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* etc/NEWS: Mark entries according to documentation.

* doc/lispref/functions.texi (Mapping Functions): Document 'mapcan'.
This commit is contained in:
Eli Zaretskii 2017-08-30 19:23:59 +03:00
parent 9376ea3f6c
commit b3400d82d4
2 changed files with 150 additions and 108 deletions
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30
doc/lispref/functions.texi
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@ -930,11 +930,11 @@ the @code{call-interactively} function. @xref{Interactive Call}.
A @dfn{mapping function} applies a given function (@emph{not} a
special form or macro) to each element of a list or other collection.
Emacs Lisp has several such functions; this section describes
@code{mapcar}, @code{mapc}, and @code{mapconcat}, which map over a
list. @xref{Definition of mapatoms}, for the function @code{mapatoms}
which maps over the symbols in an obarray. @xref{Definition of
maphash}, for the function @code{maphash} which maps over key/value
associations in a hash table.
@code{mapcar}, @code{mapc}, @code{mapconcat}, and @code{mapcan}, which
map over a list. @xref{Definition of mapatoms}, for the function
@code{mapatoms} which maps over the symbols in an obarray.
@xref{Definition of maphash}, for the function @code{maphash} which
maps over key/value associations in a hash table.
These mapping functions do not allow char-tables because a char-table
is a sparse array whose nominal range of indices is very large. To map
@ -986,6 +986,26 @@ Return the list of results."
@end example
@end defun
@defun mapcan function sequence
This function applies @var{function} to each element of
@var{sequence}, like @code{mapcar}, but instead of collecting the
results into a list, it returns a single list with all the elements of
the results (which must be lists), by altering the results (using
@code{nconc}; @pxref{Rearrangement}). Like with @code{mapcar},
@var{sequence} can be of any type except a char-table.
@group
@example
;; @r{Contrast this:}
(mapcar 'list '(a b c d))
@result{} ((a) (b) (c) (d))
;; @r{with this:}
(mapcan 'list '(a b c d))
@result{} (a b c d)
@end example
@end group
@end defun
@defun mapc function sequence
@code{mapc} is like @code{mapcar} except that @var{function} is used for
side-effects only---the values it returns are ignored, not collected

228
etc/NEWS
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@ -152,6 +152,7 @@ given file is on a case-insensitive filesystem.
of curved quotes for 'electric-quote-mode', allowing user to choose
the types of quotes to be used.
---
** The new user option 'electric-quote-context-sensitive' makes
'electric-quote-mode' context sensitive. If it is non-nil, you can
type an ASCII apostrophe to insert an opening or closing quote,
@ -161,6 +162,7 @@ line, after a whitespace character, and after an opening parenthesis;
and it will replace the apostrophe by a closing quote character in all
other cases.
---
** The new variable 'electric-quote-inhibit-functions' controls when
to disable electric quoting based on context. Major modes can add
functions to this list; Emacs will temporarily disable
@ -270,9 +272,6 @@ part of minibuffers.
** 'find-library' now takes a prefix argument to pop to a different
window.
---
** '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',
@ -316,13 +315,14 @@ 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',
@ -337,11 +337,11 @@ probability of data corruption due to techniques Emacs uses to recover
in these situations.
+++
** 'interrupt-process' consults now the list
'interrupt-process-functions', which function has to be called in
order to deliver the SIGINT signal. This allows Tramp to send the
SIGINT signal to remote asynchronous processes. The hitherto existing
implementation has been moved to 'internal-default-interrupt-process'.
** 'interrupt-process' now consults the list 'interrupt-process-functions',
to determine which function has to be called in order to deliver the
SIGINT signal. This allows Tramp to send the SIGINT signal to remote
asynchronous processes. The hitherto existing implementation has been
moved to 'internal-default-interrupt-process'.
+++
** File local and directory local variables are now initialized each
@ -383,8 +383,7 @@ The old behaviour of using 'prin1' can be restored by customizing the
new option 'debugger-print-function'.
