1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2015 Free Software Foundation, Inc.
4 See the end of the file for license conditions.
6 Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
7 If possible, use M-x report-emacs-bug.
9 This file is about changes in Emacs version 25.
11 See files NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20, NEWS.19, NEWS.18,
12 and NEWS.1-17 for changes in older Emacs versions.
14 You can narrow news to a specific version by calling `view-emacs-news'
15 with a prefix argument or by typing C-u C-h C-n.
18 +++ indicates that all necessary documentation updates are complete.
19 (This means all relevant manuals in doc/ AND lisp doc-strings.)
20 --- means no change in the manuals is needed.
21 When you add a new item, use the appropriate mark if you are sure it applies,
22 otherwise leave it unmarked.
25 * Installation Changes in Emacs 25.1
28 ** Building Emacs now requires C99 or later.
30 ** Building Emacs now requires GNU make, version 3.81 or later.
32 ** By default, Emacs no longer works on IRIX. We expect that Emacs
33 users are not affected by this, as SGI stopped supporting IRIX in
34 December 2013. If you are affected, please send a bug report. You
35 should be able to work around the problem either by porting the Emacs
36 undumping code to GCC under IRIX, or by configuring --with-wide-int,
37 or by sticking with Emacs 24.4.
39 ** 'configure' now prefers gnustep-config when configuring GNUstep.
40 If gnustep-config is not available, the old heuristics are used.
43 ** The configure option `--with-pkg-config-prog' has been removed.
44 Use './configure PKG_CONFIG=/full/name/of/pkg-config' if you need to.
46 ** The configure option '--enable-silent-rules' is now the default,
47 and silent rules are now quieter. To get the old behavior where
48 'make' chatters a lot, configure with '--disable-silent-rules' or
49 build with 'make V=1'.
52 ** The configure option '--with-gameuser' now allows to specify a
53 group instead of a user if its argument is prefixed by ':' (a colon).
54 This will cause the game score files in ${localstatedir}/games/emacs
55 to be owned by that group, and the helper program for updating them to
56 be installed setgid. The option now defaults to the 'games' group.
59 ** The `grep-changelog' script (and its manual page) are no longer included.
60 It has no particular connection to Emacs and has not changed in years,
61 so if you want to use it, you can always take a copy from an older Emacs.
64 * Startup Changes in Emacs 25.1
67 * Changes in Emacs 25.1
69 ** New command `comment-line' bound to `C-x C-;'.
71 ** New function `custom-prompt-customize-unsaved-options' checks for
72 unsaved customizations and prompts user to customize (if found).
75 ** Network security (TLS/SSL certificate validity and the like) is
76 added via the new Network Security Manager (NSM) and controlled via
77 the `network-security-level' variable.
79 ** C-h l now also lists the commands that were run.
82 ** The new M-s M-w key binding uses eww to search the web for the
85 ** M-x suggests shorthands and ignores obsolete commands for completion.
86 ** x-select-enable-clipboard is renamed select-enable-clipboard.
87 x-select-enable-primary and renamed select-enable-primary.
88 Additionally they both now apply to all systems (OSX, GNUstep, Windows, you
89 name it), with the proviso that on some systems (e.g. Windows)
90 select-enable-primary is ineffective since the system doesn't
91 have the equivalent of a primary selection.
94 ** terpri gets an optional arg ENSURE to conditionally output a newline.
97 ** New macro `define-advice'.
99 ** `insert-register' now leaves point after the inserted text
100 when called interactively. A prefix argument toggles this behavior.
102 ** New var `truncate-string-ellipsis' to choose how to indicate truncation.
105 ** The new variable `term-file-aliases' replaces some files from lisp/term.
106 The function `tty-run-terminal-initialization' consults this variable
107 when deciding what terminal-specific initialization code to run.
110 ** New variable `system-configuration-features', listing some of the
111 main features that Emacs was compiled with. This is mainly intended
112 for use in Emacs bug reports.
115 ** A password is now hidden also when typed in batch mode. Another
116 hiding character but the default `.' can be used by let-binding the
117 variable `read-hide-char'.
119 ** The new functions `string-collate-lessp' and `string-collate-equalp'
120 preserve the collation order as defined by the system's locale(1)
121 environment. For the time being this is implemented for modern POSIX
122 systems and for MS-Windows, for other systems they fall back to their
123 counterparts `string-lessp' and `string-equal'.
