n.logOutputEncoding.
  893 ('vc-git-commits-coding-system' existed previously, but was a
  894 variable, not a user option.)
  895 
  896 *** 'compare-windows' now compares text with the most recently selected window
  897 instead of the next window.  If you want the previous behavior of
  898 comparing with the next window, customize the new option
  899 'compare-windows-get-window-function' to the value
  900 'compare-windows-get-next-window'.
  901 
  902 *** Two new faces 'compare-windows-removed' and 'compare-windows-added'
  903 replace the face 'compare-windows', which is now an obsolete alias for
  904 'compare-windows-added'.
  905 
  906 *** The VC state indicator in the mode line now has different faces
  907 corresponding to each of the possible states.  See the 'vc-faces'
  908 customization group.
  909 
  910 *** 'log-edit-insert-changelog' converts "(tiny change)" to
  911 "Copyright-paperwork-exempt: yes".  Set 'log-edit-rewrite-tiny-change'
  912 nil to disable this.
  913 
  914 *** vc-mcvs.el has been removed.
  915 
  916 ** VHDL mode now supports VHDL'08.
  917 
  918 ** Calculator
  919 
  920 *** Decimal display mode uses "," groups, so it's more
  921 fitting for use in money calculations
  922 
  923 *** Factorial works with non-integer inputs.
  924 
  925 ** Hide-IfDef mode
  926 
  927 *** Hide-IfDef mode now support full C/C++ expressions in macros,
  928 macro argument expansion, interactive macro evaluation and automatic
  929 scanning of #define'd symbols.
  930 
  931 *** New command 'hif-evaluate-macro', bound to 'C-c @ e', displays the
  932 result of evaluating a macro.
  933 
  934 *** New command 'hif-clear-all-ifdef-define', bound to 'C-c @ C', clears
  935 all defined symbols in 'hide-ifdef-env'.
  936 
  937 *** New custom variable 'hide-ifdef-header-regexp' to define C/C++ header
  938 file name patterns.  Defaults to files whose extension is one of '.h',
  939 '.hh', '.hpp', '.hxx', or '.h++', matched case-insensitively.
  940 
  941 *** New custom variable 'hide-ifdef-expand-reinclusion-protection' to prevent
  942 reinclusion protected (a.k.a. "idempotent") header files from being hidden.
  943 (This could happen when an idempotent header file is visited again,
  944 when its guard symbol is already defined.)  Defaults to t.
  945 
  946 *** New custom variable 'hide-ifdef-exclude-define-regexp' to define symbol
  947 name patterns (e.g. all "FOR_DOXYGEN_ONLY_*") to be ignored when
  948 looking for macro definitions.  By default, no symbols are ignored.
  949 
  950 ** TeX mode
  951 
  952 *** New custom variable 'tex-print-file-extension' to help users who
  953 use PDF instead of DVI.
  954 
  955 *** TeX mode now supports Prettify Symbols mode.  When enabling
  956 'prettify-symbols-mode' in a tex-mode buffer, \alpha ... \omega, and
  957 many other math macros are displayed using unicode characters.
  958 
  959 ** New 'big-indent' style in 'whitespace-mode' highlights deep indentation.
  960 By default, 32 consecutive spaces or four consecutive TABs are
  961 considered to be too deep, but the new variable
  962 'whitespace-big-indent-regexp' can be customized to change that.
  963 
  964 ** New options in 'tildify-mode'.
  965 New options 'tildify-space-string', 'tildify-pattern', and
  966 'tildify-foreach-region-function' variables make
  967 'tildify-string-alist', 'tildify-pattern-alist', and
  968 'tildify-ignored-environments-alist' variables (as well as a few
  969 helper functions) obsolete.
  970 
  971 ** New package Xref replaces Etags's front-end and UI.
  972 
  973 The new package Xref provides a generic framework and new commands to
  974 find and move to definitions of functions, macros, data structures
  975 etc., as well as go back to the location where you were before moving
  976 to a definition.  It supersedes and obsoletes many Etags commands,
  977 while still using the etags.el code that reads the TAGS tables as one
  978 of its back-ends.
  979 
  980 The command 'xref-find-definitions' replaces 'find-tag' and provides
  981 an interface to pick one definition among several.
  982 'tags-loop-continue' is now unbound.  'xref-pop-marker-stack' replaces
  983 'pop-tag-mark', but has a keybinding ('M-,') different from the one
  984 'pop-tag-mark' used.
  985 
  986 'xref-find-definitions-other-window' replaces 'find-tag-other-window'.
  987 'xref-find-definitions-other-frame' replaces 'find-tag-other-frame'.
  988 'xref-find-apropos' replaces 'find-tag-regexp'.
  989 
  990 As a result of this, the following commands are now obsolete:
  991 'find-tag-other-window', 'find-tag-other-frame', 'find-tag-regexp',
  992 'tags-apropos'.
  993 
  994 'tags-loop-continue' is not obsolete because it's still useful in
  995 'tags-search' and 'tags-query-replace', for which there are no direct
  996 replacements yet.
  997 
  998 *** Variants of 'tags-search' and 'tags-query-replace' in Dired were also
  999 replaced by xref-style commands, see the "Dired" section below.
 1000 
 1001 *** New variables
 1002 
 1003 'find-tag-marker-ring-length' is now an obsolete alias for
 1004 'xref-marker-ring-length'.  'find-tag-marker-ring' is now an obsolete
 1005 alias for a private variable.  'xref-push-marker-stack' and
 1006 'xref-pop-marker-stack' should be used instead to manipulate the stack
 1007 of searches for definitions.
 1008 
 1009 *** 'xref-find-definitions' and 'describe-function' now display
 1010 information about mode local overrides (defined by cedet/mode-local.el
 1011 'define-overloadable-function' 'define-mode-local-overrides').
