1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2017 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 26.
11 See file HISTORY for a list of GNU Emacs versions and release dates.
12 See files NEWS.25, NEWS.24, NEWS.23, NEWS.22, NEWS.21, NEWS.20,
13 NEWS.19, NEWS.18, and NEWS.1-17 for changes in older Emacs versions.
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.
19 +++ indicates that all necessary documentation updates are complete.
20 (This means all relevant manuals in doc/ AND lisp doc-strings.)
21 --- means no change in the manuals is needed.
22 When you add a new item, use the appropriate mark if you are sure it applies,
25 * Installation Changes in Emacs 26.1
27 ** By default libgnutls is now required when building Emacs.
28 Use 'configure --with-gnutls=no' to build even when GnuTLS is missing.
30 ** GnuTLS version 2.12.2 or later is now required, instead of merely
31 version 2.6.6 or later.
33 ** The new option 'configure --with-mailutils' causes Emacs to rely on
34 GNU Mailutils to retrieve email. It is recommended, and is the
35 default if GNU Mailutils is installed. When --with-mailutils is not
36 in effect, the Emacs build procedure by default continues to build and
37 install a limited 'movemail' substitute that retrieves POP3 email only
38 via insecure channels; to avoid this problem, use either
39 --with-mailutils or --without-pop when configuring.
41 ** The new option 'configure --enable-gcc-warnings=warn-only' causes
42 GCC to issue warnings without stopping the build. This behavior is
43 now the default in developer builds. As before, use
44 '--disable-gcc-warnings' to suppress GCC's warnings, and
45 '--enable-gcc-warnings' to stop the build if GCC issues warnings.
47 ** When GCC warnings are enabled, '--enable-check-lisp-object-type' is
48 now enabled by default when configuring.
51 ** The Emacs server now has socket-launching support. This allows
52 socket based activation, where an external process like systemd can
53 invoke the Emacs server process upon a socket connection event and
54 hand the socket over to Emacs. Emacs uses this socket to service
55 emacsclient commands. This new functionality can be disabled with the
56 configure option '--disable-libsystemd'.
59 ** A systemd user unit file is provided. Use it in the standard way:
60 systemctl --user enable emacs
61 (If your Emacs is installed in a non-standard location, you may
62 need to copy the emacs.service file to eg ~/.config/systemd/user/)
64 ** New configure option '--disable-build-details' attempts to build an
65 Emacs that is more likely to be reproducible; that is, if you build
66 and install Emacs twice, the second Emacs is a copy of the first.
67 Deterministic builds omit the build date from the output of the
68 emacs-version and erc-cmd-SV functions, and the leave the following
69 variables nil: emacs-build-system, emacs-build-time,
72 ** The configure option '--with-gameuser' now defaults to 'no',
73 as this appears to be the most common configuration in practice.
74 When it is 'no', the shared game directory and the auxiliary program
75 update-game-score are no longer needed and are not installed.
77 ** Emacs no longer works on IRIX. We expect that Emacs users are not
78 affected by this, as SGI stopped supporting IRIX in December 2013.
81 * Startup Changes in Emacs 26.1
84 ** New option '--fg-daemon'. This is the same as '--daemon', except
85 it runs in the foreground and does not fork. This is intended for
86 modern init systems such as systemd, which manage many of the traditional
87 aspects of daemon behavior themselves. '--bg-daemon' is now an alias
90 ** New option '--module-assertions'. If the user supplies this
91 option, Emacs will perform expensive correctness checks when dealing
92 with dynamic modules. This is intended for module authors that wish
93 to verify that their module conforms to the module requirements. The
94 option makes Emacs abort if a module-related assertion triggers.
97 ** Emacs now supports 24-bit colors on capable text terminals
98 Terminal is automatically initialized to use 24-bit colors if the
99 required capabilities are found in terminfo. See the FAQ node
100 "Colors on a TTY" for more information.
103 ** Emacs now obeys the X resource "scrollBar" at startup.
104 The effect is similar to that of "toolBar" resource on the tool bar.
107 * Changes in Emacs 26.1
110 ** The function 'assoc' now takes an optional third argument 'testfn'.
111 This argument, when non-nil, is used for comparison instead of
115 ** New variable 'executable-prefix-env' for inserting magic signatures.
116 This variable affects the format of the interpreter magic number
117 inserted by 'executable-set-magic'. If non-nil, the magic number now
118 takes the form "#!/usr/bin/env interpreter", otherwise the value
119 determined by 'executable-prefix', which is by default
120 "#!/path/to/interpreter". By default, 'executable-prefix-env' is nil,
121 so the default behavior is not changed.
124 ** The variable 'emacs-version' no longer includes the build number.
125 This is now stored separately in a new variable, 'emacs-build-number'.
128 ** The new function 'mapbacktrace' applies a function to all frames of
129 the current stack trace.
132 ** Emacs now provides a limited form of concurrency with Lisp threads.
133 Concurrency in Emacs Lisp is "mostly cooperative", meaning that
134 Emacs will only switch execution between threads at well-defined
135 times: when Emacs waits for input, during blocking operations related
136 to threads (such as mutex locking), or when the current thread
137 explicitly yields. Global variables are shared among all threads, but
138 a 'let' binding is thread-local. Each thread also has its own current
139 buffer and its own match data.
141 See the chapter "Threads" in the ELisp manual for full documentation
145 ** The new function 'file-name-case-insensitive-p' tests whether a
146 given file is on a case-insensitive filesystem.
149 ** The new user variable 'electric-quote-chars' provides a list
150 of curved quotes for 'electric-quote-mode', allowing user to choose
151 the types of quotes to be used.
153 ** The new user option 'electric-quote-context-sensitive' makes
154 'electric-quote-mode' context sensitive. If it is non-nil, you can
155 type an ASCII apostrophe to insert an opening or closing quote,
156 depending on context. Emacs will replace the apostrophe by an opening
157 quote character at the beginning of the buffer, the beginning of a
158 line, after a whitespace character, and after an opening parenthesis;
159 and it will replace the apostrophe by a closing quote character in all
162 ** The new variable 'electric-quote-inhibit-functions' controls when
163 to disable electric quoting based on context. Major modes can add
164 functions to this list; Emacs will temporarily disable
165 'electric-quote-mode' whenever any of the functions returns non-nil.
166 This can be used by major modes that derive from 'text-mode' but allow
167 inline code segments, such as 'markdown-mode'.
170 ** The new user variable 'dired-omit-case-fold' allows the user to
171 customize the case-sensitivity of dired-omit-mode. It defaults to
172 the same sensitivity as that of the filesystem for the corresponding
176 ** Emacs now uses double buffering to reduce flicker when editing and
177 resizing graphical Emacs frames on the X Window System. This support
178 requires the DOUBLE-BUFFER extension, which major X servers have
179 supported for many years. If your system has this extension, but an
180 Emacs built with double buffering misbehaves on some displays you use,
181 you can disable the feature by adding
183 '(inhibit-double-buffering . t)
185 to default-frame-alist. Or inject this parameter into the selected
186 frame by evaluating this form:
188 (modify-frame-parameters nil '((inhibit-double-buffering . t)))
191 The group 'wp', whose label was "text", is now deprecated.
192 Use the new group 'text', which inherits from 'wp', instead.
195 ** The new function 'call-shell-region' executes a command in an
196 inferior shell with the buffer region as input.