125 *** The ls-lisp package uses `string-collate-lessp' to sort file names.
126 If you want the old, locale-independent sorting, customize the new
127 option `ls-lisp-use-string-collate' to a nil value.
129 *** The MS-Windows specific variable `w32-collate-ignore-punctuation',
130 if set to a non-nil value, causes the above 2 functions to ignore
131 symbol and punctuation characters when collating strings. This
132 emulates the behavior of modern Posix platforms when the locale's
133 codeset is "UTF-8" (as in "en_US.UTF-8"). This is needed because
134 MS-Windows doesn't support UTF-8 as codeset in its locales.
137 ** The new function `bidi-find-overridden-directionality' allows to
138 find characters whose directionality was, perhaps maliciously,
139 overridden by directional override control characters. Lisp programs
140 can use this to detect potential phishing of URLs and other links that
141 exploits bidirectional display reordering.
144 ** The new function `buffer-substring-with-bidi-context' allows to
145 copy a portion of a buffer into a different location while preserving
146 the visual appearance both of the copied text and the text at
147 destination, even when the copied text includes mixed bidirectional
148 text and directional control characters.
150 ** New variable `ns-use-fullscreen-animation' controls animation for
151 non-native NS fullscreen. The default is nil. Set to t to enable
152 animation when entering and leaving fullscreen. For native OSX fullscreen
155 ** A new text property `inhibit-read-only' can be used in read-only
156 buffers to allow certain parts of the text to be writable.
158 ** A new function `directory-files-recursively' returns all matching
159 files (recursively) under a directory.
161 ** The new `directory-name-p' can be used to check whether a file
162 name (as returned from, for instance, `file-name-all-completions' is
163 a directory file name. It returns non-nil if the last character in
164 the name is a forward slash.
167 ** New variable `fast-but-imprecise-scrolling' inhibits
168 fontification during full screen scrolling operations, giving less
169 hesitant operation during auto-repeat of C-v, M-v at the cost of
170 possible inaccuracies in the end position.
172 ** The function `font-info' now returns more details about a font.
173 In particular, it now returns the average width of the font's
174 characters, which can be used for geometry-related calculations.
176 ** A new function `default-font-width' returns the average width of a
177 character in the current buffer's default font. If the default face
178 is remapped (see `face-remapping-alist'), the value for the remapped
179 face is returned. This function complements the existing function
180 `default-font-height'.
182 ** New functions `window-font-height' and `window-font-width' return
183 the height and average width of characters in a specified face and
184 window. If FACE is remapped (see `face-remapping-alist'), the
185 function returns the information for the remapped face.
187 ** A new function `window-max-chars-per-line' returns the maximal
188 number of characters that can be displayed on one line. If a face
189 and/or window are provided, these values are used for the
190 calculation. This function is different from `window-body-width' in
191 that it accounts for (i) continuation glyphs, (ii) the size of the
192 font, and (iii) the specified window.
195 * Editing Changes in Emacs 25.1
197 ** Unicode names entered via C-x 8 RET now use substring completion by default.
199 ** New minor mode global-eldoc-mode is enabled by default.
201 ** Emacs now supports "bracketed paste mode" when running on a terminal
202 that supports it. This facility allows Emacs to understand pasted
203 chunks of text as strings to be inserted, instead of interpreting each
204 character in the pasted text as actual user input. This results in a
205 paste experience similar to that under a window system, and significant
206 performance improvements when pasting large amounts of text.
208 ** Emacs now supports the latest version of the UBA.
209 The Emacs implementation of the Unicode Bidirectional Algorithm (UBA)
210 was updated to support all the latest additions and changes introduced
211 in Unicode Standard versions 6.3 and 7.0, and a few changes suggested
212 for Unicode 8.0. This includes full support for directional isolates
213 and the Bidirectional Parentheses Algorithm (BPA) specified by these
216 ** You can access `mouse-buffer-menu' (C-down-mouse-1) using C-f10.
219 ** New buffer-local `electric-pair-local-mode'.
222 * Changes in Specialized Modes and Packages in Emacs 25.1
223 ** xterm-mouse-mode now supports mouse-tracking (if your xterm supports it).
226 *** `package-install-from-buffer' and `package-install-file' work on directories.
227 This follows the same rules as installing from a .tar file, except the
228 -pkg file is optional.
230 *** Packages which are dependencies of other packages cannot be deleted.