 1012 
 1013 The framework's Lisp API is still experimental and can change in major,
 1014 backward-incompatible ways.
 1015 
 1016 ** New package Project
 1017 
 1018 The new package Project provides generic infrastructure for dealing
 1019 with projects.  The main commands included in it are
 1020 'project-find-file' and 'project-find-regexp'.
 1021 
 1022 The Lisp API of this package is still experimental.
 1023 
 1024 ** EUDC
 1025 EUDC's LDAP backend has been improved.
 1026 
 1027 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
 1028 
 1029 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
 1030 subprocess instead of on the command line.
 1031 
 1032 *** EUDC handles LDAP wildcards automatically so the user shouldn't
 1033 need to configure this manually anymore.
 1034 
 1035 *** The LDAP configuration section of EUDC's manual has been
 1036 rewritten.
 1037 
 1038 There have also been customization changes.
 1039 
 1040 *** New custom variable 'eudc-server-hotlist' to allow specifying
 1041 multiple EUDC servers in init file.
 1042 
 1043 *** Custom variable 'eudc-inline-query-format' defaults to completing
 1044 on email and firstname instead of surname.
 1045 
 1046 *** Custom variable 'eudc-expansion-overwrites-query' defaults to nil
 1047 to avoid interfering with the kill ring.
 1048 
 1049 *** Custom variable 'eudc-inline-expansion-format' defaults to
 1050 "Firstname Surname <mail-address>".
 1051 
 1052 *** Custom variable 'eudc-options-file' defaults to
 1053 "~/.emacs.d/eudc-options".
 1054 
 1055 *** New custom variable 'ldap-ldapsearch-password-prompt-regexp' to
 1056 allow overriding the regular expression that recognizes the ldapsearch
 1057 command line's password prompt.
 1058 
 1059 *** EUDC's BBDB backend now supports BBDB 3.
 1060 
 1061 *** EUDC's PH backend (eudcb-ph.el) is obsolete.
 1062 
 1063 ** Eshell
 1064 
 1065 *** The new built-in command 'clear' can scroll window contents out of sight.
 1066 If provided with an optional non-nil argument, the scrollback contents
 1067 will be cleared.
 1068 
 1069 *** New buffer syntax '#<buffer-name>', which is equivalent to
 1070 '#<buffer buffer-name>'.  This shorthand makes interacting with
 1071 buffers from eshell more convenient.  Custom variable
 1072 'eshell-buffer-shorthand', which has been broken for a while, has been
 1073 removed.
 1074 
 1075 *** By default, eshell "visual" program buffers (created by
 1076 'eshell-visual-commands' and similar custom vars) are no longer killed
 1077 when their processes die.  This fixes issues with short-lived commands
 1078 and makes visual programs more useful in general.  For example, if
 1079 "git log" is a visual command, it will always show the visual command
 1080 buffer, even if the "git log" process dies.  For the old behavior,
 1081 make the new option 'eshell-destroy-buffer-when-process-dies' non-nil.
 1082 
 1083 ** Browse-url
 1084 
 1085 *** Support for the Google Chrome web browser.
 1086 
 1087 *** Support for the Conkeror web browser.
 1088 
 1089 *** Support for several ancient browsers is now officially obsolete.
 1090 
 1091 ** 'tar-mode': new 'tar-new-entry' command, allowing for new members to
 1092 be added to the archive.
 1093 
 1094 ** Autorevert
 1095 
 1096 *** Dired buffers are also auto-reverted via file notifications, if
 1097 Emacs is compiled with file notification support.
 1098 
 1099 *** 'auto-revert-use-notify' is set to nil in 'global-auto-revert-mode'.
 1100 See <http://debbugs.gnu.org/22814>.
 1101 
 1102 ** File Notifications
 1103 
 1104 *** The kqueue library is integrated for *BSD and macOS machines.
 1105 
 1106 *** The new event 'stopped' signals, that a file notification watch is
 1107 not active any longer.
 1108 
 1109 *** The new function 'file-notify-valid-p' checks, whether a file
 1110 notification descriptor still corresponds to an activate watch.
 1111 
 1112 ** Dired
 1113 
 1114 *** The command 'dired-do-compress', bound to 'Z', now can compress
 1115 directories and decompress zip files.
 1116 
 1117 *** New command 'dired-do-compress-to', bound to 'c', can be used to
 1118 compress many marked files into a single named archive.  The
 1119 compression command is determined from the new
 1120 'dired-compress-files-alist' variable.
 1121 
 1122 *** New user interface for the 'A' and 'Q' commands.
 1123 These keys, now bound to 'dired-do-find-regexp' and
 1124 'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
 1125 and 'xref-query-replace-in-results': they present the matches
 1126 in the '*xref*' buffer and let you move through the matches.  No need
 1127 to use 'tags-loop-continue' to resume the search or replace loop.  The
 1128 previous commands, 'dired-do-search' and
 1129 'dired-do-query-replace-regexp', are still available, but not bound to
 1130 keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
 1131 back.  We intend to obsolete the old commands in a future release.
 1132 
 1133 ** Tabulated List Mode
 1134 
 1135 *** It is now safe for a mode that derives 'tabulated-list-mode' to not
 1136 call 'tabulated-list-init-header', in which case it will have no
 1137 header.
 1138 
 1139 *** 'tabulated-list-print' takes a second optional argument, UPDATE,
 1140 which specifies an alternative printing method which is faster when
 1141 few or no entries have changed.