199 ** The new user option 'shell-command-dont-erase-buffer' controls
200 if the output buffer is erased between shell commands; if non-nil,
201 the output buffer is not erased; this variable also controls where
202 to set the point in the output buffer: beginning of the output,
203 end of the buffer or save the point.
204 When 'shell-command-dont-erase-buffer' is nil, the default value,
205 the behavior of 'shell-command', 'shell-command-on-region' and
206 'async-shell-command' is as usual.
209 ** The new user option 'async-shell-command-display-buffer' controls
210 whether the output buffer of an asynchronous command is shown
211 immediately, or only when there is output.
214 ** The new user option 'mouse-select-region-move-to-beginning'
215 controls the position of point when double-clicking mouse-1 on the end
216 of a parenthetical grouping or string-delimiter: the default value nil
217 keeps point at the end of the region, setting it to non-nil moves
218 point to the beginning of the region.
221 ** The new user option 'mouse-drag-and-drop-region' allows to drag the
222 entire region of text to another place or another buffer.
225 ** The new user option 'confirm-kill-processes' allows the user to
226 skip a confirmation prompt for killing subprocesses when exiting
227 Emacs. When set to t (the default), Emacs will prompt for
228 confirmation before killing subprocesses on exit, which is the same
232 ** 'find-library-name' will now fall back on looking at 'load-history'
233 to try to locate libraries that have been loaded with an explicit path
237 ** Faces in 'minibuffer-prompt-properties' no longer overwrite properties
238 in the text in functions like 'read-from-minibuffer', but instead are
239 added to the end of the face list. This allows users to say things
240 like '(read-from-minibuffer (propertize "Enter something: " 'face 'bold))'.
243 ** The new variable 'extended-command-suggest-shorter' has been added
244 to control whether to suggest shorter 'M-x' commands or not.
247 ** icomplete now respects 'completion-ignored-extensions'.
250 ** Non-breaking hyphens are now displayed with the 'nobreak-hyphen'
251 face instead of the 'escape-glyph' face.
254 ** Approximations to quotes are now displayed with the new 'homoglyph'
255 face instead of the 'escape-glyph' face.
258 ** New face 'header-line-highlight'.
259 This face is the header-line analogue of 'mode-line-highlight'; it
260 should be the preferred mouse-face for mouse-sensitive elements in the
264 ** 'C-x h' ('mark-whole-buffer') will now avoid marking the prompt
268 ** 'find-library' now takes a prefix argument to pop to a different
272 ** 'process-attributes' on Darwin systems now returns more information.
275 ** Several accessors for the value returned by 'file-attributes'
276 have been added. They are: 'file-attribute-type',
277 'file-attribute-link-number', 'file-attribute-user-id',
278 'file-attribute-group-id', 'file-attribute-access-time',
279 'file-attribute-modification-time',
280 'file-attribute-status-change-time', 'file-attribute-size',
281 'file-attribute-modes', 'file-attribute-inode-number',
282 'file-attribute-device-number' and 'file-attribute-collect'.
285 ** The new function 'buffer-hash' computes a fast, non-consing hash of
289 ** 'fill-paragraph' no longer marks the buffer as changed unless it
290 actually changed something.
293 ** The locale language name 'ca' is now mapped to the language
294 environment 'Catalan', which has been added.
297 ** 'align-regexp' has a separate history for its interactive argument.
298 'align-regexp' no longer shares its history with all other
299 history-less functions that use 'read-string'.
302 ** The networking code has been reworked so that it's more
303 asynchronous than it was (when specifying :nowait t in
304 'make-network-process'). How asynchronous it is varies based on the
305 capabilities of the system, but on a typical GNU/Linux system the DNS
306 resolution, the connection, and (for TLS streams) the TLS negotiation
307 are all done without blocking the main Emacs thread. To get
308 asynchronous TLS, the TLS boot parameters have to be passed in (see
309 the manual for details).
311 Certain process oriented functions (like 'process-datagram-address')
312 will block until socket setup has been performed. The recommended way
313 to deal with asynchronous sockets is to avoid interacting with them
314 until they have changed status to "run". This is most easily done
315 from a process sentinel.
317 ** 'make-network-process' and 'open-network-stream' sometimes allowed
318 :service to be an integer string (e.g., :service "993") and sometimes
319 required an integer (e.g., :service 993). This difference has been
320 eliminated, and integer strings work everywhere.
322 ** It is possible to disable attempted recovery on fatal signals.
324 Two new variables support disabling attempts to recover from stack
325 overflow and to avoid automatic auto-save when Emacs is delivered a
326 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
327 will disable attempts to recover from C stack overflows; Emacs will
328 then crash as with any other fatal signal.
329 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
330 disable attempts to auto-save the session and shut down in an orderly
331 fashion when Emacs receives a fatal signal; instead, Emacs will
332 terminate immediately. Both variables are non-'nil' by default.
333 These variables are for users who would like to avoid the small
334 probability of data corruption due to techniques Emacs uses to recover
338 ** File local and directory local variables are now initialized each
339 time the major mode is set, not just when the file is first visited.
340 These local variables will thus not vanish on setting a major mode.
343 ** A second dir-local file (.dir-locals-2.el) is now accepted.
344 See the variable 'dir-locals-file-2' for more information.
347 ** Connection-local variables can be used to specify local variables
348 with a value depending on the connected remote server. For details,
349 see the node "Connection Local Variables" in the ELisp manual.
352 ** International domain names (IDNA) are now encoded via the new
353 puny.el library, so that one can visit web sites with non-ASCII URLs.
356 ** The new 'timer-list' command lists all active timers in a buffer,
357 where you can cancel them with the 'c' command.
360 ** The new function 'read-multiple-choice' prompts for multiple-choice
361 questions, with a handy way to display help texts.
364 ** 'switch-to-buffer-preserve-window-point' now defaults to t.
367 ** The new variable 'debugger-stack-frame-as-list' allows displaying
368 all call stack frames in a Lisp backtrace buffer as lists. Both
369 debug.el and edebug.el have been updated to heed to this variable.
372 ** Values in call stack frames are now displayed using 'cl-prin1'.
373 The old behaviour of using 'prin1' can be restored by customizing the
374 new option 'debugger-print-function'.
377 ** NUL bytes in strings copied to the system clipboard are now
381 ** The new variable 'x-ctrl-keysym' has been added to the existing
382 roster of X keysyms. It can be used in combination with another
383 variable of this kind to swap modifiers in Emacs.
386 ** New input methods: 'cyrillic-tuvan', 'polish-prefix'.
389 ** The 'dutch' input method no longer attempts to support Turkish too.
390 Also, it no longer converts 'IJ' and 'ij' to the compatibility
391 characters U+0132 LATIN CAPITAL LIGATURE IJ and U+0133 LATIN SMALL
395 ** File name quoting by adding the prefix "/:" is now possible for the
396 local part of a remote file name. Thus, if you have a directory named
397 "/~" on the remote host "foo", you can prevent it from being
398 substituted by a home directory by writing it as "/foo:/:/~/file".