+++
** NUL bytes in strings copied to the system clipboard are now
replaced with "\0".
** NUL bytes in text copied to the system clipboard are now replaced with "\0".
+++
** The new variable 'x-ctrl-keysym' has been added to the existing
@ -418,14 +417,9 @@ want to reverse the direction of the scroll, customize
'mwheel-flip-direction'.
+++
** Emacsclient has a new option -u/--suppress-output. The option
suppresses display of return values from the server process.
---
** New user option 'dig-program-options' and extended functionality
for DNS-querying functions 'nslookup-host', 'dns-lookup-host',
and 'run-dig'. Each function now accepts an optional name server
argument interactively (with a prefix argument) and non-interactively.
** Emacsclient has a new option -u/--suppress-output.
This option suppresses display of return values from the server
process.
+++
** Emacsclient has a new option -T/--tramp.
@ -435,13 +429,21 @@ environment variable on a remote machine to emacsclient, and
use the local Emacs to edit remote files via Tramp. See the node
"emacsclient Options" in the user manual for the details.
---
** New user option 'dig-program-options' and extended functionality
for DNS-querying functions 'nslookup-host', 'dns-lookup-host',
and 'run-dig'. Each function now accepts an optional name server
argument interactively (with a prefix argument) and non-interactively.
+++
** 'describe-key-briefly' now ignores mouse movement events.
+++
** The new variable 'eval-expression-print-maximum-character' prevents
large integers from being displayed as characters.
large integers from being displayed as characters by 'M-:' and similar
commands.
---
** Two new commands for finding the source code of Emacs Lisp
libraries: 'find-library-other-window' and 'find-library-other-frame'.
@ -449,9 +451,11 @@ libraries: 'find-library-other-window' and 'find-library-other-frame'.
** The new variable 'display-raw-bytes-as-hex' allows to change the
display of raw bytes from octal to hex.
+++
** You can now provide explicit field numbers in format specifiers.
For example, '(format "%2$s %1$s" "X" "Y")' produces "Y X".
---
** 'comment-indent-function' values may now return a cons to specify a
range of indentation.
@ -465,48 +469,9 @@ minor mode or the global `global-display-line-numbers-mode'. When
using these modes, customize `display-line-numbers-type' with the same
value as you would use with `display-line-numbers'.
If `display-line-numbers' is set to t, Emacs will display the number
of each line before the line. If set to 'relative', Emacs will
display the line number relative to the line showing point, with that
line's number displayed as absolute. If set to 'visual', Emacs will
display a relative number for every screen line, i.e. it will count
screen lines rather than buffer lines. The default is nil, which
doesn't display the line numbers.
In 'relative' and 'visual' modes, the variable
'display-line-numbers-current-absolute' controls what number is
displayed for the line showing point. By default, this variable's
value is t, which means display the absolute line number for the line
showing point. Customizing this variable to a nil value will cause
Emacs to show zero instead, which preserves horizontal space of the
window in large buffers.
Line numbers are not displayed at all in minibuffer windows and in
tooltips, as they are not useful there.
The new face 'line-number' is used to display the line numbers. The
new face 'line-number-current-line' can be customized to display the
current line's number differently from all the other line numbers; by
default these two faces are identical.
You can also customize the new buffer-local variable
'display-line-numbers-width' to specify a fixed minimal with of the
area allocated to line-number display. The default is nil, meaning
that Emacs will dynamically calculate the area width, enlarging or
shrinking it as needed. Setting it to a non-negative integer
specifies that as the minimal width; selecting a value that is large
enough to display all line numbers in a buffer will then keep the
line-number display area of constant width at all times, if that is
desired.
When using `display-line-numbers-mode', you can customize the variable
`display-line-numbers-grow-only' to a non-nil value; this means that
Emacs may grow the above area width dynamically, but never shrink it.