 1142 
 1143 ** Obsolete packages
 1144 
 1145 *** gulp.el
 1146 
 1147 *** landmark.el (moved to elpa.gnu.org)
 1148 
 1149 
 1150 * New Modes and Packages in Emacs 25.1
 1151 
 1152 ** pinentry.el allows GnuPG passphrase to be prompted through the
 1153 minibuffer instead of a graphical dialog, depending on whether the gpg
 1154 command is called from Emacs (i.e., INSIDE_EMACS environment variable
 1155 is set).  This feature requires newer versions of GnuPG (2.1.5 or
 1156 later) and Pinentry (0.9.5 or later).  To use this feature, add
 1157 "allow-emacs-pinentry" to "~/.gnupg/gpg-agent.conf" and reload the
 1158 configuration with "gpgconf --reload gpg-agent".
 1159 
 1160 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
 1161 The main entry points are 'cl-defgeneric' and 'cl-defmethod'.  See the
 1162 node "Generic Functions" in the Emacs Lisp manual for more details.
 1163 
 1164 ** 'scss-mode' (a minor variant of 'css-mode') is a major mode for editing
 1165 SCSS (Sassy CSS) files.
 1166 
 1167 ** 'let-alist' is a new macro (and a package) that allows one to easily
 1168 let-bind the values stored in an alist.
 1169 
 1170 ** 'tildify-mode' allows automatic insertion of hard spaces as one
 1171 types the text.  Breaking line after a single-character words is
 1172 forbidden by Czech and Polish typography (and may be discouraged in
 1173 other languages), so 'auto-tildify-mode' makes it easier to create
 1174 a typographically-correct documents.
 1175 
 1176 ** The 'seq' library adds sequence manipulation functions and macros
 1177 that complement basic functions provided by subr.el.  All functions
 1178 are prefixed with 'seq-' and work on lists, strings and vectors.
 1179 'pcase' accepts a new Upattern 'seq'.
 1180 
 1181 ** The 'map' library provides map-manipulation functions that work on
 1182 alists, hash-table and arrays.  All functions are prefixed with
 1183 'map-'.  'pcase' accepts a new UPattern 'map'.
 1184 
 1185 ** The 'thunk' library provides functions and macros to control the
 1186 evaluation of forms.
 1187 
 1188 ** 'js-jsx-mode' (a minor variant of 'js-mode') provides indentation
 1189 support for JSX, an XML-like syntax extension to ECMAScript.
 1190 
 1191 
 1192 * Incompatible Lisp Changes in Emacs 25.1
 1193 
 1194 ** 'setq' and 'setf' must now be called with an even number of
 1195 arguments.  The earlier behavior of silently supplying a nil to the
 1196 last variable when there was an odd number of arguments has been
 1197 eliminated.
 1198 
 1199 ** 'syntax-begin-function' is declared obsolete.
 1200 Removed 'font-lock-beginning-of-syntax-function' and the SYNTAX-BEGIN
 1201 slot in 'font-lock-defaults'.
 1202 
 1203 ** The new implementation of Subword mode affects word movement everywhere.
 1204 When Subword mode is turned on, 'forward-word', 'backward-word', and
 1205 everything that uses them will move by sub-words, effectively
 1206 overriding the buffer's syntax table.  Lisp programs that shouldn't be
 1207 affected by Subword mode should call the new functions
 1208 'forward-word-strictly' and 'backward-word-strictly' instead.
 1209 
 1210 ** 'package-initialize' now sets 'package-enable-at-startup' to nil if
 1211 called during startup.  Users who call this function in their init
 1212 file and still expect it to be run after startup should set
 1213 'package-enable-at-startup' to t after the call to
 1214 'package-initialize'.
 1215 
 1216 ** ':global' minor mode use 'setq-default' rather than 'setq'.
 1217 This means that you can't use 'make-local-variable' and expect them to
 1218 "magically" become buffer-local.
 1219 
 1220 ** 'track-mouse' no longer freezes the shape of the mouse pointer.
 1221 The 'track-mouse' form no longer refrains from changing the shape of
 1222 the mouse pointer for the entire time the body of that form is
 1223 executed.  Lisp programs that use 'track-mouse' for dragging across
 1224 large portions of the Emacs display, and want to avoid changes in the
 1225 pointer shape during dragging, should bind the variable 'track-mouse'
 1226 to the special value 'dragging' in the body of the form.
 1227 
 1228 ** The optional PREDICATE argument of 'lisp-complete-symbol' no longer
 1229 has any effect.  (This change was made in Emacs 24.4 but was not
 1230 advertised at the time.)
 1231 
 1232 ** 'indirect-function' does not signal 'void-function' any more.
 1233 This is mostly a bug-fix, since this change was missed back in 24.4 when
 1234 'symbol-function' was changed not to signal 'void-function' any more.
 1235 
 1236 *** As a consequence, the second arg of 'indirect-function' is now obsolete.
 1237 
 1238 ** 'M-x shell' and 'M-x compile' no longer set the EMACS environment variable.
 1239 This avoids clashing when other programs use the variable for other purposes.
 1240 Although 'M-x term' still sets EMACS for compatibility with Bash 4.3
 1241 and earlier, this is deprecated and will be phased out when Bash 4.4
 1242 or later takes over.  Use the INSIDE_EMACS environment variable instead.
 1243 
 1244 ** 'save-excursion' does not save&restore the mark any more.
 1245 Use 'save-mark-and-excursion' if you want the old behavior.
 1246 
 1247 ** 'read-buffer' and 'read-buffer-function' can now be called with a 4th
 1248 argument (PREDICATE).
 1249 
 1250 ** 'completion-table-dynamic' by default stays in the minibuffer.
 1251 The minibuffer will be the current buffer when the function is called.
 1252 If you want the old behavior of calling the function in the buffer
 1253 from which the minibuffer was entered, use the new argument
 1254 SWITCH-BUFFER to 'completion-table-dynamic'.
 1255 
 1256 ** window-configurations no longer record the buffers' marks.