401 ** The new variable 'maximum-scroll-margin' allows having effective
402 settings of 'scroll-margin' up to half the window size, instead of
403 always restricting the margin to a quarter of the window.
406 ** Emacs can scroll horizontally using mouse, touchpad, and trackbar.
407 You can enable this by customizing 'mwheel-tilt-scroll-p'. If you
408 want to reverse the direction of the scroll, customize
409 'mwheel-flip-direction'.
412 ** Emacsclient has a new option -u/--suppress-output. The option
413 suppresses display of return values from the server process.
416 ** New user option 'dig-program-options' and extended functionality
417 for DNS-querying functions 'nslookup-host', 'dns-lookup-host',
418 and 'run-dig'. Each function now accepts an optional name server
419 argument interactively (with a prefix argument) and non-interactively.
422 ** Emacsclient has a new option -T/--tramp.
423 This helps with using a local Emacs session as the server for a remote
424 emacsclient. With appropriate setup, one can now set the EDITOR
425 environment variable on a remote machine to emacsclient, and
426 use the local Emacs to edit remote files via Tramp. See the node
427 "emacsclient Options" in the user manual for the details.
430 ** 'describe-key-briefly' now ignores mouse movement events.
433 ** The new variable 'eval-expression-print-maximum-character' prevents
434 large integers from being displayed as characters.
436 ** Two new commands for finding the source code of Emacs Lisp
437 libraries: 'find-library-other-window' and 'find-library-other-frame'.
440 ** The new variable 'display-raw-bytes-as-hex' allows to change the
441 display of raw bytes from octal to hex.
443 ** You can now provide explicit field numbers in format specifiers.
444 For example, '(format "%2$s %1$s" "X" "Y")' produces "Y X".
446 ** 'comment-indent-function' values may now return a cons to specify a
447 range of indentation.
450 ** Emacs now supports optional display of line numbers in the buffer.
451 This is similar to what linum-mode provides, but much faster and
452 doesn't usurp the display margin for the line numbers. Customize the
453 buffer-local variable 'display-line-numbers' to activate this optional
454 display. Alternatively, you can use the `display-line-numbers-mode'
455 minor mode or the global `global-display-line-numbers-mode'. When
456 using these modes, customize `display-line-numbers-type' with the same
457 value as you would use with `display-line-numbers'.
459 If `display-line-numbers' is set to t, Emacs will display the number
460 of each line before the line. If set to 'relative', Emacs will
461 display the line number relative to the line showing point, with that
462 line's number displayed as absolute. If set to 'visual', Emacs will
463 display a relative number for every screen line, i.e. it will count
464 screen lines rather than buffer lines. The default is nil, which
465 doesn't display the line numbers.
467 In 'relative' and 'visual' modes, the variable
468 'display-line-numbers-current-absolute' controls what number is
469 displayed for the line showing point. By default, this variable's
470 value is t, which means display the absolute line number for the line
471 showing point. Customizing this variable to a nil value will cause
472 Emacs to show zero instead, which preserves horizontal space of the
473 window in large buffers.
475 Line numbers are not displayed at all in minibuffer windows and in
476 tooltips, as they are not useful there.
478 The new face 'line-number' is used to display the line numbers. The
479 new face 'line-number-current-line' can be customized to display the
480 current line's number differently from all the other line numbers; by
481 default these two faces are identical.
483 You can also customize the new buffer-local variable
484 'display-line-numbers-width' to specify a fixed minimal with of the
485 area allocated to line-number display. The default is nil, meaning
486 that Emacs will dynamically calculate the area width, enlarging or
487 shrinking it as needed. Setting it to a non-negative integer
488 specifies that as the minimal width; selecting a value that is large
489 enough to display all line numbers in a buffer will then keep the
490 line-number display area of constant width at all times, if that is
493 When using `display-line-numbers-mode', you can customize the variable
494 `display-line-numbers-grow-only' to a non-nil value; this means that
495 Emacs may grow the above area width dynamically, but never shrink it.
496 Under this mode, customizing the variable
497 `display-line-numbers-width-start' to a non-nil value will cause Emacs
498 to set `display-line-numbers-width' to the minimum width necessary to
499 display all line numbers in the current buffer when first visiting it.
501 Lisp programs can disable line-number display for a particular screen
502 line by putting the 'display-line-numbers-disable' text property or
503 overlay property on the first character of that screen line. This is
504 intended for add-on packages that need a finer control of the display.
506 Lisp programs that need to know how much screen estate is used up for
507 line-number display in a window can use the new function
508 'line-number-display-width'.
510 Linum mode and all similar packages are henceforth becoming obsolete.
511 Users and developers are encouraged to switch to this new feature
515 * Editing Changes in Emacs 26.1
518 ** New variable 'column-number-indicator-zero-based'.
519 Traditionally, in Column Number mode, the displayed column number
520 counts from zero starting at the left margin of the window. This
521 behavior is now controlled by 'column-number-indicator-zero-based'.
522 If you would prefer for the displayed column number to count from one,
523 you may set this variable to nil. (Behind the scenes, there is now a
524 new mode line construct, '%C', which operates exactly as '%c' does
525 except that it counts from one.)
528 ** New single-line horizontal scrolling mode.
529 The 'auto-hscroll-mode' variable can now have a new special value,
530 'current-line', which causes only the line where the cursor is
531 displayed to be horizontally scrolled when lines are truncated on
532 display and point moves outside the left or right window margin.
535 ** New mode line constructs '%o' and '%q', and user option
536 'mode-line-percent-position'. '%o' displays the "degree of travel" of
537 the window through the buffer. Unlike the default '%p', this
538 percentage approaches 100% as the window approaches the end of the
539 buffer. '%q' displays the percentage offsets of both the start and
540 the end of the window, e.g. "5-17%". The new option
541 'mode-line-percent-position' makes it easier to switch between '%p',
542 '%P', and these new constructs.
545 ** Two new user options 'list-matching-lines-jump-to-current-line' and
546 'list-matching-lines-current-line-face' to show highlighted the current
547 line in *Occur* buffer.
550 ** The 'occur' command can now operate on the region.
553 ** New bindings for 'query-replace-map'.
554 'undo', undo the last replacement; bound to 'u'.
555 'undo-all', undo all replacements; bound to 'U'.
557 ** 'delete-trailing-whitespace' deletes whitespace after form feed.
558 In modes where form feed was treated as a whitespace character,
559 'delete-trailing-whitespace' would keep lines containing it unchanged.
560 It now deletes whitespace after the last form feed thus behaving the
561 same as in modes where the character is not whitespace.
563 ** No more prompt about changed file when the file's content is unchanged.
564 Instead of only checking the modification time, Emacs now also checks
565 the file's actual content before prompting the user.
567 ** Various casing improvements.
569 *** 'upcase', 'upcase-region' et al. convert title case characters
570 (such as Dz) into their upper case form (such as DZ).
572 *** 'capitalize', 'upcase-initials' et al. make use of title-case forms
573 of initial characters (correctly producing for example Džungla instead
574 of incorrect DŽungla).
576 *** Characters which turn into multiple ones when cased are correctly handled.
577 For example, fi ligature is converted to FI when upper cased.
579 *** Greek small sigma is correctly handled when at the end of the word.