Under this mode, customizing the variable
`display-line-numbers-width-start' to a non-nil value will cause Emacs
to set `display-line-numbers-width' to the minimum width necessary to
display all line numbers in the current buffer when first visiting it.
Lisp programs can disable line-number display for a particular screen
line by putting the 'display-line-numbers-disable' text property or
overlay property on the first character of that screen line. This is
@ -563,16 +528,19 @@ line in *Occur* buffer.
'undo', undo the last replacement; bound to 'u'.
'undo-all', undo all replacements; bound to 'U'.
---
** 'delete-trailing-whitespace' deletes whitespace after form feed.
In modes where form feed was treated as a whitespace character,
'delete-trailing-whitespace' would keep lines containing it unchanged.
It now deletes whitespace after the last form feed thus behaving the
same as in modes where the character is not whitespace.
** No more prompt about changed file when the file's content is unchanged.
Instead of only checking the modification time, Emacs now also checks
the file's actual content before prompting the user.
---
** Emacs no longer prompts about editing a changed file when the file's
content is unchanged. Instead of only checking the modification time,
Emacs now also checks the file's actual content before prompting the user.
---
** Various casing improvements.
*** 'upcase', 'upcase-region' et al. convert title case characters
@ -590,6 +558,7 @@ Strings such as ΌΣΟΣ are now correctly converted to Όσος when
capitalized instead of incorrect Όσοσ (compare lowercase sigma at the
end of the word).
+++
** Emacs can now auto-save buffers to visited files in a more robust
manner via the new mode 'auto-save-visited-mode'. Unlike
'auto-save-visited-file-name', this mode uses the normal saving
@ -605,6 +574,7 @@ Negative prefix arg flips the direction of selection. Also,
defun are selected unless they are separated from the defun by a blank
line.
---
** New command 'replace-buffer-contents'.
This command replaces the contents of the accessible portion of the
current buffer with the contents of the accessible portion of a
@ -626,6 +596,7 @@ paragraphs, for the purposes of bidirectional display.
* Changes in Specialized Modes and Packages in Emacs 26.1
---
** New function `cl-generic-p'.
** Dired
@ -638,22 +609,43 @@ remaining directories without more prompts.
*** Dired supports wildcards in the directory part of the file names.
+++
*** You can now use '`?`' in 'dired-do-shell-command'; as ' ? ', it gets replaced
by the current file name.
*** You can now use '`?`' in 'dired-do-shell-command'.
It gets replaced by the current file name, like ' ? '.
*** html2text is now marked obsolete.
+++
*** A new option 'dired-always-read-filesystem' default to nil.
If non-nil, buffers visiting files are reverted before search them;
for instance, in 'dired-mark-files-containing-regexp' a non-nil value
of this option means the file is revisited in a temporary buffer;
this temporary buffer is the actual buffer searched: the original buffer
visiting the file is not modified.
*** smerge-refine-regions can refine regions in separate buffers
+++
*** 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.
*** Info menu and index completion uses substring completion by default.
+++
*** 'W' is now bound to 'browse-url-of-dired-file', and is useful for
viewing HTML files and the like.
---
** html2text is now marked obsolete.
---
** smerge-refine-regions can refine regions in separate buffers
---
** Info menu and index completion uses substring completion by default.
This can be customized via the info-menu category in
completion-category-override.
+++
*** The ancestor buffer is shown by default in 3way merges.
** The ancestor buffer is shown by default in 3way merges.
A new option ediff-show-ancestor and a new toggle
ediff-toggle-show-ancestor.
---
** TeX: Add luatex and xetex as alternatives to pdftex
** Electric-Buffer-menu
@ -742,6 +734,7 @@ whose content matches a regexp; bound to '% g'.
** Browse-URL
---
*** Support for opening links to man pages in Man or WoMan mode.
** Comint
@ -760,23 +753,6 @@ where to place point after C-c M-r and C-c M-s.
displayed in the mode line. These are updated as compilation
proceeds.