 1257 
 1258 ** 'inhibit-modification-hooks' now also inhibits lock-file checks, as
 1259 well as active region handling.
 1260 
 1261 ** 'deactivate-mark' is now buffer-local.
 1262 
 1263 ** 'cl-the' now asserts that its argument is of the given type.
 1264 
 1265 ** 'process-running-child-p' may now return a numeric process
 1266 group ID instead of t.
 1267 
 1268 ** Mouse click events on mode line or header line no longer include
 1269 any reference to a buffer position.  The 6th member of the mouse
 1270 position list returned for such events is now nil.
 1271 
 1272 ** Menu items in keymaps do not support the "key shortcut cache" any more.
 1273 These slots used to hold key-shortcut data, but have been obsolete since
 1274 Emacs 21.
 1275 
 1276 ** Emacs no longer downcases the first letter of a system diagnostic
 1277 when signaling a file error.  For example, it now reports "Permission
 1278 denied" instead of "permission denied".  The old behavior was problematic
 1279 in languages like German where downcasing rules depend on grammar.
 1280 
 1281 ** New variable 'text-quoting-style' to control how Emacs translates quotes.
 1282 Set it to 'curve' for curved single quotes, to 'straight' for straight
 1283 apostrophes, and to 'grave' for grave accent and apostrophe.  The
 1284 default value nil acts like 'curve' if curved single quotes are
 1285 displayable, and like 'grave' otherwise.  The new variable affects
 1286 display of diagnostics and help, but not of info.  As the variable is
 1287 not intended for casual use, it is not a user option.
 1288 
 1289 ** Message-issuing functions like 'message' and 'error' now translate
 1290 various sorts of single quotes in their format strings according to
 1291 the value of 'text-quoting-style' (see above).  This translation
 1292 cannot be disabled.  To get the old behavior, use 'format', which is
 1293 not affected by 'text-quoting-style', e.g., (message "%s" (format
 1294 "...." foo bar)).
 1295 
 1296 ** 'substitute-command-keys' now replaces quotes.
 1297 That is, it converts documentation strings' quoting style as per the
 1298 value of 'text-quoting-style'.  Doc strings in source code can use
 1299 either curved single quotes or grave accents and apostrophes.  As
 1300 before, characters preceded by \= are output as-is.
 1301 
 1302 ** The character classes [:alpha:] and [:alnum:] in regular expressions
 1303 now match multibyte characters using Unicode character properties.
 1304 If you want the old behavior where they matched any character with
 1305 word syntax, use '\sw' instead.
 1306 
 1307 ** The character classes [:graph:] and [:print:] in regular expressions
 1308 no longer match every multibyte character.  Instead, Emacs now
 1309 consults the Unicode character properties to determine which
 1310 characters are graphic or printable.  In particular, surrogates and
 1311 unassigned codepoints are now rejected.  If you want the old behavior,
 1312 use [:multibyte:] instead.
 1313 
 1314 ** The 'diff' command uses the unified format now.  To restore the old
 1315 behavior, set 'diff-switches' to '-c'.
 1316 
 1317 ** 'grep-template' and 'grep-find-template' values don't include the
 1318 --color argument anymore.  It's added at the <C> place holder position
 1319 dynamically.  Any third-party code that changes these templates should
 1320 be updated accordingly.
 1321 
 1322 ** '(/ N)' is now equivalent to '(/ 1 N)' rather than to '(/ N 1)'.
 1323 The new behavior is compatible with Common Lisp and with XEmacs.
 1324 This change does not affect Lisp code intended to be portable to
 1325 Emacs 24.2 and earlier, which did not support unary '/'.
 1326 
 1327 ** The 'default-directory' value doesn't have to end slash.  To make
 1328 that happen, 'unhandled-file-name-directory' now defaults to calling
 1329 'file-name-as-directory'.
 1330 
 1331 ** The URL package now insists on sending only unibyte strings to server
 1332 This means packages that use URL cannot bind 'url-request-data' to
 1333 multibyte strings.  If non-ASCII characters should be part of the URL
 1334 payload, then 'url-request-data' should be encoded to become a unibyte
 1335 string.
 1336 
 1337 
 1338 * Lisp Changes in Emacs 25.1
 1339 
 1340 ** 'pcase'
 1341 *** New UPatterns 'quote', 'app'.
 1342 *** New UPatterns can be defined with 'pcase-defmacro'.
 1343 *** New vector QPattern.
 1344 
 1345 ** 'syntax-propertize' is now automatically called on-demand during forward
 1346 parsing functions like 'forward-sexp'.
 1347 
 1348 ** New hooks 'prefix-command-echo-keystrokes-functions' and
 1349 'prefix-command-preserve-state-hook' allow the definition of prefix
 1350 commands other than the predefined 'C-u'.
 1351 
 1352 ** New functions 'filepos-to-bufferpos' and 'bufferpos-to-filepos'.
 1353 These allow conversion between buffer positions and the corresponding
 1354 file byte offsets, given the file's encoding.
 1355 
 1356 ** The default value of 'load-read-function' is now 'read'.
 1357 Previously, the default value of nil implied using 'read'.
 1358 
 1359 ** New hook 'pre-redisplay-functions'.
 1360 It is a bit easier to use than 'pre-redisplay-function'.
 1361 
 1362 ** The second arg of 'looking-back' should always be provided explicitly.
 1363 Previously, it was an optional argument, now it's mandatory.
 1364 
 1365 ** Text properties 'intangible', 'point-entered', and 'point-left' are obsolete.
