When you add a new item, use the appropriate mark if you are sure it applies,
otherwise leave it unmarked.
+\f
+* Installation Changes in Emacs 25.2
+
+** The new option 'configure --enable-gcc-warnings=warn-only' causes
+GCC to issue warnings without stopping the build. This behavior is
+now the default in developer builds. As before, use
+'--disable-gcc-warnings' to suppress GCC's warnings, and
+'--enable-gcc-warnings' to stop the build if GCC issues warnings.
+
++++
+** The Emacs server now has socket-launching support. This allows
+socket based activation, where an external process like systemd can
+invoke the Emacs server process upon a socket connection event and
+hand the socket over to Emacs. Emacs uses this socket to service
+emacsclient commands. This new functionality can be disabled with the
+configure option '--disable-libsystemd'.
+
+** New configure option '--disable-build-details' attempts to build an
+Emacs that is more likely to be reproducible; that is, if you build
+and install Emacs twice, the second Emacs is a copy of the first.
+Deterministic builds omit the build date from the output of the
+emacs-version and erc-cmd-SV functions, and the leave the following
+variables nil: emacs-build-system, emacs-build-time,
+erc-emacs-build-time.
+
+** Emacs no longer works on IRIX. We expect that Emacs users are not
+affected by this, as SGI stopped supporting IRIX in December 2013.
+
+\f
+* Startup Changes in Emacs 25.2
+
+\f
+* Changes in Emacs 25.2
+
+---
+** `find-library-name' will now fall back on looking at `load-history'
+to try to locate libraries that have been loaded with an explicit path
+outside `load-path'.
+
++++
+** Faces in `minibuffer-prompt-properties' no longer overwrite properties
+in the text in functions like `read-from-minibuffer', but instead are
+added to the end of the face list. This allows users to say things
+like `(read-from-minibuffer (propertize "Enter something: " 'face 'bold))'.
+
++++
+** The new variable `extended-command-suggest-shorter' has been added
+to control whether to suggest shorter `M-x' commands or not.
+
+---
+** icomplete now respects `completion-ignored-extensions'.
+
++++
+** Non-breaking hypens are now displayed with the `nobreak-hyphen'
+face instead of the `escape-glyph' face.
+
+---
+** `C-x h' (`mark-whole-buffer') will now avoid marking the prompt
+part of minibuffers.
+
+---
+** `find-library' now takes a prefix argument to pop to a different
+window.
+
+** `find-library', `help-function-def' and `help-variable-def' now run
+`find-function-after-hook'.
+
+---
+** 'process-attributes' on Darwin systems now returns more information.
+
++++
+** Several accessors for the value returned by 'file-attributes'
+have been added. They are: 'file-attribute-type',
+'file-attribute-link-number', 'file-attribute-user-id',
+'file-attribute-group-id', 'file-attribute-access-time',
+'file-attribute-modification-time',
+'file-attribute-status-change-time', 'file-attribute-size',
+'file-attribute-modes', 'file-attribute-inode-number', and
+'file-attribute-device-number'.
+
++++
+** The new function 'buffer-hash' computes compute a fast, non-consing
+hash of a buffer's contents.
+
+---
+** 'fill-paragraph' no longer marks the buffer as changed unless it
+actually changed something.
+
+---
+** The locale language name 'ca' is now mapped to the language
+environment 'Catalan', which has been added.
+
+---
+** 'align-regexp' has a separate history for its interactive argument.
+'align-regexp' no longer shares its history with all other
+history-less functions that use 'read-string'.
+
++++
+** The networking code has been reworked so that it's more
+asynchronous than it was (when specifying :nowait t in
+'make-network-process'). How asynchronous it is varies based on the
+capabilities of the system, but on a typical GNU/Linux system the DNS
+resolution, the connection, and (for TLS streams) the TLS negotiation
+are all done without blocking the main Emacs thread. To get
+asynchronous TLS, the TLS boot parameters have to be passed in (see
+the manual for details).
+
+Certain process oriented functions (like 'process-datagram-address')
+will block until socket setup has been performed. The recommended way
+to deal with asynchronous sockets is to avoid interacting with them
+until they have changed status to "run". This is most easily done
+from a process sentinel.
+
+** 'make-network-process' and 'open-network-stream' sometimes allowed
+:service to be an integer string (e.g., :service "993") and sometimes
+required an integer (e.g., :service 993). This difference has been
+eliminated, and integer strings work everywhere.
+
+** It is possible to disable attempted recovery on fatal signals.
+
+Two new variables support disabling attempts to recover from stack
+overflow and to avoid automatic auto-save when Emacs is delivered a
+fatal signal. 'attempt-stack-overflow-recovery', if set to 'nil',
+will disable attempts to recover from C stack overflows; Emacs will
+then crash as with any other fatal signal.
+'attempt-orderly-shutdown-on-fatal-signal', if set to 'nil', will
+disable attempts to auto-save the session and shut down in an orderly
+fashion when Emacs receives a fatal signal; instead, Emacs will
+terminate immediately. Both variables are non-'nil' by default.
+These variables are for users who would like to avoid the small
+probability of data corruption due to techniques Emacs uses to recover
+in these situations.
