1 GNU Emacs NEWS -- history of user-visible changes.
3 Copyright (C) 2014-2016 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 --enable-gcc-warnings=warn-only' causes
34 GCC to issue warnings without stopping the build. This behavior is
35 now the default in developer builds. As before, use
36 '--disable-gcc-warnings' to suppress GCC's warnings, and
37 '--enable-gcc-warnings' to stop the build if GCC issues warnings.
40 ** The Emacs server now has socket-launching support. This allows
41 socket based activation, where an external process like systemd can
42 invoke the Emacs server process upon a socket connection event and
43 hand the socket over to Emacs. Emacs uses this socket to service
44 emacsclient commands. This new functionality can be disabled with the
45 configure option '--disable-libsystemd'.
48 ** A systemd user unit file is provided. Use it in the standard way:
49 systemctl --user enable emacs
50 (If your Emacs is installed in a non-standard location, you may
51 need to copy the emacs.service file to eg ~/.config/systemd/user/)
53 ** New configure option '--disable-build-details' attempts to build an
54 Emacs that is more likely to be reproducible; that is, if you build
55 and install Emacs twice, the second Emacs is a copy of the first.
56 Deterministic builds omit the build date from the output of the
57 emacs-version and erc-cmd-SV functions, and the leave the following
58 variables nil: emacs-build-system, emacs-build-time,
61 ** Emacs no longer works on IRIX. We expect that Emacs users are not
62 affected by this, as SGI stopped supporting IRIX in December 2013.
65 * Startup Changes in Emacs 26.1
67 ** New option '--new-daemon'. This is the same as '--daemon', except
68 it runs in the foreground and does not fork. This is intended for
69 modern init systems such as systemd, which manage many of the traditional
70 aspects of daemon behavior themselves. '--old-daemon' is now an alias
74 * Changes in Emacs 26.1
77 ** The new function 'file-name-case-insensitive-p' tests whether a
78 given file is on a case-insensitive filesystem.
81 ** The new user variable 'electric-quote-chars' provides a list
82 of curved quotes for 'electric-quote-mode', allowing user to choose
83 the types of quotes to be used.
86 ** Emacs now uses double buffering to reduce flicker when editing and
87 resizing graphical Emacs frames on the X Window System. This support
88 requires the DOUBLE-BUFFER extension, which major X servers have
89 supported for many years.
92 The group 'wp', whose label was "text", is now deprecated.
93 Use the new group 'text', which inherits from 'wp', instead.
96 ** The new function 'call-shell-region' executes a command in an
97 inferior shell with the buffer region as input.
100 ** The new user option 'shell-command-dont-erase-buffer' controls
101 if the output buffer is erased between shell commands; if non-nil,
102 the output buffer is not erased; this variable also controls where
103 to set the point in the output buffer: beginning of the output,
104 end of the buffer or save the point.
105 When 'shell-command-dont-erase-buffer' is nil, the default value,
106 the behavior of 'shell-command', 'shell-command-on-region' and
107 'async-shell-command' is as usual.
110 ** The new user option 'mouse-select-region-move-to-beginning'
111 controls the position of point when double-clicking mouse-1 on the end
112 of a parenthetical grouping or string-delimiter: the default value nil
113 keeps point at the end of the region, setting it to non-nil moves
114 point to the beginning of the region.
117 ** The new user option 'confirm-kill-processes' allows the user to
118 skip a confirmation prompt for killing subprocesses when exiting
119 Emacs. When set to t (the default), Emacs will prompt for
120 confirmation before killing subprocesses on exit, which is the same
124 ** 'find-library-name' will now fall back on looking at 'load-history'
125 to try to locate libraries that have been loaded with an explicit path
129 ** Faces in 'minibuffer-prompt-properties' no longer overwrite properties
130 in the text in functions like 'read-from-minibuffer', but instead are
131 added to the end of the face list. This allows users to say things
132 like '(read-from-minibuffer (propertize "Enter something: " 'face 'bold))'.
135 ** The new variable 'extended-command-suggest-shorter' has been added
136 to control whether to suggest shorter 'M-x' commands or not.
139 ** icomplete now respects 'completion-ignored-extensions'.
142 ** Non-breaking hyphens are now displayed with the 'nobreak-hyphen'
143 face instead of the 'escape-glyph' face.
146 ** Approximations to quotes are now displayed with the new 'homoglyph'
147 face instead of the 'escape-glyph' face.