231 The FORCE argument to `package-delete' overrides this.
233 *** New custom variable `package-selected-packages' tracks packages
234 which were installed by the user (as opposed to installed as
235 dependencies). This variable can also be manually customized.
237 *** New command `package-install-user-selected-packages' installs all
238 packages from `package-selected-packages' which are currently missing.
240 *** New command `package-autoremove' removes all packages which were
241 installed strictly as dependencies but are no longer needed.
245 When you invoke `shell' interactively, the *shell* buffer will now
246 display in a new window. However, you can customize this behavior via
247 the `display-buffer-alist' variable. For example, to get
248 the old behavior -- *shell* buffer displays in current window -- use
249 (add-to-list 'display-buffer-alist
250 '("^\\*shell\\*$" . (display-buffer-same-window))).
254 *** The `:protection' slot option is not obeyed any more.
255 *** The `newname' argument to constructors is optional&deprecated.
256 If you need your objects to be named, do it by inheriting from `eieio-named'.
257 *** The <class>-list-p and <class>-child-p functions are declared obsolete.
258 *** The <class> variables are declared obsolete.
259 *** The <initarg> variables are declared obsolete.
260 *** defgeneric and defmethod are declared obsolete.
261 *** `constructor' is now an obsolete alias for `make-instance'.
264 *** New command `ido-bury-buffer-at-head' bound to C-S-b
265 Bury the buffer at the head of `ido-matches', analogous to how C-k
266 kills the buffer at head.
270 *** You can use <up> and <down> keys to move point in the multi-line
271 minibuffer just as in an ordinary buffer. Only when point moves over
272 the bottom/top of the minibuffer it goes to the next/previous history
273 element. The new commands bound to <up> and <down> in the minibuffer:
274 `next-line-or-history-element' and `previous-line-or-history-element'.
276 ** Search and Replace
278 *** Query-replace history is enhanced.
279 When query-replace reads the FROM string from the minibuffer, typing
280 `M-p' will now show previous replacements as "FROM SEP TO", where FROM
281 and TO are the original text and its replacement, and SEP is an arrow
282 string defined by the new variable `query-replace-from-to-separator'.
283 To select a prior replacement, type `M-p' until the desired
284 replacement appears in the minibuffer, and then exit the minibuffer by
289 *** If `quick-calc' is called with a prefix argument, insert the
290 result of the calculation into the current buffer.
293 *** New minor mode `global-eldoc-mode'
294 *** `eldoc-documentation-function' now defaults to `ignore'
295 *** `describe-char-eldoc' displays information about character at point,
296 and can be used as a default value of `eldoc-documentation-function'. It is
297 useful when, for example, one needs to distinguish various spaces (e.g. ]Â [,
298 ] [, ] [, etc.) while using mono-spaced font.
303 *** HTML can now be rendered using variable-width fonts.
306 *** A new command `F' (`eww-toggle-fonts') can be used to toggle
307 whether to use variable-pitch fonts or not. The user can also
308 customize the `shr-use-fonts' variable.
311 *** A new command `R' (`eww-readable') will try do identify the main
312 textual parts of a web page and display only that, leaving menus and
313 the like off the page.
316 *** You can now use several eww buffers in parallel by renaming eww
317 buffers you want to keep separate.
320 *** Partial state of the eww buffers (the URIs and the titles of the
321 pages visited) is now preserved in the desktop file.
324 *** `eww-after-render-hook' is now called after eww has rendered
325 the data in the buffer.
328 *** The `eww-reload' command now takes a prefix to not reload via
329 the net, but just use the local copy of the HTML.
332 *** The DOM shr and eww uses has been changed to the general Emacs
333 xml.el/libxml2 DOM, and a new package dom.el has been added to
334 interact with this DOM. See the Emacs Lisp manual for interface
338 *** `mailcap-mime-data' is now consulted when displaying PDF files.
341 *** The new `S' command will list all eww buffers, and allow managing
345 *** https pages with valid certificates have headers marked in green, while
346 invalid certificates are marked in red.
350 *** text/html messages that contain inline image parts will be
351 transformed into multipart/related messages before sending.
354 *** New UPatterns `quote', `app', `cl-struct', and `eieio'.
355 *** New UPatterns can be defined with `pcase-defmacro'.
357 *** New vector QPattern.
360 *** Strings after `:documentation' are highlighted as docstrings.