+
++++
+** A second dir-local file (.dir-locals-2.el) is now accepted.
+See the variable 'dir-locals-file-2' for more information.
+
+---
+** International domain names (IDNA) are now encoded via the new
+puny.el library, so that one can visit web sites with non-ASCII URLs.
+
++++
+** The new 'timer-list' command lists all active timers in a buffer,
+where you can cancel them with the 'c' command.
+
++++
+** The new function 'read-multiple-choice' prompts for multiple-choice
+questions, with a handy way to display help texts.
+
+\f
+* Editing Changes in Emacs 25.2
+
++++
+** New bindings for 'query-replace-map'.
+'undo', undo the last replacement; bound to 'u'.
+'undo-all', undo all replacements; bound to 'U'.
+
+\f
+* Changes in Specialized Modes and Packages in Emacs 25.2
+
+** Compilation mode
+
+---
+*** Messages from CMake are now recognized.
+
+** Dired
+
++++
+*** In wdired, when editing files to contain slash characters,
+the resulting directories are automatically created. Whether to do
+this is controlled by the 'wdired-create-parent-directories' variable.
+
++++
+*** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
+viewing HTML files and the like.
+
+** eww
+
++++
+*** A new 's' command for switching to another eww buffer via the minibuffer.
+
+---
+*** The 'o' command ('shr-save-contents') has moved to 'O' to avoid collision
+with the 'o' command from 'image-map'.
+
++++
+*** A new command 'C' ('eww-toggle-colors') can be used to toggle
+whether to use the HTML-specified colors or not. The user can also
+customize the 'shr-use-colors' variable.
+
+---
+*** Images that are being loaded are now marked with gray
+"placeholder" images of the size specified by the HTML. They are then
+replaced by the real images asynchronously, which will also now
+respect width/height HTML specs (unless they specify widths/heights
+bigger than the current window).
+
+** Images
+
++++
+*** Images are automatically scaled before displaying based on the
+'image-scaling-factor' variable (if Emacs supports scaling the images
+in question).
+
++++
+*** Images inserted with 'insert-image' and related functions get a
+keymap put into the text properties (or overlays) that span the
+image. This keymap binds keystrokes for manipulating size and
+rotation, as well as saving the image to a file. These commands are
+also available in 'image-mode'.
+
++++
+*** A new library for creating and manipulating SVG images has been
+added. See the "SVG Images" section in the lispref manual for
+details.
+
++++
+*** New setf-able function to access and set image parameters is
+provided: 'image-property'.
+
++++
+** The commands that add ChangeLog entries now prefer a VCS root directory
+for the ChangeLog file, if none already exists. Customize
+'change-log-directory-files' to nil for the old behavior.
+
+---
+** Support for non-string values of 'time-stamp-format' has been removed.
+
+** Message
+
+---
+*** 'message-use-idna' now defaults to t (because Emacs comes with
+built-in IDNA support now).
+
+---
+*** The 'message-valid-fqdn-regexp' variable has been removed, since
+there are now top-level domains added all the time. Message will no
+longer warn about sending emails to top-level domains it hasn't heard
+about.
+
+*** 'message-beginning-of-line' (bound to C-a) understands folded headers.
+In 'visual-line-mode' it will look for the true beginning of a header
+while in non-'visual-line-mode' it will move the point to the indented
+header's value.
+
+** Tramp
+
++++
+*** New connection method "sg", which supports editing files under a
+different group ID.
+
++++
+*** New connection method "doas" for OpenBSD hosts.
+
+---
+** 'auto-revert-use-notify' is set back to t in 'global-auto-revert-mode'.
+
+** CSS mode
+
+---
+*** Support for completing attribute values and bang-rules using the
+'completion-at-point' command.
+
++++
+** Emacs now supports character name escape sequences in character and
+string literals. The syntax variants \N{character name} and
+\N{U+code} are supported.
+
++++
+** Prog mode has some support for multi-mode indentation.
+This allows better indentation support in modes that support multiple
+programming languages in the same buffer, like literate programming
+environments or ANTLR programs with embedded Python code.
+
+A major mode can provide indentation context for a sub-mode through
+the 'prog-indentation-context' variable. To support this, modes that
+provide indentation should use 'prog-widen' instead of 'widen' and
+'prog-first-column' instead of a literal zero. See the node
+"Mode-Specific Indent" in the ELisp manual for more details.
+
+** ERC
+
+*** New variable 'erc-default-port-tls' used to connect to TLS IRC
+servers.
+
+** URL
+
++++
+*** The new function 'url-cookie-delete-cookie' can be used to
+programmatically delete all cookies, or cookies from a specific
+domain.
+
++++
+*** `url-retrieve-synchronously' now takes an optional timeout parameter.
+
+---
+*** The URL package now support HTTPS over proxies supporting CONNECT.
+
++++
+*** 'url-user-agent' now defaults to 'default', and the User-Agent
+string is computed dynamically based on 'url-privacy-level'.
+
+** VC and related modes
+
+---
+*** The VC state indicator in the mode line now defaults to more
+colorful faces to make it more obvious to the user what the state is.