580 Strings such as ΌΣΟΣ are now correctly converted to Όσος when
581 capitalized instead of incorrect Όσοσ (compare lowercase sigma at the
584 ** Emacs can now auto-save buffers to visited files in a more robust
585 manner via the new mode 'auto-save-visited-mode'. Unlike
586 'auto-save-visited-file-name', this mode uses the normal saving
587 procedure and therefore obeys saving hooks.
588 'auto-save-visited-file-name' is now obsolete.
591 ** New behavior of 'mark-defun' implemented
592 Prefix argument selects that many (or that many more) defuns.
593 Negative prefix arg flips the direction of selection. Also,
594 'mark-defun' between defuns correctly selects N following defuns (or
595 -N previous for negative arguments). Finally, comments preceding the
596 defun are selected unless they are separated from the defun by a blank
599 ** New command 'replace-buffer-contents'.
600 This command replaces the contents of the accessible portion of the
601 current buffer with the contents of the accessible portion of a
602 different buffer while keeping point, mark, markers, and text
603 properties as intact as possible.
606 ** New commands 'apropos-local-variable' and 'apropos-local-value.
607 These are buffer-local versions of 'apropos-variable' and
608 'apropos-value', respectively. They show buffer-local variables whose
609 names and values, respectively, match a given pattern.
612 ** More user control of reordering bidirectional text for display.
613 The two new variables, 'bidi-paragraph-start-re' and
614 'bidi-paragraph-separate-re', allow customization of what exactly are
615 paragraphs, for the purposes of bidirectional display.
618 * Changes in Specialized Modes and Packages in Emacs 26.1
620 ** New function `cl-generic-p'.
625 *** You can answer 'all' in 'dired-do-delete' to delete recursively all
626 remaining directories without more prompts.
629 *** Dired supports wildcards in the directory part of the file names.
632 *** You can now use '`?`' in 'dired-do-shell-command'; as ' ? ', it gets replaced
633 by the current file name.
635 *** html2text is now marked obsolete.
637 *** smerge-refine-regions can refine regions in separate buffers
639 *** Info menu and index completion uses substring completion by default.
640 This can be customized via the info-menu category in
641 completion-category-override.
644 *** The ancestor buffer is shown by default in 3way merges.
645 A new option ediff-show-ancestor and a new toggle
646 ediff-toggle-show-ancestor.
648 ** TeX: Add luatex and xetex as alternatives to pdftex
650 ** Electric-Buffer-menu
653 *** Key 'U' is bound to 'Buffer-menu-unmark-all' and key 'M-DEL' is
654 bound to 'Buffer-menu-unmark-all-buffers'.
659 *** Two new commands 'bs-unmark-all', bound to 'U', and
660 'bs-unmark-previous', bound to <backspace>.
665 *** Two new commands 'Buffer-menu-unmark-all', bound to 'U' and
666 'Buffer-menu-unmark-all-buffers', bound to 'M-DEL'.
671 *** The .newsrc file will now only be saved if the native select
672 method is an NNTP select method.
675 *** A new command for sorting articles by readedness marks has been
676 added: 'C-c C-s C-m C-m'.
681 *** New command 'ibuffer-jump'.
684 *** New filter commands 'ibuffer-filter-by-basename',
685 'ibuffer-filter-by-file-extension', 'ibuffer-filter-by-directory',
686 'ibuffer-filter-by-starred-name', 'ibuffer-filter-by-modified'
687 and 'ibuffer-filter-by-visiting-file'; bound respectively
688 to '/b', '/.', '//', '/*', '/i' and '/v'.
691 *** Two new commands 'ibuffer-filter-chosen-by-completion'
692 and 'ibuffer-and-filter', the second bound to '/&'.
695 *** The commands 'ibuffer-pop-filter', 'ibuffer-pop-filter-group',
696 'ibuffer-or-filter' and 'ibuffer-filter-disable' have the alternative
697 bindings '/<up>', '/S-<up>', '/|' and '/DEL', respectively.
700 *** The data format specifying filters has been extended to allow
701 explicit logical 'and', and a more flexible form for logical 'not'.
702 See 'ibuffer-filtering-qualifiers' doc string for full details.
705 *** A new command 'ibuffer-copy-buffername-as-kill'; bound
709 *** New command 'ibuffer-change-marks'; bound to '* c'.
712 *** A new command 'ibuffer-mark-by-locked' to mark
713 all locked buffers; bound to '% L'.
716 *** A new option 'ibuffer-locked-char' to indicate
717 locked buffers; Ibuffer shows a new column displaying
718 'ibuffer-locked-char' for locked buffers.
721 *** A new command 'ibuffer-unmark-all-marks' to unmark
722 all buffers without asking confirmation; bound to
723 'U'; 'ibuffer-do-replace-regexp' bound to 'r'.
726 *** A new command 'ibuffer-mark-by-content-regexp' to mark buffers
727 whose content matches a regexp; bound to '% g'.
730 *** Two new options 'ibuffer-never-search-content-name' and
731 'ibuffer-never-search-content-mode' used by
732 'ibuffer-mark-by-content-regexp'.
736 *** Support for opening links to man pages in Man or WoMan mode.
741 *** New user option 'comint-move-point-for-matching-input' to control
742 where to place point after C-c M-r and C-c M-s.
747 *** Messages from CMake are now recognized.
750 *** The number of errors, warnings, and informational messages is now
751 displayed in the mode line. These are updated as compilation
755 *** A new option 'dired-always-read-filesystem' default to nil.
756 If non-nil, buffers visiting files are reverted before search them;
757 for instance, in 'dired-mark-files-containing-regexp' a non-nil value
758 of this option means the file is revisited in a temporary buffer;
759 this temporary buffer is the actual buffer searched: the original buffer
760 visiting the file is not modified.
763 *** In wdired, when editing files to contain slash characters,
764 the resulting directories are automatically created. Whether to do
765 this is controlled by the 'wdired-create-parent-directories' variable.
768 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
769 viewing HTML files and the like.
774 *** Grep commands will now use GNU grep's '--null' option if
775 available, which allows distinguishing the filename from contents if
776 they contain colons. This can be controlled by the new custom option
777 'grep-use-null-filename-separator'.
779 *** The grep/rgrep/lgrep functions will now ask about saving files
780 before running. This is controlled by the 'grep-save-buffers'
785 *** Edebug can be prevented from pausing 1 second after reaching a
786 breakpoint (e.g. with "f" and "o") by customizing the new option
787 'edebug-sit-on-break'.
790 *** New customizable option 'edebug-max-depth'
791 This allows to enlarge the maximum recursion depth when instrumenting
796 *** 'eshell-input-filter's value is now a named function
797 'eshell-input-filter-default', and has a new custom option
798 'eshell-input-filter-initial-space' to ignore adding commands prefixed
799 with blank space to eshell history.
804 *** New 'M-RET' command for opening a link at point in a new eww buffer.
807 *** A new 's' command for switching to another eww buffer via the minibuffer.
810 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
811 with the 'o' command from 'image-map'.
814 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
815 whether to use the HTML-specified colors or not. The user can also
816 customize the 'shr-use-colors' variable.