+++
*** A new option 'dired-always-read-filesystem' default to nil.
If non-nil, buffers visiting files are reverted before search them;
for instance, in 'dired-mark-files-containing-regexp' a non-nil value
of this option means the file is revisited in a temporary buffer;
this temporary buffer is the actual buffer searched: the original buffer
visiting the file is not modified.
+++
*** 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.
** Grep
---
@ -785,12 +761,14 @@ available, which allows distinguishing the filename from contents if
they contain colons. This can be controlled by the new custom option
'grep-use-null-filename-separator'.
---
*** The grep/rgrep/lgrep functions will now ask about saving files
before running. This is controlled by the 'grep-save-buffers'
variable.
** Edebug
---
*** Edebug can be prevented from pausing 1 second after reaching a
breakpoint (e.g. with "f" and "o") by customizing the new option
'edebug-sit-on-break'.
@ -802,6 +780,7 @@ code.
** Eshell
---
*** 'eshell-input-filter's value is now a named function
'eshell-input-filter-default', and has a new custom option
'eshell-input-filter-initial-space' to ignore adding commands prefixed
@ -840,6 +819,7 @@ avoid accidentally accessing remote links may rebind 'w' and 'u' in
** Ido
---
*** The commands 'find-alternate-file-other-window',
'dired-other-window', 'dired-other-frame', and
'display-buffer-other-window' are now remapped to Ido equivalents if
@ -884,20 +864,25 @@ at image boundaries.
** Image-Dired
---
*** Now provides a minor mode 'image-dired-minor-mode' which replaces
the function 'image-dired-setup-dired-keybindings'.
---
*** Thumbnail generation is now asynchronous
The number of concurrent processes is limited by the variable
'image-dired-thumb-job-limit'.
---
*** 'image-dired-thumbnail-storage' has a new option 'standard-large'
for generating 256x256 thumbnails according to the Thumbnail Managing
Standard.
---
*** Inherits movement keys from 'image-mode' for viewing full images.
This includes the usual char, line, and page movement commands.
---
*** All the -options types have been changed to argument lists
instead of shell command strings. This change affects
'image-dired-cmd-create-thumbnail-options',
@ -909,8 +894,10 @@ instead of shell command strings. This change affects
'image-dired-cmd-pngnq-options', 'image-dired-cmd-pngcrush-options',
'image-dired-cmd-create-standard-thumbnail-options'
---
*** Recognizes more tools by default, including pngnq-s9 and OptiPNG
---
*** 'find-file' and related commands now work on thumbnails and
displayed images, providing a default argument of the original file name
via an addition to 'file-name-at-point-functions'.
@ -1054,6 +1041,7 @@ provide indentation should use 'prog-widen' instead of 'widen' and
** ERC
---
*** New variable 'erc-default-port-tls' used to connect to TLS IRC
servers.
@ -1087,6 +1075,7 @@ branch-related commands on a keymap bound to 'B'.
** CC mode
---
*** Opening a .h file will turn C or C++ mode depending on language used.
This is done with the help of 'c-or-c++-mode' function which analyses
contents of the buffer to determine whether it's a C or C++ source
@ -1110,8 +1099,7 @@ languages.
** Flymake
+++
*** Emacs does no longer prompt the user before killing Flymake
processes on exit.
*** Emacs no longer prompts the user before killing Flymake processes on exit.
* New Modes and Packages in Emacs 26.1
@ -1141,6 +1129,7 @@ editing Less files.
* Incompatible Lisp Changes in Emacs 26.1
---
*** password-data is now a hash-table
so that `password-read' can use any object for the `key' argument.
@ -1155,6 +1144,7 @@ table implementation. This uses a new bytecode op 'switch', which isn't
compatible with previous Emacs versions. This functionality can be disabled
by setting 'byte-compile-cond-use-jump-table' to nil.
---
** '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.
@ -1170,6 +1160,7 @@ Instead, text properties are added by query-replace-read-from.
Additionally, the new nil value restores pre-24.5 behavior
of not providing replacement pairs via the history.
