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GNU Emacs NEWS -- history of user-visible changes.

Copyright (C) 2017 Free Software Foundation, Inc.
See the end of the file for license conditions.

Please send Emacs bug reports to bug-gnu-emacs@gnu.org.
If possible, use M-x report-emacs-bug.

This file is about changes in Emacs version 27.

See file HISTORY for a list of GNU Emacs versions and release dates.
See files NEWS.26, NEWS.25, NEWS.24, NEWS.23, NEWS.22, NEWS.21,
NEWS.20, NEWS.19, NEWS.18, and NEWS.1-17 for changes in older Emacs
versions.

You can narrow news to a specific version by calling 'view-emacs-news'
with a prefix argument or by typing C-u C-h C-n.

Temporary note:
+++ indicates that all necessary documentation updates are complete.
    (This means all relevant manuals in doc/ AND lisp doc-strings.)
--- means no change in the manuals is needed.
When you add a new item, use the appropriate mark if you are sure it applies,

\f
* Installation Changes in Emacs 27.1

\f
* Startup Changes in Emacs 27.1

\f
* Changes in Emacs 27.1

---
** The new option 'tooltip-resize-echo-area' avoids truncating tooltip text
on GUI frames when tooltips are displayed in the echo area.  Instead,
it resizes the echo area as needed to accommodate the full tool-tip
text.

+++
** New function 'logcount' calculates an integer's Hamming weight.

\f
* Editing Changes in Emacs 27.1

---
** New variable 'x-wait-for-event-timeout'.
This controls how long Emacs will wait for updates to the graphical
state to take effect (making a frame visible, for example).

+++
** The new user option 'electric-quote-replace-double' controls
whether '"' is also replaced in 'electric-quote-mode'.  If non-nil,
'"' is replaced by a double typographic quote.

\f
* Changes in Specialized Modes and Packages in Emacs 27.1

** Dired

+++
*** The new user option 'dired-create-destination-dirs' controls whether
'dired-do-copy' and 'dired-rename-file' should create non-existent
directories in the destination.

** Edebug

+++
*** The runtime behavior of Edebug's instrumentation can be changed
using the new variable 'edebug-behavior-alist' and the new abnormal
hooks 'edebug-after-instrumentation-functions' and
'edebug-new-definition-functions'. Edebug's behavior can be changed
globally or for individual definitions.

** Enhanced xterm support

*** New variable 'xterm-set-window-title' controls whether Emacs sets
the XTerm window title.  This feature is experimental and is disabled
by default.

\f
* New Modes and Packages in Emacs 27.1

\f
* Incompatible Lisp Changes in Emacs 27.1

** The FILENAME argument to 'file-name-base' is now mandatory and no
longer defaults to 'buffer-file-name'.

---
** The function 'eldoc-message' now accepts a single argument.
Programs that called it with multiple arguments before should pass
them through 'format' first.  Even that is discouraged: for ElDoc
support, you should set 'eldoc-documentation-function' instead of
calling 'eldoc-message' directly.

\f
* Lisp Changes in Emacs 27.1

---
** The 'file-system-info' function is now available on all platforms.
instead of just Microsoft platforms.  This fixes a 'get-free-disk-space'
bug on OS X 10.8 and later (Bug#28639).

---
** The function 'get-free-disk-space' returns now a non-nil value for
remote systems, which support this check.

\f
* Changes in Emacs 27.1 on Non-Free Operating Systems

\f
----------------------------------------------------------------------
This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

\f
Local variables:
coding: utf-8
mode: outline
paragraph-separate: "[ 	\f]*$"
end:

debug log:

solving acfc52ab52 ...
found acfc52ab52 in https://yhetil.org/emacs-bugs/87376i2xb5.fsf@gmail.com/
found 716b0309a5 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 716b0309a5aff3318c8cbd67961ed56505349482	etc/NEWS

applying [1/1] https://yhetil.org/emacs-bugs/87376i2xb5.fsf@gmail.com/
diff --git a/etc/NEWS b/etc/NEWS
index 716b0309a5..acfc52ab52 100644

Checking patch etc/NEWS...
Applied patch etc/NEWS cleanly.

index at:
100644 acfc52ab5255bdf949a51e67467b041ad63b97b9	etc/NEWS

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