150 ** 'C-x h' ('mark-whole-buffer') will now avoid marking the prompt
154 ** 'find-library' now takes a prefix argument to pop to a different
158 ** 'process-attributes' on Darwin systems now returns more information.
161 ** Several accessors for the value returned by 'file-attributes'
162 have been added. They are: 'file-attribute-type',
163 'file-attribute-link-number', 'file-attribute-user-id',
164 'file-attribute-group-id', 'file-attribute-access-time',
165 'file-attribute-modification-time',
166 'file-attribute-status-change-time', 'file-attribute-size',
167 'file-attribute-modes', 'file-attribute-inode-number',
168 'file-attribute-device-number' and 'file-attribute-collect'.
171 ** The new function 'buffer-hash' computes a fast, non-consing hash of
175 ** 'fill-paragraph' no longer marks the buffer as changed unless it
176 actually changed something.
179 ** The locale language name 'ca' is now mapped to the language
180 environment 'Catalan', which has been added.
183 ** 'align-regexp' has a separate history for its interactive argument.
184 'align-regexp' no longer shares its history with all other
185 history-less functions that use 'read-string'.
188 ** The networking code has been reworked so that it's more
189 asynchronous than it was (when specifying :nowait t in
190 'make-network-process'). How asynchronous it is varies based on the
191 capabilities of the system, but on a typical GNU/Linux system the DNS
192 resolution, the connection, and (for TLS streams) the TLS negotiation
193 are all done without blocking the main Emacs thread. To get
194 asynchronous TLS, the TLS boot parameters have to be passed in (see
195 the manual for details).
197 Certain process oriented functions (like 'process-datagram-address')
198 will block until socket setup has been performed. The recommended way
199 to deal with asynchronous sockets is to avoid interacting with them
200 until they have changed status to "run". This is most easily done
201 from a process sentinel.
203 ** 'make-network-process' and 'open-network-stream' sometimes allowed
204 :service to be an integer string (e.g., :service "993") and sometimes
205 required an integer (e.g., :service 993). This difference has been
206 eliminated, and integer strings work everywhere.
208 ** It is possible to disable attempted recovery on fatal signals.
210 Two new variables support disabling attempts to recover from stack
211 overflow and to avoid automatic auto-save when Emacs is delivered a
212 fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
213 will disable attempts to recover from C stack overflows; Emacs will
214 then crash as with any other fatal signal.
215 'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
216 disable attempts to auto-save the session and shut down in an orderly
217 fashion when Emacs receives a fatal signal; instead, Emacs will
218 terminate immediately. Both variables are non-'nil' by default.
219 These variables are for users who would like to avoid the small
220 probability of data corruption due to techniques Emacs uses to recover
224 ** File local and directory local variables are now initialized each
225 time the major mode is set, not just when the file is first visited.
226 These local variables will thus not vanish on setting a major mode.
229 ** A second dir-local file (.dir-locals-2.el) is now accepted.
230 See the variable 'dir-locals-file-2' for more information.
233 ** Connection-local variables can be used to specify local variables
234 with a value depending on the connected remote server. For details,
235 see the node "Connection Local Variables" in the ELisp manual.
238 ** International domain names (IDNA) are now encoded via the new
239 puny.el library, so that one can visit web sites with non-ASCII URLs.
242 ** The new 'timer-list' command lists all active timers in a buffer,
243 where you can cancel them with the 'c' command.
246 ** The new function 'read-multiple-choice' prompts for multiple-choice
247 questions, with a handy way to display help texts.
250 ** 'switch-to-buffer-preserve-window-point' now defaults to t.
253 ** The new variable 'debugger-stack-frame-as-list' allows displaying
254 all call stack frames in a Lisp backtrace buffer as lists. Both
255 debug.el and edebug.el have been updated to heed to this variable.
258 ** The new variable 'x-ctrl-keysym' has been added to the existing
259 roster of X keysyms. It can be used in combination with another
260 variable of this kind to swap modifiers in Emacs.
263 ** New input methods: 'cyrillic-tuvan', 'polish-prefix'.
266 * Editing Changes in Emacs 26.1
269 ** New bindings for 'query-replace-map'.
270 'undo', undo the last replacement; bound to 'u'.
271 'undo-all', undo all replacements; bound to 'U'.
273 ** 'delete-trailing-whitespace' deletes whitespace after form feed.
274 In modes where form feed was treated as a whitespace character,
275 'delete-trailing-whitespace' would keep lines containing it unchanged.