---
** Some obsolete functions, variables, and faces have been removed:
*** make-variable-frame-local. Variables cannot be frame-local any more.
*** From subr.el: window-dot, set-window-dot, read-input, show-buffer,
@ -1200,6 +1191,7 @@ of curved quotes in format arguments to functions like 'message' and
'format-message'. In particular, when this variable's value is
'grave', all quotes in formats are output as-is.
---
** Functions like 'check-declare-file' and 'check-declare-directory'
now generate less chatter and more-compact diagnostics. The auxiliary
function 'check-declare-errmsg' has been removed.
@ -1211,17 +1203,18 @@ Standard #18. If you only want to match space and tab, use [ \t]
instead.
+++
** 'min' and 'max' no longer round their results. Formerly, they
returned a floating-point value if any argument was floating-point,
which was sometimes numerically incorrect. For example, on a 64-bit
host (max 1e16 10000000000000001) now returns its second argument
instead of its first.
** 'min' and 'max' no longer round their results.
Formerly, they returned a floating-point value if any argument was
floating-point, which was sometimes numerically incorrect. For
example, on a 64-bit host (max 1e16 10000000000000001) now returns its
second argument instead of its first.
+++
** The variable 'old-style-backquotes' has been made internal and
renamed to 'lread--old-style-backquotes'. No user code should use
this variable.
---
** To avoid confusion caused by "smart quotes", the reader no longer
accepts Lisp symbols which begin with the following quotation
characters: ‘’‛“”‟〞＂＇, unless they are escaped with backslash.
@ -1238,15 +1231,18 @@ longer quietly mutate the target of a local symbolic link, so that
Emacs can access and copy them reliably regardless of their contents.
The following changes are involved.
---
*** 'file-attributes' and 'file-symlink-p' no longer prepend "/:" to
symbolic links whose targets begin with "/" and contain ":". For
example, if a symbolic link "x" has a target "/y:z", (file-symlink-p
"x") now returns "/y:z" rather than "/:/y:z".
---
*** 'make-symbolic-link' no longer looks for file name handlers when
creating a local symbolic link. For example, (make-symbolic-link
"/y:z" "x") now creates a symlink to "/y:z" instead of failing.
+++
*** 'make-symbolic-link' now expands a link target with leading "~"
only when the optional third arg is an integer, as when invoked
interactively. For example, (make-symbolic-link "~y" "x") now creates
@ -1266,6 +1262,7 @@ break.
** The arguments LOCKNAME and MUSTBENEW of 'write-region' are
propagated to file name handlers now.
---
** When built against recent versions of GTK+, Emacs always uses
gtk_window_move for moving frames and ignores the value of the
variable 'x-gtk-use-window-move'. The variable is now obsolete.
@ -1273,13 +1270,16 @@ variable 'x-gtk-use-window-move'. The variable is now obsolete.
* Lisp Changes in Emacs 26.1
+++
** New optional argument TEXT in 'make-temp-file'.
---
** New function `define-symbol-prop'.
+++
** New optional argument TESTFN in 'alist-get', 'map-elt' and 'map-put'.
+++
** New function 'seq-set-equal-p' to check if SEQUENCE1 and SEQUENCE2
contain the same elements, regardless of the order.
@ -1309,19 +1309,25 @@ to decide which buffers to ask about, if the PRED argument is nil.
The default value of 'save-some-buffers-default-predicate' is nil,
which means ask about all file-visiting buffers.
---
** string-(to|as|make)-(uni|multi)byte are now declared obsolete.
+++
** New variable 'while-no-input-ignore-events' which allow
setting which special events 'while-no-input' should ignore.
It is a list of symbols.
---
** New function 'undo-amalgamate-change-group' to get rid of
undo-boundaries between two states.
---
** New var 'definition-prefixes' is a hash table mapping prefixes to
the files where corresponding definitions can be found. This can be
used to fetch definitions that are not yet loaded, for example for
'C-h f'.