363 *** Rectangle Mark mode can have corners past EOL or in the middle of a TAB.
364 *** C-x C-x in rectangle-mark-mode now cycles through the four corners.
365 *** `string-rectangle' provides on-the-fly preview of the result.
367 ** New font-lock functions font-lock-ensure and font-lock-flush, which
368 should be used instead of font-lock-fontify-buffer when called from Elisp.
370 ** Macro `minibuffer-with-setup-hook' takes (:append FUN) to mean
371 appending FUN to `minibuffer-setup-hook'.
374 *** New functions cl-fresh-line, cl-digit-char-p and cl-parse-integer.
378 The seq library adds sequence manipulation functions and macros that
379 complement basic functions provided by subr.el. All functions are
380 prefixed with `seq-' and work on lists, strings and vectors.
382 ** Calendar and diary
385 *** New commands to insert diary entries with Chinese dates:
386 `diary-chinese-insert-anniversary-entry' `diary-chinese-insert-entry'
387 `diary-chinese-insert-monthly-entry', `diary-chinese-insert-yearly-entry'.
390 *** The calendar can now list and mark diary entries with Chinese dates.
391 See `diary-chinese-list-entries' and `diary-chinese-mark-entries'.
394 *** The option `calendar-mode-line-format' can now be nil,
395 which means to do nothing special with the mode line in calendars.
398 *** Many items obsolete since at least version 23.1 have been removed.
399 The majority were function/variable/face aliases, too numerous to list here.
402 **** Functions `calendar-one-frame-setup', `calendar-only-one-frame-setup',
403 `calendar-two-frame-setup', `european-calendar', `american-calendar'.
405 **** Hooks `cal-menu-load-hook', `cal-x-load-hook'.
407 **** Macro `calendar-for-loop'.
409 **** Variables `european-calendar-style', `diary-face', `hebrew-holidays-{1,4}'.
411 **** The nil and list forms of `diary-display-function'.
413 ** New ERT function `ert-summarize-tests-batch-and-exit'.
415 ** New js.el option `js-indent-first-init'.
418 ** `Info-fontify-maximum-menu-size' can be t for no limit.
421 ** `info-display-manual' can now be given a prefix argument which (any
422 non-nil value) directs the command to limit the completion
423 alternatives to currently visited manuals.
426 ** ntlm.el has support for NTLM2.
429 ** The Rmail commands d, C-d and u now handle repeat counts to delete or
430 undelete multiple messages.
432 ** Rmail can now render HTML mail messages if your Emacs was built with
433 libxml2 or if you have the Lynx browser installed. By default, Rmail
434 will display the HTML version of a mail message that has both HTML and
435 plain text parts, if display of HTML email is possible; customize the
436 `rmail-mime-prefer-html' option to `nil' if you don't want that.
438 ** SES now supports local printer functions; see `ses-define-local-printer'.
440 ** In sh-mode, you can now use `sh-shell' as a file-local variable to
441 specify the type of shell in use (bash, csh, etc).
445 *** Fatal TLS errors are now silent by default.
449 *** The URL package accepts now the protocols "ssh", "scp" and "rsync".
450 When `url-handler-mode' is enabled, file operations for these
451 protocols as well as for "telnet" and "ftp" are passed to Tramp.
453 *** The URL package allows customizing the `url-user-agent' string.
454 The new `url-user-agent' variable can be customized to be a string or
457 *** The new interface variable `url-request-noninteractive' can be used
458 to specify that we're running in a noninteractive context, and that
459 we should not be queried about things like TLS certificate validity.
461 *** If URL is used with a https connection, the first callback argument
462 plist will contain a :peer element that has the output of
463 `gnutls-peer-status' (if Emacs is built with GnuTLS support).
467 *** New connection method "nc", which allows to access dumb busyboxes.
471 *** New user variable `sql-default-directory' enables remote
472 connections using Tramp.
474 *** New command `sql-send-line-and-next' sends the current line to the
475 interactive buffer and advances to the next line, skipping whitespace
478 *** Add support for Vertica SQL.
480 ** VC and related modes
482 *** The new command vc-region-history shows the log+diff of the active region.
484 *** New option `vc-annotate-background-mode' controls whether
485 the color range from `vc-annotate-color-map' is applied to the
486 background or to the foreground.
488 *** `compare-windows' now compares text with the most recently used window
489 instead of the next window. The new option `compare-windows-get-window-function'
490 allows to customize this.