276 It now deletes whitespace after the last form feed thus behaving the
277 same as in modes where the character is not whitespace.
279 ** No more prompt about changed file when the file's content is unchanged.
280 Instead of only checking the modification time, Emacs now also checks
281 the file's actual content before prompting the user.
284 * Changes in Specialized Modes and Packages in Emacs 26.1
286 ** Electric-Buffer-menu
289 *** Key 'U' is bound to 'Buffer-menu-unmark-all' and key 'M-DEL' is
290 bound to 'Buffer-menu-unmark-all-buffers'.
295 *** Two new commands 'bs-unmark-all', bound to 'U', and
296 'bs-unmark-previous', bound to <backspace>.
301 *** Two new commands 'Buffer-menu-unmark-all', bound to 'U' and
302 'Buffer-menu-unmark-all-buffers', bound to 'M-DEL'.
307 *** A new command 'ibuffer-copy-buffername-as-kill'; bound
311 *** New command 'ibuffer-change-marks'; bound to '* c'.
314 *** A new command 'ibuffer-mark-by-locked' to mark
315 all locked buffers; bound to '% L'.
318 *** A new option 'ibuffer-locked-char' to indicate
319 locked buffers; Ibuffer shows a new column displaying
320 'ibuffer-locked-char' for locked buffers.
323 *** A new command 'ibuffer-unmark-all-marks' to unmark
324 all buffers without asking confirmation; bound to
325 'U'; 'ibuffer-do-replace-regexp' bound to 'r'.
328 *** A new command 'ibuffer-mark-by-content-regexp' to mark buffers
329 whose content matches a regexp; bound to '% g'.
332 *** Two new options 'ibuffer-never-search-content-name' and
333 'ibuffer-never-search-content-mode' used by
334 'ibuffer-mark-by-content-regexp'.
338 *** Support for opening links to man pages in Man or WoMan mode.
343 *** New user option 'comint-move-point-for-matching-input' to control
344 where to place point after C-c M-r and C-c M-s.
349 *** Messages from CMake are now recognized.
354 *** A new option 'dired-always-read-filesystem' default to nil.
355 If non-nil, buffers visiting files are reverted before search them;
356 for instance, in 'dired-mark-files-containing-regexp' a non-nil value
357 of this option means the file is revisited in a temporary buffer;
358 this temporary buffer is the actual buffer searched: the original buffer
359 visiting the file is not modified.
362 *** In wdired, when editing files to contain slash characters,
363 the resulting directories are automatically created. Whether to do
364 this is controlled by the 'wdired-create-parent-directories' variable.
367 *** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
368 viewing HTML files and the like.
372 *** Edebug can be prevented from pausing 1 second after reaching a
373 breakpoint (e.g. with "f" and "o") by customizing the new option
374 'edebug-sit-on-break'.
378 *** 'eshell-input-filter's value is now a named function
379 'eshell-input-filter-default', and has a new custom option
380 'eshell-input-filter-initial-space' to ignore adding commands prefixed
381 with blank space to eshell history.
386 *** New 'M-RET' command for opening a link at point in a new eww buffer.
389 *** A new 's' command for switching to another eww buffer via the minibuffer.
392 *** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
393 with the 'o' command from 'image-map'.
396 *** A new command 'C' ('eww-toggle-colors') can be used to toggle
397 whether to use the HTML-specified colors or not. The user can also
398 customize the 'shr-use-colors' variable.
401 *** Images that are being loaded are now marked with gray
402 "placeholder" images of the size specified by the HTML. They are then
403 replaced by the real images asynchronously, which will also now
404 respect width/height HTML specs (unless they specify widths/heights
405 bigger than the current window).
410 *** Images are automatically scaled before displaying based on the
411 'image-scaling-factor' variable (if Emacs supports scaling the images
415 *** Images inserted with 'insert-image' and related functions get a
416 keymap put into the text properties (or overlays) that span the
417 image. This keymap binds keystrokes for manipulating size and
418 rotation, as well as saving the image to a file. These commands are
419 also available in 'image-mode'.
422 *** A new library for creating and manipulating SVG images has been
423 added. See the "SVG Images" section in the Lisp reference manual for
427 *** New setf-able function to access and set image parameters is
428 provided: 'image-property'.
431 ** The default 'Info-default-directory-list' no longer checks some obsolete
432 directory suffixes (gnu, gnu/lib, gnu/lib/emacs, emacs, lib, lib/emacs)
433 when searching for info directories.