 1366 Replaced by properties 'cursor-intangible' and 'cursor-sensor-functions',
 1367 implemented by the new 'cursor-intangible-mode' and
 1368 'cursor-sensor-mode' minor modes.
 1369 
 1370 ** 'inhibit-point-motion-hooks' now defaults to t and is obsolete.
 1371 Use the new minor modes 'cursor-intangible-mode' and
 1372 'cursor-sensor-mode' instead.
 1373 
 1374 ** New process type 'pipe', which can be used in combination with the
 1375 ':stderr' keyword of 'make-process' to handle standard error output
 1376 of subprocess.
 1377 
 1378 ** New function 'make-process' provides an alternative interface to
 1379 'start-process'.  It allows programs to set process parameters such as
 1380 process filter, sentinel, etc., through keyword arguments (similar to
 1381 'make-network-process').
 1382 
 1383 ** Subprocesses are automatically told about changes in window dimensions.
 1384 The new option 'window-adjust-process-window-size-function' controls
 1385 how subprocesses are told to adapt their logical window sizes to
 1386 changes in the Emacs window configuration.  Its default value calls
 1387 'set-process-window-size' with the smallest dimensions of all the
 1388 windows that display the subprocess's buffer.
 1389 
 1390 ** A new function 'directory-files-recursively' returns all matching
 1391 files (recursively) under a directory.
 1392 
 1393 ** New variable 'inhibit-message', when bound to non-nil, inhibits
 1394 'message' and related functions from displaying messages in the echo
 1395 area.  The output is still logged to the '*Messages*' buffer.
 1396 
 1397 ** A new text property 'inhibit-read-only' can be used in read-only
 1398 buffers to allow certain parts of the text to be writable.
 1399 
 1400 ** A new variable 'comment-end-can-be-escaped' is useful in languages
 1401 such as C and C++ where line comments with escaped newlines are
 1402 continued to the next line.
 1403 
 1404 ** New macro 'define-advice'.
 1405 
 1406 ** Emacs Lisp now supports generators.
 1407 See the "Generators" section of the ELisp manual for the details.
 1408 
 1409 ** New finalizer facility for running code when objects become unreachable.
 1410 See the "Finalizer Type" subsection in the ELisp manual for the
 1411 details.
 1412 
 1413 ** Lexical closures can use '(:documentation FORM)' to build their docstring.
 1414 It should be placed right where the docstring would be, and FORM is then
 1415 evaluated (and should return a string) when the closure is built.
 1416 
 1417 ** 'define-inline' provides a new way to define inlinable functions.
 1418 
 1419 ** New function 'macroexpand-1' to perform a single step of macro expansion.
 1420 
 1421 ** Some "x-*" functions were obsoleted and/or renamed:
 1422 *** 'x-select-text' is renamed 'gui-select-text'.
 1423 *** 'x-selection-value' is renamed 'gui-selection-value'.
 1424 *** 'x-get-selection' is renamed 'gui-get-selection'.
 1425 *** 'x-get-clipboard' and 'x-clipboard-yank' are marked obsolete.
 1426 *** 'x-get-selection-value' is renamed to 'gui-get-primary-selection'.
 1427 *** 'x-set-selection' is renamed to 'gui-set-selection'.
 1428 
 1429 ** New function 'string-greaterp', which return the opposite result of
 1430 'string-lessp'.
 1431 
 1432 ** The new functions 'string-collate-lessp' and 'string-collate-equalp'
 1433 preserve the collation order as defined by the system's locale(1)
 1434 environment.  For the time being this is implemented for modern POSIX
 1435 systems and for MS-Windows, for other systems they fall back to their
 1436 counterparts 'string-lessp' and 'string-equal'.
 1437 
 1438 *** The ls-lisp package uses 'string-collate-lessp' to sort file names.
 1439 The effect is that, on systems that use ls-lisp for Dired, the default
 1440 sort order of the files in Dired is now different from what it was in
 1441 previous versions of Emacs.  In particular, the file names are sorted
 1442 disregarding punctuation, accents, and diacritics, and letter case is
 1443 ignored.  For example, files whose name begin with a period will no
 1444 longer appear near the beginning of the directory listing.  If you
 1445 want the old, locale-independent sorting, customize the new option
 1446 'ls-lisp-use-string-collate' to the nil value.
 1447 
 1448 *** The MS-Windows specific variable 'w32-collate-ignore-punctuation',
 1449 if set to a non-nil value, causes the above 2 functions to ignore
 1450 symbol and punctuation characters when collating strings.  This
 1451 emulates the behavior of modern Posix platforms when the locale's
 1452 codeset is "UTF-8" (as in "en_US.UTF-8").  This is needed because
 1453 MS-Windows doesn't support UTF-8 as codeset in its locales.
 1454 
 1455 ** New function 'alist-get', which is a generalized variable
 1456 suitable for use with 'setf'.
 1457 
 1458 ** New function 'funcall-interactively', which works like 'funcall'
 1459 but makes 'called-interactively-p' treat the function as (you guessed it)
 1460 called interactively.
 1461 
 1462 ** New function 'function-put' to use instead of 'put' for function properties.
 1463 
 1464 ** The new function 'bidi-find-overridden-directionality' allows you to
 1465 find characters whose directionality was, perhaps maliciously,
 1466 overridden by directional override control characters.  Lisp programs
 1467 can use this to detect potential phishing of URLs and other links that
 1468 exploits bidirectional display reordering.
 1469 
 1470 ** The new function 'buffer-substring-with-bidi-context' allows you to
 1471 copy a portion of a buffer into a different location while preserving
 1472 the visual appearance both of the copied text and the text at
 1473 destination, even when the copied text includes mixed bidirectional
 1474 text and directional control characters.
