Merge from origin/emacs-26

1e5949642a ; * src/gtkutil.c (xg_create_frame_widgets): Add FIXME re....
e7c8da4d05 bug#28609: simple.el
827db6b559 Use a separate syntax-ppss cache for narrowed buffers
a2244f417a Improve python3-compatibility of fallback completion (Bug#...
79162cb0db Fix subr-x-tests when running from elc
66d35ae49d * lisp/eshell/esh-util.el (eshell-condition-case): Add deb...
f5e72b04d9 Make sh-indentation into an alias for sh-basic-offset (Bug...
a58d0c590a Fix loading of smie-config rules (Bug#24848)
3a68dec327 ; Update NEWS for the change in eldoc-message
5a41dd0a1f Reset default-directory inside *xref-grep* buffer
49cd561dc6 * test/lisp/tramp-tests.el (tramp-test21-file-links): Spec...
b719f6b20b Loosen strict parsing requirement for desktop files
c7a0c13777 * lisp/xdg.el (xdg-thumb-uri): Fix doc string.
dc6b3560e5 Fix documentation of `make-frame' and related variables an...
3d3778d82a Accept new `always' value for option `buffer-offer-save'
638f64c40a Improve new NS scrolling variable names
d93301242f Document 'replace-buffer-contents' in the manual.
00e4e3e9d2 Fix undecorated frame resizing issues on NS (bug#28512)
820739bbb5 ; * doc/emacs/display.texi (Display Custom): Fix wording.
f2b2201594 ; Spelling and URL fixes
0e143b1fc5 Documentation improvements for 'display-line-numbers'
f656ccdb43 ; Fix typo
d64da52d57 Fix last change in bat-mode.el
908af46abd Fix restoring in GUI sessions desktop saved in TTY sessions
51cbd85454 Improve syntax highlighting in bat-mode
0273916618 Document the 'list-FOO' convention
d24ec58540 Expose viewing conditions in CAM02-UCS metric
a81d5a3d3f Revert "Set frame size to actual requested size (bug#18215)"
0bf066d4b2 Add tests for Edebug
68baca3ee1 Catch more messages in ert-with-message-capture
28e0c410c9 ; * lisp/mouse.el (secondary-selection-exist-p): Doc fix.
31e1d9ef2f Support setting region from secondary selection and vice v...
047f02f00f Fix new copy-directory bug with empty dirs
fbd15836af * doc/lispref/strings.texi (Formatting Strings): Improve i...
f16a8d5dbd Fix 2 testsuite tests for MS-Windows
965cffd89c Rename timer-list to list-timers
a5fec62b51 Provide native touchpad scrolling on macOS
7b3d1c6beb Fix MinGW64 build broken by recent MinGW64 import libraries
c83d0c5fdf Fix crashes in 'move-point-visually' in minibuffer windows
7f3d5f929d * src/emacs.c (usage_message): Don't mention 'find-file'.
6845282200 Fix a minor inaccuracy in the Emacs manual
74d7bb9498 Fix errors in flyspell-post-command-hook
40fdbb01d0 Work on Tramp's file-truename
1a01423b3c Fix bug with make-directory on MS-Windows root
066efb8666 Fix log-view-diff-common when point is after last entry
3f006b56cd Adapt fileio-tests--symlink-failure to Cygwin
ee512e9a82 Ignore buffers whose name begins with a space in save-some...
9e1b5bd92c Improve tramp-interrupt-process robustness
8d4223e61b Minor Tramp doc update
331d0e520f Fix gensym
466df76f7d Cleanup in files-tests.el
6359fe630a Remove old cl-assert calls in 'newline'
059184e645 Avoid crash with C-g C-g in GC
541006c536 Fix format-time-string %Z bug with negative tz
679e05eeb9 message-citation-line-format %Z is now tz name
4e8888d438 Use doc-view or pdf-tools on any window-system
5f28f0db73 Fix bug with min and max and NaNs
37b5e661d2 Fix recently-introduced copy-directory bug
6bbbc38b34 Merge from Gnulib
57249fb297 Fix compatibility problem in Tramp
411bec82c4 Avoid GCC 7 compilation warning in eval.c
34a6774daa ; Partially revert c3445aed5194
3003ac0469 Adapt Tramp version.  Do not merge
48d39c39e8 Search for Syntax section when viewing MDN
9d101376b4 Allow smerge-keep-current to work for empty hunks
13aba24add Call vc-setup-buffer in vc-git-log-{in,out}going
1d599df5e0 Fix last change to textmodes/page-ext.el
a726e09a9a * test/src/lcms-tests.el (lcms-cri-cam02-ucs): Skip if lcm...
546413e1ac * test/src/lcms-tests.el (lcms-whitepoint): Skip if lcms2 ...
96aaeaaffa ; * src/lcms.c: Minor stylistic changes in comments.
c3df816585 Fix compilation warning in etags.c

1 files changed, 4 insertions, 1 deletions

diff --git a/src/gtkutil.c b/src/gtkutil.c
index f3e89c82c66..46d3d1d93d2 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -1224,7 +1224,10 @@ xg_create_frame_widgets (struct frame *f)
      with regular X drawing primitives, so from a GTK/GDK point of
      view, the widget is totally blank.  When an expose comes, this
      will make the widget blank, and then Emacs redraws it.  This flickers
-     a lot, so we turn off double buffering.  */
+     a lot, so we turn off double buffering.
+     FIXME: gtk_widget_set_double_buffered is deprecated and might stop
+     working in the future.  We need to migrate away from combining
+     X and GTK+ drawing to a pure GTK+ build.  */
   gtk_widget_set_double_buffered (wfixed, FALSE);
 
 #if ! GTK_CHECK_VERSION (3, 22, 0)