492 *** Two new faces `compare-windows-removed' and `compare-windows-added'
493 replace the obsolete face `compare-windows'.
495 ** VHDL mode supports VHDL'08.
497 ** Calculator: decimal display mode uses "," groups, so it's more
498 fitting for use in money calculations; factorial works with
501 ** HideIfDef mode now support full C/C++ expressions, argumented macro expansions
502 , interactive macro evaluation and automatic scanning of #defined symbols.
504 *** New custom variable `hide-ifdef-header-regexp' to define C/C++ header file
505 name patterns. Default case-insensitive .h, .hh, .hpp and .hxx.
506 *** New custom variable `hide-ifdef-expand-reinclusion-protection' to prevent
507 reinclusion protected header files from being fully hidden.
508 *** New custom variable `hide-ifdef-exclude-define-regexp' to define symbol
509 name patterns (e.x. all "FOR_DOXYGEN_ONLY_*") to be excluded.
513 *** New custom variable `tex-print-file-extension' to help users who
514 use PDF instead of DVI.
516 ** whitespace-mode: new 'big-indent style highlighting too much indentation.
517 By default, 32 spaces and four TABs are considered to be too much but
518 `whitespace-big-indent-regexp' can be configured to change that.
520 ** tildify: `tildify-space-string', `tildify-pattern', and
521 `tildify-foreach-region-function' variables added making
522 `tildify-string-alist', `tildify-pattern-alist', and
523 `tildify-ignored-environments-alist' variables (as well as a few
524 helper functions) obsolete.
527 The new package provides generic framework and new commands to find
528 and move to definitions, as well as pop back to the original location.
531 `xref-find-definitions' replaces `find-tag' and provides an interface
532 to pick one destination among several. Hence, `tags-loop-continue' is
533 unbound. `xref-pop-marker-stack' replaces `pop-tag-mark', but uses an
534 easier binding, which is now unoccupied (`M-,').
535 `xref-find-definitions-other-window' replaces `find-tag-other-window'.
536 `xref-find-definitions-other-frame' replaces `find-tag-other-frame'.
537 `xref-find-apropos' replaces `find-tag-regexp'.
540 `find-tag-marker-ring-length' is now an obsolete alias for
541 `xref-marker-ring-length'. `find-tag-marker-ring' is now an obsolete
542 alias for a private variable. `xref-push-marker-stack' and
543 `xref-pop-marker-stack' should be used to mutate it instead.
546 As a result of the above, these commands are now obsolete:
547 `find-tag-other-window', `find-tag-other-frame', `find-tag-regexp',
548 `tags-apropos' and `tags-loop-continue'.
551 EUDC's LDAP backend has been improved.
553 *** EUDC supports LDAP-over-SSL URLs (ldaps://).
555 *** EUDC passes LDAP passwords through a pipe to the ldapsearch
556 subprocess instead of on the command line.
558 *** EUDC handles LDAP wildcards automatically so the user shouldn't
559 need to configure this manually anymore.
561 *** The LDAP configuration section of EUDC's manual has been
564 There have also been customization changes.
566 *** New custom variable `eudc-server-hotlist' to allow specifying
567 multiple EUDC servers in init file.
569 *** Custom variable `eudc-inline-query-format' defaults to completing
570 on email and firstname instead of surname.
572 *** Custom variable `eudc-expansion-overwrites-query' defaults to nil
573 to avoid interfering with the kill ring.
575 *** Custom variable `eudc-inline-expansion-format' defaults to
576 "Firstname Surname <mail-address>".
578 *** New custom variable `ldap-ldapsearch-password-prompt-regexp' to
579 allow overriding the regular expression that recognizes the ldapsearch
580 command line's password prompt.
584 *** The new built-in command `clear' can scroll window contents out of sight.
588 *** Support for the Conkeror web browser.
591 *** Support for several ancient browsers is now officially obsolete.
594 ** tar-mode: new `tar-new-entry' command, allowing for new members to
595 be added to the archive.
597 ** Autorevert: dired buffers are also auto-reverted via file
598 notifications, if Emacs is compiled with file notification support.
606 * New Modes and Packages in Emacs 25.1
608 ** cl-generic.el provides CLOS-style multiple-dispatch generic functions.