819 *** Images that are being loaded are now marked with gray
820 "placeholder" images of the size specified by the HTML. They are then
821 replaced by the real images asynchronously, which will also now
822 respect width/height HTML specs (unless they specify widths/heights
823 bigger than the current window).
826 *** The 'w' command on links is now 'shr-maybe-probe-and-copy-url'.
827 'shr-copy-url' now only copies the url at point; users who wish to
828 avoid accidentally accessing remote links may rebind 'w' and 'u' in
829 'eww-link-keymap' to it.
834 *** The commands 'find-alternate-file-other-window',
835 'dired-other-window', 'dired-other-frame', and
836 'display-buffer-other-window' are now remapped to Ido equivalents if
842 *** Images are automatically scaled before displaying based on the
843 'image-scaling-factor' variable (if Emacs supports scaling the images
847 *** It's now possible to specify aspect-ratio preserving combinations
848 of :width/:max-height and :height/:max-width keywords. In either
849 case, the "max" keywords win. (Previously some combinations would,
850 depending on the aspect ratio of the image, just be ignored and in
851 other instances this would lead to the aspect ratio not being
855 *** Images inserted with 'insert-image' and related functions get a
856 keymap put into the text properties (or overlays) that span the
857 image. This keymap binds keystrokes for manipulating size and
858 rotation, as well as saving the image to a file. These commands are
859 also available in 'image-mode'.
862 *** A new library for creating and manipulating SVG images has been
863 added. See the "SVG Images" section in the Lisp reference manual for
867 *** New setf-able function to access and set image parameters is
868 provided: 'image-property'.
871 *** New commands 'image-scroll-left' and 'image-scroll-right'
872 for 'image-mode' that complement 'image-scroll-up' and
873 'image-scroll-down': they have the same prefix arg behavior and stop
878 *** Now provides a minor mode 'image-dired-minor-mode' which replaces
879 the function 'image-dired-setup-dired-keybindings'.
881 *** Thumbnail generation is now asynchronous
882 The number of concurrent processes is limited by the variable
883 'image-dired-thumb-job-limit'.
885 *** 'image-dired-thumbnail-storage' has a new option 'standard-large'
886 for generating 256x256 thumbnails according to the Thumbnail Managing
889 *** Inherits movement keys from 'image-mode' for viewing full images.
890 This includes the usual char, line, and page movement commands.
892 *** All the -options types have been changed to argument lists
893 instead of shell command strings. This change affects
894 'image-dired-cmd-create-thumbnail-options',
895 'image-dired-cmd-create-temp-image-options',
896 'image-dired-cmd-rotate-thumbnail-options',
897 'image-dired-cmd-rotate-original-options',
898 'image-dired-cmd-write-exif-data-options',
899 'image-dired-cmd-read-exif-data-options', and introduces
900 'image-dired-cmd-pngnq-options', 'image-dired-cmd-pngcrush-options',
901 'image-dired-cmd-create-standard-thumbnail-options'
903 *** Recognizes more tools by default, including pngnq-s9 and OptiPNG
905 *** 'find-file' and related commands now work on thumbnails and
906 displayed images, providing a default argument of the original file name
907 via an addition to 'file-name-at-point-functions'.
910 ** The default 'Info-default-directory-list' no longer checks some obsolete
911 directory suffixes (gnu, gnu/lib, gnu/lib/emacs, emacs, lib, lib/emacs)
912 when searching for info directories.
915 ** The commands that add ChangeLog entries now prefer a VCS root directory
916 for the ChangeLog file, if none already exists. Customize
917 'change-log-directory-files' to nil for the old behavior.
920 ** Support for non-string values of 'time-stamp-format' has been removed.
925 *** 'message-use-idna' now defaults to t (because Emacs comes with
926 built-in IDNA support now).
929 *** When sending HTML messages with embedded images, and you have
930 exiftool installed, and you rotate images with EXIF data (i.e.,
931 JPEGs), the rotational information will be inserted into the outgoing
932 image in the message. (The original image will not have its
933 orientation affected.)
936 *** The 'message-valid-fqdn-regexp' variable has been removed, since
937 there are now top-level domains added all the time. Message will no
938 longer warn about sending emails to top-level domains it hasn't heard
941 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
942 In 'visual-line-mode' it will look for the true beginning of a header
943 while in non-'visual-line-mode' it will move the point to the indented
949 *** The new variable 'package-gnupghome-dir' has been added to control
950 where the GnuPG home directory (used for signature verification) is
951 located and whether GnuPG's option "--homedir" is used or not.
954 *** Deleting a package no longer respects 'delete-by-moving-to-trash'.
959 *** The method part of remote file names is mandatory now. A valid
960 remote file name starts with "/method:host:" or "/method:user@host:".
963 *** The new pseudo method "-" is a marker for the default method.
964 "/-::" is the shortest remote file name then.
967 *** The command 'tramp-change-syntax' allows to choose an alternative
968 remote file name syntax.
971 *** New connection method "sg", which supports editing files under a
975 *** New connection method "doas" for OpenBSD hosts.
978 *** New connection method "gdrive", which allows to access Google
979 Drive onsite repositories.
982 *** Gateway methods in Tramp have been removed. Instead, the Tramp
983 manual documents how to configure ssh and PuTTY accordingly.
986 *** Setting the "ENV" environment variable in
987 'tramp-remote-process-environment' enables reading of shell
988 initialization files.
991 *** Variable 'tramp-completion-mode' is obsoleted.
994 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
999 *** JS mode now sets 'comment-multi-line' to t.
1002 *** New variable 'js-indent-align-list-continuation', when set to nil,
1003 will not align continuations of bracketed lists, but will indent them
1004 by the fixed width 'js-indent-level'.
1009 *** Support for completing attribute values, at-rules, bang-rules,
1010 HTML tags, classes and IDs using the 'completion-at-point' command.
1011 Completion candidates for HTML classes and IDs are retrieved from open
1015 *** CSS mode now binds 'C-h S' to a function that will show
1016 information about a CSS construct (an at-rule, property, pseudo-class,
1017 pseudo-element, with the default being guessed from context). By
1018 default the information is looked up on the Mozilla Developer Network,
1019 but this can be customized using 'css-lookup-url-format'.
1022 *** CSS colors are fontified using the color they represent as the
1023 background. For instance, #ff0000 would be fontified with a red
1027 ** Emacs now supports character name escape sequences in character and
1028 string literals. The syntax variants \N{character name} and
1029 \N{U+code} are supported.
1032 ** Prog mode has some support for multi-mode indentation.
1033 This allows better indentation support in modes that support multiple
1034 programming languages in the same buffer, like literate programming
1035 environments or ANTLR programs with embedded Python code.
1037 A major mode can provide indentation context for a sub-mode through
1038 the 'prog-indentation-context' variable. To support this, modes that
1039 provide indentation should use 'prog-widen' instead of 'widen' and
1040 'prog-first-column' instead of a literal zero. See the node
1041 "Mode-Specific Indent" in the ELisp manual for more details.
1045 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
1051 *** The new function 'url-cookie-delete-cookie' can be used to
1052 programmatically delete all cookies, or cookies from a specific
1056 *** 'url-retrieve-synchronously' now takes an optional timeout parameter.