+See the 'vc-faces' customization group.
+
+\f
+* New Modes and Packages in Emacs 25.2
+
+\f
+* Incompatible Lisp Changes in Emacs 25.2
+
++++
+** Resizing a frame no longer runs 'window-configuration-change-hook'.
+Put your function on 'window-size-change-functions' instead.
+
+** 'C-up', 'C-down', 'C-left' and 'C-right' are now defined in term
+mode to send the same escape sequences that xterm does. This makes
+things like forward-word in readline work.
+
+---
+** hideshow mode got four key bindings that are analogous to outline
+mode bindings: 'C-c @ C-a', 'C-c @ C-t', 'C-c @ C-d', and 'C-c @ C-e.'
+
+** The grep/rgrep/lgrep functions will now ask about saving files
+before running. This is controlled by the 'grep-save-buffers'
+variable.
+
+\f
+* Lisp Changes in Emacs 25.2
+
+** New var syntax-ppss-table to control the syntax-table used in syntax-ppss.
+
+** Autoload files can be generated without timestamps,
+by setting 'autoload-timestamps' to nil.
+FIXME As an experiment, nil is the current default.
+If no insurmountable problems before next release, it can stay that way.
+
+** 'ert-with-function-mocked' of 'ert-x package allows mocking of functions
+in unit tests.
+
+---
+** 'gnutls-boot' now takes a parameter :complete-negotiation that says
+that negotiation should complete even on non-blocking sockets.
+
++++
+** New functions 'window-pixel-width-before-size-change' and
+'window-pixel-height-before-size-change' support detecting which
+window changed size when 'window-size-change-functions' are run.
+
++++
+** New function 'display-buffer-reuse-mode-window' is an action function
+suitable for use in 'display-buffer-alist'. For example, to avoid creating
+a new window when opening man pages when there's already one, use
+(add-to-list 'display-buffer-alist
+ '("\\`\\*Man .*\\*\\'" .
+ (display-buffer-reuse-mode-window
+ (inhibit-same-window . nil)
+ (mode . Man-mode))))
+
+---
+** There is now a new variable 'flyspell-sort-corrections-function'
+that allows changing the way corrections are sorted.
+
+---
+** The new command 'fortune-message' has been added, which displays
+fortunes in the echo area.
+
++++
+** New function 'func-arity' returns information about the argument list
+of an arbitrary function. This generalizes 'subr-arity' for functions
+that are not built-in primitives. We recommend using this new
+function instead of 'subr-arity'.
+
++++
+** 'parse-partial-sexp' state has a new element. Element 10 is
+non-nil when the last character scanned might be the first character
+of a two character construct, i.e., a comment delimiter or escaped
+character. Its value is the syntax of that last character.
+
++++
+** 'parse-partial-sexp''s state, element 9, has now been confirmed as
+permanent and documented, and may be used by Lisp programs. Its value
+is a list of currently open parenthesis positions, starting with the
+outermost parenthesis.
+
+---
+** 'read-color' will now display the color names using the color itself
+as the background color.
+
+** The function 'redirect-debugging-output' now works on platforms
+other than GNU/Linux.
+
++++
+** The new function 'string-version-lessp' compares strings by
+interpreting consecutive runs of numerical characters as numbers, and
+compares their numerical values. According to this predicate,
+"foo2.png" is smaller than "foo12.png".
+
++++
+** The new function 'char-from-name' converts a Unicode name string
+to the corresponding character code.
+
++++
+** New functions 'sxhash-eq' and 'sxhash-eql' return hash codes of a
+Lisp object suitable for use with 'eq' and 'eql' correspondingly. If
+two objects are 'eq' ('eql'), then the result of 'sxhash-eq'
+('sxhash-eql') on them will be the same.
+
++++
+** Function 'sxhash' has been renamed to 'sxhash-equal' for
+consistency with the new functions. For compatibility, 'sxhash'
+remains as an alias to 'sxhash-equal'.
+
++++
+** Time conversion functions that accept a time zone rule argument now
+allow it to be OFFSET or a list (OFFSET ABBR), where the integer
+OFFSET is a count of seconds east of Universal Time, and the string
+ABBR is a time zone abbreviation. The affected functions are
+'current-time-string', 'current-time-zone', 'decode-time',
+'format-time-string', and 'set-time-zone-rule'.
+
+\f
+* Changes in Emacs 25.2 on Non-Free Operating Systems
+
+** Intercepting hotkeys on Windows 7 and later now works better.
+The new keyboard hooking code properly grabs system hotkeys such as
+Win-* and Alt-TAB, in a way that Emacs can get at them before the
+system. This makes the 'w32-register-hot-key' functionality work
+again on all versions of MS-Windows starting with Windows 7. On
+Windows NT and later you can now register any hotkey combination. (On
+Windows 9X, the previous limitations, spelled out in the Emacs manual,
+still apply.)
+
+** `convert-standard-filename' no longer mirrors slashes on MS-Windows.
+Previously, on MS-Windows this function converted slash characters in
+file names into backslashes. It no longer does that.
+
\f
* Installation Changes in Emacs 25.1