610 ** scss-mode (a minor variant of css-mode)
612 ** let-alist is a new macro (and a package) that allows one to easily
613 let-bind the values stored in an alist.
615 ** `tildify-mode' allows to automatically insert hard spaces as one
616 types the text. Breaking line after a single-character words is
617 forbidden by Czech and Polish typography (and may be discouraged in
618 other languages), so `auto-tildify-mode' makes it easier to create
619 a typographically-correct documents.
621 * Incompatible Lisp Changes in Emacs 25.1
623 ** `save-excursion' does not save&restore the mark any more.
625 ** read-buffer-function can now be called with a 4th argument (`predicate').
627 ** completion-table-dynamic stays in the minibuffer.
628 If you want the old behavior of calling the function in the buffer
629 from which the minibuffer was entered, call it with the new argument
632 ** window-configurations no longer record the buffers's marks.
634 ** inhibit-modification-hooks now also inhibits lock-file checks, as well as
635 active region handling.
637 ** deactivate-mark is now buffer-local.
639 ** `cl-the' now asserts that its argument is of the given type.
641 ** `process-running-child-p` may now return a numeric process
642 group ID instead of `t'.
645 ** Mouse click events on mode line or header line no longer include
646 any reference to a buffer position. The 6th member of the mouse
647 position list returned for such events is now nil.
649 ** Menu items in keymaps do not support the "key shortcut cache" any more.
650 These slots used to hold key-shortcut data, but have been obsolete since
653 ** Emacs no longer downcases the first letter of a system diagnostic
654 when signaling a file error. For example, it now reports "Permission
655 denied" instead of "permission denied". The old behavior was problematic
656 in languages like German where downcasing rules depend on grammar.
659 ** The character classes [:alpha:] and [:alnum:] in regular expressions
660 now match multibyte characters using Unicode character properties.
661 If you want the old behavior where they matched any character with
662 word syntax, use `\sw' instead.
665 * Lisp Changes in Emacs 25.1
667 ** New function `make-process' provides an alternative interface to
668 `start-process'. It allows programs to set process parameters such as
669 process filter, sentinel, etc., through keyword arguments (similar to
670 `make-network-process').
672 ** `read-buffer' takes a new `predicate' argument.
674 ** Emacs Lisp now supports generators.
676 ** New finalizer facility for running code when objects
679 ** lexical closures can use (:documentation <form>) to build their docstring.
680 It should be placed right where the docstring would be, and <form> is then
681 evaluated (and should return a string) when the closure is built.
683 ** define-inline provides a new way to define inlinable functions.
685 ** New function macroexpand-1 to perform a single step of macroexpansion.
687 ** Some "x-*" were obsoleted:
688 *** x-select-text is renamed gui-select-text.
689 *** x-selection-value is renamed gui-selection-value.
690 *** x-get-selection is renamed gui-get-selection.
691 *** x-get-clipboard and x-clipboard-yank are marked obsolete.
692 *** x-get-selection-value is renamed to gui-get-primary-selection.
693 *** x-set-selection is renamed to gui-set-selection
695 ** New function `alist-get', which is also a valid place (aka lvalue).
697 ** New function `funcall-interactively', which works like `funcall'
698 but makes `called-interactively-p' treat the function as (you guessed it)
699 called interactively.
701 ** New function `function-put' to use instead of `put' for function properties.
704 ** New properties that can be specified with `declare':
705 *** (interactive-only INSTEAD), says to use INSTEAD for non-interactive use.
706 *** (pure VAL), if VAL is non-nil, indicates the function is pure.
707 *** (side-effect-free VAL), if VAL is non-nil, indicates the function does not
711 ** New macro `with-file-modes', for evaluating expressions with default file
712 permissions set to temporary values (e.g., for creating private files).
714 ** You can access the slots of structures using `cl-struct-slot-value'.
716 ** Functions `rmail-delete-forward' and `rmail-delete-backward' take an
717 optional repeat-count argument.
719 ** Function `sort' can deal with vectors.
721 ** Function `system-name' now returns an updated value if the current
722 system's name has changed or if the Emacs process has changed systems,
723 and to avoid long waits it no longer consults DNS to canonicalize the
724 name. The variable `system-name' is now obsolete.
727 ** Function `write-region' no longer outputs "Wrote FILE" in batch mode.
730 ** New utilities in subr-x.el:
731 *** New macros `if-let' and `when-let' allow defining bindings and to
732 execute code depending whether all values are true.