1059 *** The URL package now support HTTPS over proxies supporting CONNECT.
1062 *** 'url-user-agent' now defaults to 'default', and the User-Agent
1063 string is computed dynamically based on 'url-privacy-level'.
1065 ** VC and related modes
1068 *** The VC state indicator in the mode line now defaults to more
1069 colorful faces to make it more obvious to the user what the state is.
1070 See the 'vc-faces' customization group.
1073 *** 'vc-dir-mode' now binds 'vc-log-outgoing' to 'O'; and has various
1074 branch-related commands on a keymap bound to 'B'.
1078 *** Opening a .h file will turn C or C++ mode depending on language used.
1079 This is done with the help of 'c-or-c++-mode' function which analyses
1080 contents of the buffer to determine whether it's a C or C++ source
1084 ** New DNS mode command 'dns-mode-ipv6-to-nibbles' to convert IPv6 addresses
1085 to a format suitable for reverse lookup zone files.
1090 *** Emacs does no longer prompt the user before killing Flymake
1094 * New Modes and Packages in Emacs 26.1
1096 ** New Elisp data-structure library 'radix-tree'.
1098 ** New library 'xdg' with utilities for some XDG standards and specs.
1103 *** A new submode of 'html-mode', 'mhtml-mode', is now the default
1104 mode for *.html files. This mode handles indentation,
1105 fontification, and commenting for embedded JavaScript and CSS.
1107 ** New minor mode 'pixel-scroll-mode' provides smooth pixel-level scrolling.
1110 * Incompatible Lisp Changes in Emacs 26.1
1112 *** password-data is now a hash-table
1113 so that `password-read' can use any object for the `key' argument.
1116 *** Command 'dired-mark-extension' now automatically prepends a '.' to the
1117 extension when not present. The new command 'dired-mark-suffix' behaves
1118 similarly but it doesn't prepend a '.'.
1121 ** Certain cond/pcase/cl-case forms are now compiled using a faster jump
1122 table implementation. This uses a new bytecode op 'switch', which isn't
1123 compatible with previous Emacs versions. This functionality can be disabled
1124 by setting 'byte-compile-cond-use-jump-table' to nil.
1126 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
1127 mode to send the same escape sequences that xterm does. This makes
1128 things like forward-word in readline work.
1131 ** hideshow mode got four key bindings that are analogous to outline
1132 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
1135 ** Customizable variable 'query-replace-from-to-separator'
1136 now doesn't propertize the string value of the separator.
1137 Instead, text properties are added by query-replace-read-from.
1138 Additionally, the new nil value restores pre-24.5 behavior
1139 of not providing replacement pairs via the history.
1141 ** Some obsolete functions, variables, and faces have been removed:
1142 *** make-variable-frame-local. Variables cannot be frame-local any more.
1143 *** From subr.el: window-dot, set-window-dot, read-input, show-buffer,
1144 eval-current-buffer, string-to-int
1145 *** icomplete-prospects-length.
1146 *** All the default-FOO variables that hold the default value of the
1147 FOO variable. Use 'default-value' and 'setq-default' to access and
1148 change FOO, respectively. The exhaustive list of removed variables is:
1149 'default-mode-line-format', 'default-header-line-format',
1150 'default-line-spacing', 'default-abbrev-mode', 'default-ctl-arrow',
1151 'default-truncate-lines', 'default-left-margin', 'default-tab-width',
1152 'default-case-fold-search', 'default-left-margin-width',
1153 'default-right-margin-width', 'default-left-fringe-width',
1154 'default-right-fringe-width', 'default-fringes-outside-margins',
1155 'default-scroll-bar-width', 'default-vertical-scroll-bar',
1156 'default-indicate-empty-lines', 'default-indicate-buffer-boundaries',
1157 'default-fringe-indicator-alist', 'default-fringe-cursor-alist',
1158 'default-scroll-up-aggressively', 'default-scroll-down-aggressively',
1159 'default-fill-column', 'default-cursor-type',
1160 'default-cursor-in-non-selected-windows',
1161 'default-buffer-file-coding-system', 'default-major-mode', and
1162 'default-enable-multibyte-characters'.
1163 *** Many variables obsoleted in 22.1 referring to face symbols
1166 ** The variable 'text-quoting-style' no longer affects the treatment
1167 of curved quotes in format arguments to functions like 'message' and
1168 'format-message'. In particular, when this variable's value is
1169 'grave', all quotes in formats are output as-is.
1171 ** Functions like 'check-declare-file' and 'check-declare-directory'
1172 now generate less chatter and more-compact diagnostics. The auxiliary
1173 function 'check-declare-errmsg' has been removed.
1176 ** The regular expression character class [:blank:] now matches
1177 Unicode horizontal whitespace as defined in the Unicode Technical
1178 Standard #18. If you only want to match space and tab, use [ \t]
1182 ** 'min' and 'max' no longer round their results. Formerly, they
1183 returned a floating-point value if any argument was floating-point,
1184 which was sometimes numerically incorrect. For example, on a 64-bit
1185 host (max 1e16 10000000000000001) now returns its second argument
1186 instead of its first.
1189 ** The variable 'old-style-backquotes' has been made internal and
1190 renamed to 'lread--old-style-backquotes'. No user code should use
1193 ** To avoid confusion caused by "smart quotes", the reader no longer
1194 accepts Lisp symbols which begin with the following quotation
1195 characters: ‘’‛“”‟〞"', unless they are escaped with backslash.
1198 ** Module functions are now implemented slightly differently; in
1199 particular, the function 'internal--module-call' has been removed.
1200 Code that depends on undocumented internals of the module system might
1204 ** The arguments LOCKNAME and MUSTBENEW of 'write-region' are
1205 propagated to file name handlers now.
1208 * Lisp Changes in Emacs 26.1
1210 ** New function `define-symbol-prop'.
1213 ** New optional argument TESTFN in 'alist-get', 'map-elt' and 'map-put'.
1215 ** New function 'seq-set-equal-p' to check if SEQUENCE1 and SEQUENCE2
1216 contain the same elements, regardless of the order.
1221 ** New function 'secure-hash-algorithms' to list the algorithms that
1222 'secure-hash' supports.
1223 See the node "(elisp) Checksum/Hash" in the ELisp manual for details.
1226 ** Emacs now exposes the GnuTLS cryptographic API with the functions
1227 'gnutls-macs' and 'gnutls-hash-mac'; 'gnutls-digests' and
1228 'gnutls-hash-digest'; 'gnutls-ciphers' and 'gnutls-symmetric-encrypt'
1229 and 'gnutls-symmetric-decrypt'.
1230 See the node "(elisp) GnuTLS Cryptography" in the ELisp manual for details.
1233 ** Emacs now supports records for user-defined types, via the new
1234 functions 'make-record', 'record', and 'recordp'. Records are now
1235 used internally to represent cl-defstruct and defclass instances, for
1239 ** 'save-some-buffers' now uses 'save-some-buffers-default-predicate'
1240 to decide which buffers to ask about, if the PRED argument is nil.
1241 The default value of 'save-some-buffers-default-predicate' is nil,
1242 which means ask about all file-visiting buffers.
1244 ** string-(to|as|make)-(uni|multi)byte are now declared obsolete.