436 ** The commands that add ChangeLog entries now prefer a VCS root directory
437 for the ChangeLog file, if none already exists. Customize
438 'change-log-directory-files' to nil for the old behavior.
441 ** Support for non-string values of 'time-stamp-format' has been removed.
446 *** 'message-use-idna' now defaults to t (because Emacs comes with
447 built-in IDNA support now).
450 *** When sending HTML messages with embedded images, and you have
451 exiftool installed, and you rotate images with EXIF data (i.e.,
452 JPEGs), the rotational information will be inserted into the outgoing
453 image in the message. (The original image will not have its
454 orientation affected.)
457 *** The 'message-valid-fqdn-regexp' variable has been removed, since
458 there are now top-level domains added all the time. Message will no
459 longer warn about sending emails to top-level domains it hasn't heard
462 *** 'message-beginning-of-line' (bound to C-a) understands folded headers.
463 In 'visual-line-mode' it will look for the true beginning of a header
464 while in non-'visual-line-mode' it will move the point to the indented
470 *** New connection method "sg", which supports editing files under a
474 *** New connection method "doas" for OpenBSD hosts.
477 *** New connection method "gdrive", which allows to access Google
478 Drive onsite repositories.
481 Setting the "ENV" environment variable in 'tramp-remote-process-environment'
482 enables reading of shell initialization files.
485 ** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
490 *** Support for completing attribute values, at-rules, bang-rules,
491 HTML tags, classes and IDs using the 'completion-at-point' command.
492 Completion candidates for HTML classes and IDs are retrieved from open
496 ** Emacs now supports character name escape sequences in character and
497 string literals. The syntax variants \N{character name} and
498 \N{U+code} are supported.
501 ** Prog mode has some support for multi-mode indentation.
502 This allows better indentation support in modes that support multiple
503 programming languages in the same buffer, like literate programming
504 environments or ANTLR programs with embedded Python code.
506 A major mode can provide indentation context for a sub-mode through
507 the 'prog-indentation-context' variable. To support this, modes that
508 provide indentation should use 'prog-widen' instead of 'widen' and
509 'prog-first-column' instead of a literal zero. See the node
510 "Mode-Specific Indent" in the ELisp manual for more details.
514 *** New variable 'erc-default-port-tls' used to connect to TLS IRC
520 *** The new function 'url-cookie-delete-cookie' can be used to
521 programmatically delete all cookies, or cookies from a specific
525 *** 'url-retrieve-synchronously' now takes an optional timeout parameter.
528 *** The URL package now support HTTPS over proxies supporting CONNECT.
531 *** 'url-user-agent' now defaults to 'default', and the User-Agent
532 string is computed dynamically based on 'url-privacy-level'.
534 ** VC and related modes
537 *** The VC state indicator in the mode line now defaults to more
538 colorful faces to make it more obvious to the user what the state is.
539 See the 'vc-faces' customization group.
543 *** Opening a .h file will turn C or C++ mode depending on language used.
544 This is done with the help of 'c-or-c++-mode' function which analyses
545 contents of the buffer to determine whether it's a C or C++ source
551 *** Emacs does no longer prompt the user before killing Flymake
555 * New Modes and Packages in Emacs 26.1
557 ** New Elisp data-structure library 'radix-tree'.
560 * Incompatible Lisp Changes in Emacs 26.1
563 ** Resizing a frame no longer runs 'window-configuration-change-hook'.
564 Put your function on 'window-size-change-functions' instead.
566 ** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
567 mode to send the same escape sequences that xterm does. This makes
568 things like forward-word in readline work.
571 ** hideshow mode got four key bindings that are analogous to outline
572 mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
574 ** The grep/rgrep/lgrep functions will now ask about saving files
575 before running. This is controlled by the 'grep-save-buffers'
578 ** Some obsolete functions, variables, and faces have been removed:
579 *** From subr.el: window-dot, set-window-dot, read-input, show-buffer,
580 eval-current-buffer, string-to-int
581 *** All the default-FOO variables that hold the default value of the
582 FOO variable. Use 'default-value' and 'setq-default' to access and
583 change FOO, respectively. The exhaustive list of removed variables is:
584 'default-mode-line-format', 'default-header-line-format',
585 'default-line-spacing', 'default-abbrev-mode', 'default-ctl-arrow',
586 'default-truncate-lines', 'default-left-margin', 'default-tab-width',
587 'default-case-fold-search', 'default-left-margin-width',
588 'default-right-margin-width', 'default-left-fringe-width',
589 'default-right-fringe-width', 'default-fringes-outside-margins',
590 'default-scroll-bar-width', 'default-vertical-scroll-bar',
591 'default-indicate-empty-lines', 'default-indicate-buffer-boundaries',
592 'default-fringe-indicator-alist', 'default-fringe-cursor-alist',
593 'default-scroll-up-aggressively', 'default-scroll-down-aggressively',
594 'default-fill-column', 'default-cursor-type',
595 'default-cursor-in-non-selected-windows',
596 'default-buffer-file-coding-system', 'default-major-mode', and
597 'default-enable-multibyte-characters'.