733 *** New macros `thread-first' and `thread-last' allow threading a form
734 as the first or last argument of subsequent forms.
737 ** Time-related changes:
739 *** Time-related functions now consistently accept numbers
740 (representing seconds since the epoch) and nil (representing the
741 current time) as well as the usual list-of-integer representation.
742 Affected functions include `current-time-string', `current-time-zone',
743 `decode-time', `float-time', `format-time-string', `seconds-to-time',
744 `time-add', `time-less-p', `time-subtract', `time-to-day-in-year',
745 `time-to-days', and `time-to-seconds'.
747 *** The `encode-time-value' and `with-decoded-time-value' macros have
750 *** `calendar-next-time-zone-transition', `time-add', and
751 `time-subtract' no longer return time values in the obsolete and
752 undocumented integer-pair format. Instead, they return a list of two
756 ** New function `set-binary-mode' allows to switch a standard stream
757 of the Emacs process to binary I/O mode.
760 * Changes in Frames and Windows Code in Emacs 25.1
763 ** Emacs can now draw horizontal scroll bars on some platforms that
764 provide toolkit scroll bars, namely Gtk+, Lucid, Motif and Windows.
765 Horizontal scroll bars are turned off by default.
766 *** New function `horizontal-scroll-bars-available-p' telling whether
767 horizontal scroll bars are available on the underlying system.
768 *** New mode `horizontal-scroll-bar-mode' to toggle horizontal scroll
769 bars on all existing and future frames.
770 *** New function `toggle-horizontal-scroll-bar' to toggle horizontal
771 scroll bars on the selected frame.
772 *** New frame parameters `horizontal-scroll-bars' and
773 `scroll-bar-height' to set horizontal scroll bars and their height
774 for individual frames and in `default-frame-alist'.
775 *** New functions `frame-scroll-bar-height' and
776 `window-scroll-bar-height' return the height of horizontal scroll
777 bars on a specific frame or window.
778 *** `set-window-scroll-bars' now accepts five parameters where the last
779 two specify height and type of the window's horizontal scroll bar.
780 *** `window-scroll-bars' now returns type and sizes of horizontal scroll
782 *** New buffer-local variables `horizontal-scroll-bar' and
786 ** The height of a frame's menu and tool bar are no longer counted in the
787 frame's text height. This means that the text height stands only for
788 the height of the frame's root window plus that of the echo area (if
789 present). This was already the behavior for frames with external tool
790 and menu bars (like in the Gtk builds) but has now been extended to all
794 ** Frames now do not necessarily preserve the number of columns or lines
795 they display when setting default font, menu bar, fringe width, or
796 scroll bars. In particular, maximized and fullscreen frames are
797 conceptually never resized if such settings change. For fullheight and
798 fullwidth frames, the behavior may depend on the toolkit used.
799 *** New option `frame-inhibit-implied-resize' if non-nil, means that
800 setting default font, menu bar, fringe width, or scroll bars of a
801 specific frame does not resize that frame in order to preserve the
802 number of columns or lines it displays.
805 ** New function `window-preserve-size' allows to preserve the size of
806 windows without "fixing" it. It's supported by `fit-window-to-buffer',
807 `temp-buffer-resize-mode' and `display-buffer'.
809 ** Tearoff menus and detachable toolbars for Gtk+ has been removed.
810 Those features have been deprecated in Gtk+ for a long time.
813 * Changes in Emacs 25.1 on Non-Free Operating Systems
816 ** Building Emacs for MS-Windows requires at least Windows XP
817 or Windows Server 2003. The built binaries still run on all versions
818 of Windows starting with Windows 9X.
821 ** Emacs running on MS-Windows now supports the daemon mode.
823 ** OS X 10.5 or older is no longer supported.
825 ** OS X on PowerPC is no longer supported.
828 ----------------------------------------------------------------------
829 This file is part of GNU Emacs.
831 GNU Emacs is free software: you can redistribute it and/or modify
832 it under the terms of the GNU General Public License as published by
833 the Free Software Foundation, either version 3 of the License, or
834 (at your option) any later version.
836 GNU Emacs is distributed in the hope that it will be useful,
837 but WITHOUT ANY WARRANTY; without even the implied warranty of
838 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
839 GNU General Public License for more details.
841 You should have received a copy of the GNU General Public License
842 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
848 paragraph-separate: "[
\f]*$"