1245 ** New variable 'while-no-input-ignore-events' which allow
1246 setting which special events 'while-no-input' should ignore.
1247 It is a list of symbols.
1249 ** New function 'undo-amalgamate-change-group' to get rid of
1250 undo-boundaries between two states.
1252 ** New var 'definition-prefixes' is a hash table mapping prefixes to
1253 the files where corresponding definitions can be found. This can be
1254 used to fetch definitions that are not yet loaded, for example for
1257 ** New var 'syntax-ppss-table' to control the syntax-table used in
1261 ** 'define-derived-mode' can now specify an :after-hook form, which
1262 gets evaluated after the new mode's hook has run. This can be used to
1263 incorporate configuration changes made in the mode hook into the
1266 ** Autoload files can be generated without timestamps,
1267 by setting 'autoload-timestamps' to nil.
1268 FIXME As an experiment, nil is the current default.
1269 If no insurmountable problems before next release, it can stay that way.
1272 ** 'gnutls-boot' now takes a parameter ':complete-negotiation' that
1273 says that negotiation should complete even on non-blocking sockets.
1276 ** There is now a new variable 'flyspell-sort-corrections-function'
1277 that allows changing the way corrections are sorted.
1280 ** The new command 'fortune-message' has been added, which displays
1281 fortunes in the echo area.
1284 ** New function 'func-arity' returns information about the argument list
1285 of an arbitrary function. This generalizes 'subr-arity' for functions
1286 that are not built-in primitives. We recommend using this new
1287 function instead of 'subr-arity'.
1289 ** New function 'region-bounds' can be used in the interactive spec
1290 to provide region boundaries (for rectangular regions more than one)
1291 to an interactively callable function as a single argument instead of
1292 two separate arguments region-beginning and region-end.
1295 ** 'parse-partial-sexp' state has a new element. Element 10 is
1296 non-nil when the last character scanned might be the first character
1297 of a two character construct, i.e., a comment delimiter or escaped
1298 character. Its value is the syntax of that last character.
1301 ** 'parse-partial-sexp's state, element 9, has now been confirmed as
1302 permanent and documented, and may be used by Lisp programs. Its value
1303 is a list of currently open parenthesis positions, starting with the
1304 outermost parenthesis.
1307 ** 'read-color' will now display the color names using the color itself
1308 as the background color.
1310 ** The function 'redirect-debugging-output' now works on platforms
1311 other than GNU/Linux.
1314 ** The new function 'string-version-lessp' compares strings by
1315 interpreting consecutive runs of numerical characters as numbers, and
1316 compares their numerical values. According to this predicate,
1317 "foo2.png" is smaller than "foo12.png".
1320 ** Numeric comparisons and 'logb' no longer return incorrect answers
1321 due to internal rounding errors. For example, (< most-positive-fixnum
1322 (+ 1.0 most-positive-fixnum)) now correctly returns t on 64-bit hosts.
1325 ** The functions 'ffloor', 'fceiling', 'ftruncate' and 'fround' now
1326 accept only floating-point arguments, as per their documentation.
1327 Formerly, they quietly accepted integer arguments and sometimes
1328 returned nonsensical answers, e.g., (< N (ffloor N)) could return t.
1331 ** On hosts like GNU/Linux x86-64 where a 'long double' fraction
1332 contains at least EMACS_INT_WIDTH - 3 bits, 'format' no longer returns
1333 incorrect answers due to internal rounding errors when formatting
1334 Emacs integers with %e, %f, or %g conversions. For example, on these
1335 hosts (eql N (string-to-number (format "%.0f" N))) now returns t for
1336 all Emacs integers N.
1339 ** Calls that accept floating-point integers (for use on hosts with
1340 limited integer range) now signal an error if arguments are not
1341 integral. For example (decode-char 'ascii 0.5) now signals an error.
1344 ** The new function 'char-from-name' converts a Unicode name string
1345 to the corresponding character code.
1348 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
1349 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
1350 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
1351 ('sxhash-eql') on them will be the same.
1354 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
1355 consistency with the new functions. For compatibility, 'sxhash'
1356 remains as an alias to 'sxhash-equal'.
1359 ** 'make-hash-table' now defaults to a rehash threshold of 0.8125
1360 instead of 0.8, to avoid rounding glitches.
1363 ** New function 'add-variable-watcher' can be used to call a function
1364 when a symbol's value is changed. This is used to implement the new
1365 debugger command 'debug-on-variable-change'.
1368 ** Time conversion functions that accept a time zone rule argument now
1369 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
1370 OFFSET is a count of seconds east of Universal Time, and the string
1371 ABBR is a time zone abbreviation. The affected functions are
1372 'current-time-string', 'current-time-zone', 'decode-time',
1373 'format-time-string', and 'set-time-zone-rule'.
1376 ** 'format-time-string' now formats "%q" to the calendar quarter.
1378 ** New built-in function 'mapcan' which avoids unnecessary consing (and garbage
1382 ** 'car' and 'cdr' compositions 'cXXXr' and 'cXXXXr' are now part of Elisp.
1385 ** 'if-let*', 'when-let*', and 'and-let*' are new in subr-x.el.
1386 The incumbent 'if-let' and 'when-let' are now aliases.
1388 ** Low-level list functions like 'length' and 'member' now do a better
1389 job of signaling list cycles instead of looping indefinitely.
1392 ** The new functions 'make-nearby-temp-file' and 'temporary-file-directory'
1393 can be used for creation of temporary files of remote or mounted directories.
1396 ** The new function 'file-local-name' can be used to specify arguments
1397 of remote processes.
1400 ** The new functions 'file-name-quote', 'file-name-unquote' and
1401 'file-name-quoted-p' can be used to quote / unquote file names with
1405 ** The new error 'file-missing', a subcategory of 'file-error', is now
1406 signaled instead of 'file-error' if a file operation acts on a file
1407 that does not exist.
1410 ** The function 'delete-directory' no longer signals an error when
1411 operating recursively and when some other process deletes the directory
1412 or its files before 'delete-directory' gets to them.
1415 *** New error type 'user-search-failed' like 'search-failed' but
1416 avoids debugger like 'user-error'.
1419 ** The function 'line-number-at-pos' now takes a second optional
1420 argument 'absolute'. If this parameter is nil, the default, this
1421 function keeps on returning the line number taking potential narrowing
1422 into account. If this parameter is non-nil, the function ignores
1423 narrowing and returns the absolute line number.
1425 ** Changes in Frame- and Window- Handling
1428 *** Resizing a frame no longer runs 'window-configuration-change-hook'.
1429 'window-size-change-functions' should be used instead.
1432 *** The new function 'frame-size-changed-p' can tell whether a frame has
1433 been resized since the last time 'window-size-change-functions' has been
1437 *** The function 'frame-geometry' now also returns the width of a
1438 frame's outer border.
1441 *** New frame parameters and changed semantics for older ones
1444 **** 'z-group' positions a frame above or below all others.
1447 **** 'min-width' and 'min-height' specify the absolute minimum size of a
1451 **** 'parent-frame' makes a frame the child frame of another Emacs
1452 frame. The section "Child Frames" in the Elisp manual describes the
1453 intrinsics of that relationship.