598 *** Many variables obsoleted in 22.1 referring to face symbols
601 ** The variable 'text-quoting-style' no longer affects the treatment
602 of curved quotes in format arguments to functions like 'message' and
603 'format-message'. In particular, when this variable's value is
604 'grave', all quotes in formats are output as-is.
606 ** Functions like 'check-declare-file' and 'check-declare-directory'
607 now generate less chatter and more-compact diagnostics. The auxiliary
608 function 'check-declare-errmsg' has been removed.
611 * Lisp Changes in Emacs 26.1
613 ** New function 'undo-amalgamate-change-group' to get rid of
614 undo-boundaries between two states.
616 ** New var 'definition-prefixes' is a hash table mapping prefixes to
617 the files where corresponding definitions can be found. This can be
618 used to fetch definitions that are not yet loaded, for example for
621 ** New var 'syntax-ppss-table' to control the syntax-table used in
625 ** 'define-derived-mode' can now specify an :after-hook form, which
626 gets evaluated after the new mode's hook has run. This can be used to
627 incorporate configuration changes made in the mode hook into the
630 ** Autoload files can be generated without timestamps,
631 by setting 'autoload-timestamps' to nil.
632 FIXME As an experiment, nil is the current default.
633 If no insurmountable problems before next release, it can stay that way.
636 ** 'gnutls-boot' now takes a parameter ':complete-negotiation' that
637 says that negotiation should complete even on non-blocking sockets.
640 ** New functions 'window-pixel-width-before-size-change' and
641 'window-pixel-height-before-size-change' support detecting which
642 window changed size when 'window-size-change-functions' are run.
645 ** New function 'display-buffer-reuse-mode-window' is an action function
646 suitable for use in 'display-buffer-alist'. For example, to avoid creating
647 a new window when opening man pages when there's already one, use
648 (add-to-list 'display-buffer-alist
649 '("\\`\\*Man .*\\*\\'" .
650 (display-buffer-reuse-mode-window
651 (inhibit-same-window . nil)
655 ** There is now a new variable 'flyspell-sort-corrections-function'
656 that allows changing the way corrections are sorted.
659 ** The new command 'fortune-message' has been added, which displays
660 fortunes in the echo area.
663 ** New function 'func-arity' returns information about the argument list
664 of an arbitrary function. This generalizes 'subr-arity' for functions
665 that are not built-in primitives. We recommend using this new
666 function instead of 'subr-arity'.
669 ** 'parse-partial-sexp' state has a new element. Element 10 is
670 non-nil when the last character scanned might be the first character
671 of a two character construct, i.e., a comment delimiter or escaped
672 character. Its value is the syntax of that last character.
675 ** 'parse-partial-sexp's state, element 9, has now been confirmed as
676 permanent and documented, and may be used by Lisp programs. Its value
677 is a list of currently open parenthesis positions, starting with the
678 outermost parenthesis.
681 ** 'read-color' will now display the color names using the color itself
682 as the background color.
684 ** The function 'redirect-debugging-output' now works on platforms
685 other than GNU/Linux.
688 ** The new function 'string-version-lessp' compares strings by
689 interpreting consecutive runs of numerical characters as numbers, and
690 compares their numerical values. According to this predicate,
691 "foo2.png" is smaller than "foo12.png".
694 ** The new function 'char-from-name' converts a Unicode name string
695 to the corresponding character code.
698 ** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
699 Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
700 two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
701 ('sxhash-eql') on them will be the same.
704 ** Function 'sxhash' has been renamed to 'sxhash-equal' for
705 consistency with the new functions. For compatibility, 'sxhash'
706 remains as an alias to 'sxhash-equal'.