 1475 
 1476 ** New properties that can be specified with 'declare':
 1477 *** '(interactive-only INSTEAD)', says to use INSTEAD for non-interactive use.
 1478 *** '(pure VAL)', if VAL is non-nil, indicates the function is pure.
 1479 *** '(side-effect-free VAL)', if VAL is non-nil, indicates the function does not
 1480 have side effects.
 1481 
 1482 ** New macro 'with-file-modes', for evaluating expressions with default file
 1483 permissions set to temporary values (e.g., for creating private files).
 1484 
 1485 ** You can access the slots of structures using 'cl-struct-slot-value'.
 1486 
 1487 ** Function 'sort' can deal with vectors.
 1488 
 1489 ** Function 'system-name' now returns an updated value if the current
 1490 system's name has changed or if the Emacs process has changed systems.
 1491 To avoid long waits it no longer consults DNS to canonicalize the name
 1492 (in some cases this may affect generated message-id headers - customize
 1493 'message-user-fqdn' if this bothers you). The variable 'system-name'
 1494 is now obsolete.
 1495 
 1496 ** Function 'write-region' no longer outputs "Wrote FILE" in batch mode.
 1497 
 1498 ** If 'pwd' is called with a prefix argument, insert the current default
 1499 directory at point.
 1500 
 1501 ** New functions return extended information about fonts and faces.
 1502 
 1503 *** The function 'font-info' now returns more details about a font.
 1504 In particular, it now returns the average width of the font's
 1505 characters, which can be used for geometry-related calculations.
 1506 
 1507 *** A new function 'default-font-width' returns the average width of a
 1508 character in the current buffer's default font.  If the default face
 1509 is remapped (see 'face-remapping-alist'), the value for the remapped
 1510 face is returned.  This function complements the existing function
 1511 'default-font-height'.
 1512 
 1513 *** New functions 'window-font-height' and 'window-font-width' return
 1514 the height and average width of characters in a specified face and
 1515 window.  If FACE is remapped (see 'face-remapping-alist'), the
 1516 function returns the information for the remapped face.
 1517 
 1518 *** A new function 'window-max-chars-per-line' returns the maximal
 1519 number of characters that can be displayed on one line.  If a face
 1520 and/or window are provided, these values are used for the
 1521 calculation.  This function is different from 'window-body-width' in
 1522 that it accounts for (i) continuation glyphs, (ii) the size of the
 1523 font, and (iii) the specified window.
 1524 
 1525 ** New utilities in subr-x.el:
 1526 
 1527 *** New macros 'if-let' and 'when-let' allow defining bindings and to
 1528 execute code depending whether all values are true.
 1529 
 1530 *** New macros 'thread-first' and 'thread-last' allow threading a form
 1531 as the first or last argument of subsequent forms.
 1532 
 1533 ** Documentation strings now support quoting with curved single quotes
 1534 in addition to the old style with grave accent and apostrophe.  The
 1535 new style looks better on today's displays.  In the new Electric Quote
 1536 mode, you can enter curved single quotes into documentation by typing
 1537 grave accent and apostrophe.  Outside Electric Quote mode, you can
 1538 enter them by typing 'C-x 8 [' and 'C-x 8 ]', or (if your Alt key
 1539 works) by typing 'A-[' and 'A-]'.  As described above under
 1540 'text-quoting-style', the user can specify how to display doc string
 1541 quotes.
 1542 
 1543 ** New function 'format-message' is like 'format' and also converts
 1544 curved single quotes, grave accents and apostrophes as per
 1545 'text-quoting-style'.
 1546 
 1547 ** 'show-help-function's arg is converted via 'substitute-command-keys'
 1548 before being passed to the function.  Help strings, help-echo
 1549 properties, etc. can therefore contain command key escapes and
 1550 quotation marks.
 1551 
 1552 ** Time-related changes:
 1553 
 1554 *** Time conversion functions now accept an optional ZONE argument
 1555 that specifies the time zone rules for conversion.  ZONE is omitted or
 1556 nil for Emacs local time, t for Universal Time, 'wall' for system wall
 1557 clock time, or a string as in the TZ environment variable.  The
 1558 affected functions are 'current-time-string', 'current-time-zone',
 1559 'decode-time', and 'format-time-string'.  The function 'encode-time',
 1560 which already accepted a simple time zone rule argument, has been
 1561 extended to accept all the new forms.
 1562 
 1563 *** Incompatible change in the third argument of 'format-time-string'.
 1564 Previously, any non-nil argument was interpreted as specifying Universal Time.
 1565 This is no longer true; packages that want Universal Time should pass t
 1566 as the third argument.
 1567 
 1568 *** Time-related functions now consistently accept numbers
 1569 (representing seconds since the epoch) and nil (representing the
 1570 current time) as well as the usual list-of-integer representation.
 1571 Affected functions include 'current-time-string', 'current-time-zone',
 1572 'decode-time', 'float-time', 'format-time-string', 'seconds-to-time',
 1573 'time-add', 'time-less-p', 'time-subtract', 'time-to-day-in-year',
 1574 'time-to-days', and 'time-to-seconds'.
 1575 
 1576 *** The 'encode-time-value' and 'with-decoded-time-value' macros have
 1577 been obsoleted.
 1578 
 1579 *** 'calendar-next-time-zone-transition', 'time-add', and
 1580 'time-subtract' no longer return time values in the obsolete and
 1581 undocumented integer-pair format.  Instead, they return a list of two
 1582 integers.
 1583 
 1584 ** New function 'set-binary-mode' allows switching a standard stream
 1585 of the Emacs process to binary I/O mode.