1456 **** 'delete-before' triggers deletion of one frame before that of
1460 **** 'mouse-wheel-frame' specifies another frame whose windows shall be
1464 **** 'no-other-frame' has 'next-frame' and 'previous-frame' skip this
1468 **** 'skip-taskbar' removes a frame's icon from the taskbar and has
1469 Alt-<TAB> skip this frame.
1472 **** 'no-focus-on-map' avoids that a frame gets input focus when mapped.
1475 **** 'no-accept-focus' means that a frame does not want to get input
1476 focus via the mouse.
1479 **** 'undecorated' removes the window manager decorations from a frame.
1482 **** 'override-redirect' tells the window manager to disregard this
1486 **** 'width' and 'height' allow to specify pixel values and ratios now.
1489 **** 'left' and 'top' allow to specify ratios now.
1492 **** 'keep-ratio' preserves size and position of child frames when their
1493 parent frame is resized.
1496 **** 'no-special-glyphs' suppresses display of truncation and
1497 continuation glyphs in a frame.
1500 **** 'auto-hide-function' and 'minibuffer-exit' handle auto hiding of
1501 frames and exiting from minibuffer individually.
1504 **** 'fit-frame-to-buffer-margins' and 'fit-frame-to-buffer-sizes'
1505 handle fitting a frame to its buffer individually.
1508 **** 'drag-internal-border', 'drag-with-header-line',
1509 'drag-with-mode-line', 'snap-width', 'top-visible' and 'bottom-visible'
1510 allow to drag and resize frames with the mouse.
1512 *** The new function 'frame-list-z-order' returns a list of all frames
1513 in Z (stacking) order.
1516 *** The function 'x-focus-frame' optionally tries to not activate its
1520 *** The variable 'focus-follows-mouse' has a third meaningful value
1521 'auto-raise' to indicate that the window manager automatically raises a
1522 frame when the mouse pointer enters it.
1525 *** The new function 'frame-restack' puts a frame above or below
1526 another on the display.
1529 *** The new face 'internal-border' specifies the background of a frame's
1533 *** The NORECORD argument of 'select-window' now has a meaningful value
1534 'mark-for-redisplay' which is like any other non-nil value but marks
1535 WINDOW for redisplay.
1538 *** Support for side windows is now official. The display action
1539 function 'display-buffer-in-side-window' will display its buffer in a
1540 side window. Functions for toggling all side windows on a frame,
1541 changing and reversing the layout of side windows and returning the main
1542 (major non-side) window of a frame are provided. For details consult
1543 the section "Side Windows" in the Elisp manual.
1546 *** Support for atomic windows - rectangular compositions of windows
1547 treated by 'split-window', 'delete-window' and 'delete-other-windows'
1548 like a single live window - is now official. For details consult the
1549 section "Atomic Windows" in the Elisp manual.
1552 *** New 'display-buffer' alist entry 'window-parameters' allows to
1553 assign window parameters to the window used for displaying the buffer.
1556 *** New function 'display-buffer-reuse-mode-window' is an action function
1557 suitable for use in 'display-buffer-alist'. For example, to avoid creating
1558 a new window when opening man pages when there's already one, use
1559 (add-to-list 'display-buffer-alist
1560 '("\\`\\*Man .*\\*\\'" .
1561 (display-buffer-reuse-mode-window
1562 (inhibit-same-window . nil)
1563 (mode . Man-mode))))
1566 *** New window parameter 'no-delete-other-window' prevents that
1567 its window gets deleted by 'delete-other-windows'.
1570 *** New window parameters 'mode-line-format' and 'header-line-format'
1571 allow to override the buffer-local formats for this window.
1574 *** New command 'window-swap-states' swaps the states of two live
1578 *** New functions 'window-pixel-width-before-size-change' and
1579 'window-pixel-height-before-size-change' support detecting which
1580 window changed size when 'window-size-change-functions' are run.
1583 *** The new function 'window-lines-pixel-dimensions' returns the pixel
1584 dimensions of a window's text lines.
1587 *** The new function 'window-largest-empty-rectangle' returns the
1588 dimensions of the largest rectangular area not occupying any text in a
1592 *** The semantics of 'mouse-autoselect-window' has changed slightly.
1593 For details see the section "Mouse Window Auto-selection" in the Elisp
1597 ** 'tcl-auto-fill-mode' is now declared obsolete. Its functionality
1598 can be replicated simply by setting 'comment-auto-fill-only-comments'.
1600 ** New pcase pattern 'rx' to match against a rx-style regular
1604 * Changes in Emacs 26.1 on Non-Free Operating Systems
1606 ** Intercepting hotkeys on Windows 7 and later now works better.
1607 The new keyboard hooking code properly grabs system hotkeys such as
1608 Win-* and Alt-TAB, in a way that Emacs can get at them before the
1609 system. This makes the 'w32-register-hot-key' functionality work
1610 again on all versions of MS-Windows starting with Windows 7. On
1611 Windows NT and later you can now register any hotkey combination. (On
1612 Windows 9X, the previous limitations, spelled out in the Emacs manual,
1615 ** 'convert-standard-filename' no longer mirrors slashes on MS-Windows.
1616 Previously, on MS-Windows this function converted slash characters in
1617 file names into backslashes. It no longer does that. If your Lisp
1618 program used 'convert-standard-filename' to prepare file names to be
1619 passed to subprocesses (which is not the recommended usage of that
1620 function), you will now have to mirror slashes in your application
1621 code. One possible way is this:
1624 (while (string-match "/" file-name start)
1625 (aset file-name (match-beginning 0) ?\\)
1626 (setq start (match-end 0))))
1628 ** GUI sessions now treat SIGINT like Posix platforms do.
1629 The effect of delivering a Ctrl-C (SIGINT) signal to a GUI Emacs on
1630 MS-Windows is now the same as on Posix platforms -- Emacs saves the
1631 session and exits. In particular, this will happen if you start
1632 emacs.exe from the Windows shell, then type Ctrl-C into that shell's
1636 ** 'signal-process' supports SIGTRAP on Windows XP and later.
1637 The 'kill' emulation on Windows now maps SIGTRAP to a call to the
1638 'DebugBreakProcess' API. This causes the receiving process to break
1639 execution and return control to the debugger. If no debugger is
1640 attached to the receiving process, the call is typically ignored.
1641 This is in contrast to the default action on POSIX Systems, where it
1642 causes the receiving process to terminate with a core dump if no
1643 debugger has been attached to it.
1645 ** 'set-mouse-position' and 'set-mouse-absolute-pixel-position' work
1648 ** Emacs can now be run as a GUI application from the command line on
1652 ----------------------------------------------------------------------
1653 This file is part of GNU Emacs.
1655 GNU Emacs is free software: you can redistribute it and/or modify
1656 it under the terms of the GNU General Public License as published by
1657 the Free Software Foundation, either version 3 of the License, or
1658 (at your option) any later version.
1660 GNU Emacs is distributed in the hope that it will be useful,
1661 but WITHOUT ANY WARRANTY; without even the implied warranty of
1662 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
1663 GNU General Public License for more details.
1665 You should have received a copy of the GNU General Public License
1666 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
1672 paragraph-separate: "[
\f]*$"