709 ** Time conversion functions that accept a time zone rule argument now
710 allow it to be OFFSET or a list (OFFSET ABBR), where the integer
711 OFFSET is a count of seconds east of Universal Time, and the string
712 ABBR is a time zone abbreviation. The affected functions are
713 'current-time-string', 'current-time-zone', 'decode-time',
714 'format-time-string', and 'set-time-zone-rule'.
717 ** 'format-time-string' now formats "%q" to the calendar quarter.
719 ** New built-in function 'mapcan' which avoids unnecessary consing (and garbage
723 ** The new functions 'make-nearby-temp-file' and 'temporary-file-directory'
724 can be used for creation of temporary files of remote or mounted directories.
727 ** The new function 'file-local-name' can be used to specify arguments
731 ** The new error 'file-missing', a subcategory of 'file-error', is now
732 signaled instead of 'file-error' if a file operation acts on a file
736 ** The function 'delete-directory' no longer signals an error when
737 operating recursively and when some other process deletes the directory
738 or its files before 'delete-directory' gets to them.
740 ** Changes in Frame- and Window- Handling
743 *** Support for side windows is now official. The display action
744 function 'display-buffer-in-side-window' will display its buffer in a
745 side window. Functions for toggling all side windows on a frame,
746 changing and reversing the layout of side windows and returning the main
747 (major non-side) window of a frame are provided. For details consult
748 the section "Side Windows" in the Elisp manual.
751 *** Support for atomic windows - rectangular compositions of windows
752 treated by 'split-window', 'delete-window' and 'delete-other-windows'
753 like a single live window - is now official. For details consult the
754 section "Atomic Windows" in the Elisp manual.
757 *** New 'display-buffer' alist entry 'window-parameters' allows to
758 assign window parameters to the window used for displaying the buffer.
761 *** New window parameter 'no-delete-other-window' prevents that
762 its window gets deleted by 'delete-other-windows'.
765 *** New command 'window-swap-states' swaps the states of two live
769 * Changes in Emacs 26.1 on Non-Free Operating Systems
771 ** Intercepting hotkeys on Windows 7 and later now works better.
772 The new keyboard hooking code properly grabs system hotkeys such as
773 Win-* and Alt-TAB, in a way that Emacs can get at them before the
774 system. This makes the 'w32-register-hot-key' functionality work
775 again on all versions of MS-Windows starting with Windows 7. On
776 Windows NT and later you can now register any hotkey combination. (On
777 Windows 9X, the previous limitations, spelled out in the Emacs manual,
780 ** 'convert-standard-filename' no longer mirrors slashes on MS-Windows.
781 Previously, on MS-Windows this function converted slash characters in
782 file names into backslashes. It no longer does that. If your Lisp
783 program used 'convert-standard-filename' to prepare file names to be
784 passed to subprocesses (which is not the recommended usage of that
785 function), you will now have to mirror slashes in your application
786 code. One possible way is this:
789 (while (string-match "/" file-name start)
790 (aset file-name (match-beginning 0) ?\\)
791 (setq start (match-end 0))))
793 ** GUI sessions now treat SIGINT like Posix platforms do.
794 The effect of delivering a Ctrl-C (SIGINT) signal to a GUI Emacs on
795 MS-Windows is now the same as on Posix platforms -- Emacs saves the
796 session and exits. In particular, this will happen if you start
797 emacs.exe from the Windows shell, then type Ctrl-C into that shell's
801 ** 'signal-process' supports SIGTRAP on Windows XP and later.
802 The 'kill' emulation on Windows now maps SIGTRAP to a call to the
803 'DebugBreakProcess' API. This causes the receiving process to break
804 execution and return control to the debugger. If no debugger is
805 attached to the receiving process, the call is typically ignored.
806 This is in contrast to the default action on POSIX Systems, where it
807 causes the receiving process to terminate with a core dump if no
808 debugger has been attached to it.
811 ----------------------------------------------------------------------
812 This file is part of GNU Emacs.
814 GNU Emacs is free software: you can redistribute it and/or modify
815 it under the terms of the GNU General Public License as published by
816 the Free Software Foundation, either version 3 of the License, or
817 (at your option) any later version.
819 GNU Emacs is distributed in the hope that it will be useful,
820 but WITHOUT ANY WARRANTY; without even the implied warranty of
821 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
822 GNU General Public License for more details.
824 You should have received a copy of the GNU General Public License
825 along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
831 paragraph-separate: "[
\f]*$"