 1586 
 1587 ** The new function 'directory-name-p' can be used to check whether a file
 1588 name (as returned from, for instance, 'file-name-all-completions') is
 1589 a directory file name.  It returns non-nil if the last character in
 1590 the name is a directory separator character (forward slash on GNU and
 1591 Unix systems, forward- or backslash on MS-Windows and MS-DOS).
 1592 
 1593 ** ASCII approximations to curved quotes are put in 'standard-display-table'
 1594 if the terminal cannot display curved quotes.
 1595 
 1596 ** Standard output and error streams now transliterate characters via
 1597 'standard-display-table', and encode output using 'locale-coding-system'.
 1598 To force a specific encoding, bind 'coding-system-for-write' to the
 1599 coding-system of your choice when invoking functions like 'prin1' and
 1600 'message'.
 1601 
 1602 ** New var 'truncate-string-ellipsis' to choose how to indicate truncation.
 1603 
 1604 ** New possible value for 'system-type': 'nacl'.
 1605 This is used by Google's Native Client (NaCl).
 1606 
 1607 ** Miscellaneous name change
 1608 
 1609 For consistency with the usual Emacs spelling, the Lisp variable
 1610 'hfy-optimisations' has been renamed to 'hfy-optimizations'.
 1611 The old name should still work, as an obsolescent alias.
 1612 
 1613 ** Changes in Frame- and Window- Handling
 1614 
 1615 *** Emacs can now draw horizontal scroll bars on some platforms that
 1616 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
 1617 Horizontal scroll bars are turned off by default.
 1618 
 1619 **** New function 'horizontal-scroll-bars-available-p' telling whether
 1620 horizontal scroll bars are available on the underlying system.
 1621 
 1622 **** New mode 'horizontal-scroll-bar-mode' to toggle horizontal scroll
 1623 bars on all existing and future frames.
 1624 
 1625 **** New function 'toggle-horizontal-scroll-bar' to toggle horizontal
 1626 scroll bars on the selected frame.
 1627 
 1628 **** New frame parameters 'horizontal-scroll-bars' and
 1629 'scroll-bar-height' to set horizontal scroll bars and their height
 1630 for individual frames and in 'default-frame-alist'.
 1631 
 1632 ***** The 'horizontal-scroll-bars' parameter was already present and non-nil
 1633 by default in Emacs 24 and before (although it didn't have any
 1634 effect).  This could cause a problem if you share your desktop files
 1635 with older versions of Emacs: saving desktop in Emacs before v25.1,
 1636 then restoring it in v25.1 would turn on horizontal scroll bars in all
 1637 buffers.  To resolve this issue, put this in your ~/.emacs init file:
 1638 
 1639   (modify-all-frames-parameters '((horizontal-scroll-bars . nil)))
 1640 
 1641 **** New functions 'frame-scroll-bar-height' and
 1642 'window-scroll-bar-height' return the height of horizontal scroll
 1643 bars on a specific frame or window.
 1644 
 1645 **** 'set-window-scroll-bars' now accepts five parameters where the last
 1646 two specify height and type of the window's horizontal scroll bar.
 1647 
 1648 **** 'window-scroll-bars' now returns type and sizes of horizontal scroll
 1649 bars too.
 1650 
 1651 **** New buffer-local variables 'horizontal-scroll-bar' and
 1652 'scroll-bar-height'.
 1653 
 1654 *** New functions 'frame-geometry' and 'frame-edges' give access to a
 1655 frame's geometry.
 1656 
 1657 *** New functions 'mouse-absolute-pixel-position' and
 1658 'set-mouse-absolute-pixel-position' get/set screen coordinates of the
 1659 mouse cursor.
 1660 
 1661 *** The function 'window-edges' now accepts three additional arguments to
 1662 retrieve body, absolute and pixel edges of the window.
 1663 
 1664 *** The functions 'window-inside-edges', 'window-inside-pixel-edges' and
 1665 'window-inside-absolute-pixel-edges' have been renamed to respectively
 1666 'window-body-edges', 'window-body-pixel-edges' and
 1667 'window-absolute-body-pixel-edges'.  The old names are kept as aliases.
 1668 
 1669 *** New function 'window-absolute-pixel-position' to get the screen
 1670 coordinates of a visible buffer position.
 1671 
 1672 *** The height of a frame's menu and tool bar are no longer counted in the
 1673 frame's text height.  This means that the text height stands only for
 1674 the height of the frame's root window plus that of the echo area (if
 1675 present).  This was already the behavior for frames with external tool
 1676 and menu bars (like in the Gtk builds) but has now been extended to all
 1677 builds.
 1678 
 1679 *** Frames now do not necessarily preserve the number of columns or lines
 1680 they display when setting default font, menu bar, fringe width, or
 1681 scroll bars.  In particular, maximized and fullscreen frames are
 1682 conceptually never resized if such settings change.  For fullheight and
 1683 fullwidth frames, the behavior may depend on the toolkit used.
 1684 
 1685 **** New option 'frame-inhibit-implied-resize' if non-nil, means that
 1686 setting default font, menu bar, fringe width, or scroll bars of a
 1687 specific frame does not resize that frame in order to preserve the
 1688 number of columns or lines it displays.
 1689 
 1690 *** New function 'window-preserve-size' allows you to preserve the size of
 1691 a window without "fixing" it.  It's supported by 'fit-window-to-buffer',
 1692 'temp-buffer-resize-mode' and 'display-buffer'.
 1693 
 1694 *** New 'display-buffer' action function 'display-buffer-use-some-frame'.
 1695 This displays the buffer in an existing frame other than the current
 1696 frame, and allows the caller to specify a frame predicate to exclude
 1697 frames.
 1698 
 1699 *** New minor mode 'window-divider-mode' and options
 1700 'window-divider-default-places', 'window-divider-default-bottom-width'
 1701 and 'window-divider-default-right-width'.