---
** New var 'syntax-ppss-table' to control the syntax-table used in
'syntax-ppss'.
@ -1331,6 +1337,7 @@ gets evaluated after the new mode's hook has run. This can be used to
incorporate configuration changes made in the mode hook into the
mode's setup.
---
** Autoload files can be generated without timestamps,
by setting 'autoload-timestamps' to nil.
FIXME As an experiment, nil is the current default.
@ -1354,6 +1361,7 @@ 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'.
---
** New function 'region-bounds' can be used in the interactive spec
to provide region boundaries (for rectangular regions more than one)
to an interactively callable function as a single argument instead of
@ -1375,6 +1383,7 @@ 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.
@ -1443,8 +1452,9 @@ ABBR is a time zone abbreviation. The affected functions are
+++
** 'format-time-string' now formats "%q" to the calendar quarter.
** New built-in function 'mapcan' which avoids unnecessary consing (and garbage
collection).
+++
** New built-in function 'mapcan'.
It avoids unnecessary consing (and garbage collection).
+++
** 'car' and 'cdr' compositions 'cXXXr' and 'cXXXXr' are now part of Elisp.
@ -1453,6 +1463,7 @@ collection).
** 'if-let*', 'when-let*', and 'and-let*' are new in subr-x.el.
The incumbent 'if-let' and 'when-let' are now aliases.
---
** Low-level list functions like 'length' and 'member' now do a better
job of signaling list cycles instead of looping indefinitely.
@ -1609,12 +1620,13 @@ internal border.
WINDOW for redisplay.
+++
*** Support for side windows is now official. The display action
function 'display-buffer-in-side-window' will display its buffer in a
side window. Functions for toggling all side windows on a frame,
changing and reversing the layout of side windows and returning the main
(major non-side) window of a frame are provided. For details consult
the section "Side Windows" in the Elisp manual.
*** Support for side windows is now official.
The display action function 'display-buffer-in-side-window' will
display its buffer in a side window. Functions for toggling all side
windows on a frame, changing and reversing the layout of side windows
and returning the main (major non-side) window of a frame are
provided. For details consult the section "Side Windows" in the Elisp
manual.
+++
*** Support for atomic windows - rectangular compositions of windows
@ -1671,12 +1683,13 @@ manual.
** 'tcl-auto-fill-mode' is now declared obsolete. Its functionality
can be replicated simply by setting 'comment-auto-fill-only-comments'.
** New pcase pattern 'rx' to match against a rx-style regular
expression.
** New pcase pattern 'rx' to match against a rx-style regular expression.
For details, see the doc string of 'rx--pcase-macroexpander'.
* Changes in Emacs 26.1 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
@ -1686,6 +1699,7 @@ 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. If your Lisp
@ -1699,7 +1713,8 @@ code. One possible way is this:
(aset file-name (match-beginning 0) ?\\)
(setq start (match-end 0))))
** GUI sessions now treat SIGINT like Posix platforms do.
---
** GUI sessions on MS-Windows now treat SIGINT like Posix platforms do.
The effect of delivering a Ctrl-C (SIGINT) signal to a GUI Emacs on
MS-Windows is now the same as on Posix platforms -- Emacs saves the
session and exits. In particular, this will happen if you start
@ -1716,17 +1731,24 @@ This is in contrast to the default action on POSIX Systems, where it
causes the receiving process to terminate with a core dump if no
debugger has been attached to it.
---
** 'set-mouse-position' and 'set-mouse-absolute-pixel-position' work
on macOS.
---
** Emacs can now be run as a GUI application from the command line on
macOS.
+++
** 'ns-appearance' and 'ns-transparent-titlebar' change the appearance
of frame decorations on macOS 10.9+.
---
** 'ns-use-thin-smoothing' enables thin font smoothing on macOS 10.8+.
---
** 'process-attributes' on Darwin systems now returns more information.
----------------------------------------------------------------------
This file is part of GNU Emacs.