 1702 
 1703 *** When a window is shrunk horizontally its margins are no longer removed
 1704 automatically.  Rather, Emacs refuses to split or resize windows when
 1705 this would cause margins to no longer fit into the width reserved for the
 1706 corresponding window.  An application can override this behavior for a
 1707 particular window by setting that window's 'min-margins' parameter.  As
 1708 a consequence, the application becomes fully responsible for trimming
 1709 the margin sizes of that window and any window inheriting these margins.
 1710 
 1711 *** The window displaying the '*Completions*' buffer with minibuffer
 1712 completion candidates is now shown at the bottom of the selected
 1713 frame.  The size of that window is always as large as required to
 1714 display all the candidates, except when limited by the minimum size
 1715 of the other windows on that frame; those other windows are resized
 1716 to provide space for the '*Completions*' display.  The Emacs manual
 1717 describes how to customize 'display-buffer-alist' to get back the old
 1718 behavior, see the node "Temporary Displays" there.
 1719 
 1720 ** Tearoff menus and detachable toolbars for Gtk+ have been removed.
 1721 Those features have been deprecated in Gtk+ for a long time.
 1722 
 1723 ** Etags
 1724 
 1725 *** etags no longer qualifies class members by default.
 1726 
 1727 By default, 'etags' will not qualify class members for Perl and C-like
 1728 object-oriented languages with their class names and namespaces, and
 1729 will remove qualifications used explicitly in the code from the tag
 1730 names it puts in TAGS files.  This is so the etags.el back-end for
 1731 'xref-find-definitions' is more accurate and produces less false
 1732 positives.
 1733 
 1734 Use --class-qualify (-Q) if you want the old default behavior of
 1735 qualifying class members in C++, Java, Objective C, and Perl.  Note
 1736 that using -Q might make some class members become "unknown" to 'M-.'
 1737 ('xref-find-definitions'); if so, you can use 'C-u M-.' to specify the
 1738 qualified names by hand.
 1739 
 1740 *** New language Ruby
 1741 
 1742 Names of modules, classes, methods, functions, and constants are
 1743 tagged.  Overloaded operators are also tagged.
 1744 
 1745 *** New language Go
 1746 Names of packages, functions, and types are tagged.
 1747 
 1748 *** Improved support for Lua
 1749 
 1750 Etags now tags functions even if the "function" keyword follows some
 1751 whitespace at line beginning.
 1752 
 1753 
 1754 * Changes in Emacs 25.1 on Non-Free Operating Systems
 1755 
 1756 ** MS-Windows specific Emacs build scripts are no longer in the distribution.
 1757 This includes the makefile.w32-in files in various subdirectories, and
 1758 the support files.  The file nt/configure.bat now just tells the user
 1759 to use the procedure described in nt/INSTALL, by running the Posix
 1760 'configure' script in the top-level directory.
 1761 
 1762 ** Building Emacs for MS-Windows requires at least Windows XP
 1763 or Windows Server 2003.  The built binaries still run on all versions
 1764 of Windows starting with Windows 9X.
 1765 
 1766 ** Emacs running on MS-Windows now supports the daemon mode.
 1767 
 1768 ** The byte counts in etags-generated TAGS files are now the same on
 1769 MS-Windows as they are on other platforms.
 1770 
 1771 ** On macOS, configure creates a Cocoa ("Nextstep") build by default.
 1772 Pass '--without-ns' to configure to create an X11 build, the old default.
 1773 
 1774 ** Mac OS X 10.5 or older is no longer supported.
 1775 
 1776 ** Mac OS X on PowerPC is no longer supported.
 1777 
 1778 ** New variable 'ns-use-fullscreen-animation' controls animation for
 1779 non-native NS fullscreen.  The default is nil.  Set to t to enable
 1780 animation when entering and leaving fullscreen.  For native macOS
 1781 fullscreen this has no effect.
 1782 
 1783 ** On the macOS Cocoa ("Nextstep") port, multicolor font (such as color
 1784 emoji) display is disabled.  This feature was accidentally added when
 1785 Emacs 24.4 included the new Core Text based font backend code that was
 1786 originally implemented for a non-mainline port.  This will be enabled
 1787 again once it is also implemented in Emacs on free operating systems.
 1788 If some symbols, such as emoji, do not display, we suggest to install
 1789 an appropriate font, such as Symbola; then they will be displayed,
 1790 albeit without the color effects.
 1791 
 1792 ** The new function 'w32-application-type' returns the type of an
 1793 MS-Windows application given the name of its executable program file.
 1794 
 1795 ** New variable 'w32-pipe-buffer-size'.
 1796 It can be used to tune the size of the buffer of pipes created for
 1797 communicating with subprocesses, when the program run by a subprocess
 1798 exhibits unusual buffering behavior.  Default is zero, which lets the
 1799 OS use its default size.
 1800 
 1801 
 1802 ----------------------------------------------------------------------
 1803 This file is part of GNU Emacs.
 1804 
 1805 GNU Emacs is free software: you can redistribute it and/or modify
 1806 it under the terms of the GNU General Public License as published by
 1807 the Free Software Foundation, either version 3 of the License, or
 1808 (at your option) any later version.
 1809 
 1810 GNU Emacs is distributed in the hope that it will be useful,
 1811 but WITHOUT ANY WARRANTY; without even the implied warranty of
 1812 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 1813 GNU General Public License for more details.
 1814 
 1815 You should have received a copy of the GNU General Public License
 1816 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
 1817 
 1818 
 1819 Local variables:
 1820 coding: us-ascii
 1821 mode: outline
 1822 paragraph-separate: "[ 	]*$"
 1823 end: