GNU bug report logs - #28652
26.0.60; Display often "flashes" due to double buffering when switching to Emacs frames

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Package: emacs; Reported by: nljlistbox2@HIDDEN (N. Jackson); dated Fri, 29 Sep 2017 18:46:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added indication that bug 28652 blocks24655 Request was from Eli Zaretskii <eliz@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Date: Sun, 01 Oct 2017 10:24:06 +0200
From: martin rudalics <rudalics@HIDDEN>
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To: "N. Jackson" <nljlistbox2@HIDDEN>
Subject: Re: bug#28652: 26.0.60;
 Display often "flashes" due to double buffering
 when switching to Emacs frames
References: <87377573ac.fsf@HIDDEN> <59CF5683.9010807@HIDDEN>
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 Content preview:  > Yes,
 I built from the release branch (emacs-26) on 2017-09-24
 at > commit d93301242f38d3d9aaa55899c07496f0bdecf391. > > The commits you
 mention were made 2017-08-27 and 2017-09-26 > respectively, but neither of
 them seem to be in the emacs-26 > branch. [...] 
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 (rudalics[at]gmx.at)
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 Content preview:  > Yes, I built from the release branch (emacs-26) on 2017-09-24
    at > commit d93301242f38d3d9aaa55899c07496f0bdecf391. > > The commits you
    mention were made 2017-08-27 and 2017-09-26 > respectively, but neither of
    them seem to be in the emacs-26 > branch. [...] 
 
 Content analysis details:   (1.3 points, 10.0 required)
 
  pts rule name              description
 ---- ---------------------- --------------------------------------------------
  1.5 RCVD_IN_SORBS_WEB      RBL: SORBS: sender is an abusable web server
                             [46.125.249.11 listed in dnsbl.sorbs.net]
  0.5 RCVD_IN_SORBS_SPAM     RBL: SORBS: sender is a spam source
                             [212.227.17.22 listed in dnsbl.sorbs.net]
 -0.7 RCVD_IN_DNSWL_LOW      RBL: Sender listed at http://www.dnswl.org/, low
                             trust
                             [212.227.17.22 listed in list.dnswl.org]
 -0.0 SPF_PASS               SPF: sender matches SPF record
  0.0 FREEMAIL_FROM          Sender email is commonly abused enduser mail provider
                             (rudalics[at]gmx.at)

 > Yes, I built from the release branch (emacs-26) on 2017-09-24 at
 > commit d93301242f38d3d9aaa55899c07496f0bdecf391.
 >
 > The commits you mention were made 2017-08-27 and 2017-09-26
 > respectively, but neither of them seem to be in the emacs-26
 > branch.

Then this was pure coincidence and you're facing a more general issue
with double buffering.

martin




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28652; Package emacs. Full text available.

Message received at 28652 <at> debbugs.gnu.org:


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From: nljlistbox2@HIDDEN (N. Jackson)
To: martin rudalics <rudalics@HIDDEN>
Subject: Re: bug#28652: 26.0.60;
 Display often "flashes" due to double buffering when switching to
 Emacs frames
References: <87377573ac.fsf@HIDDEN> <59CF5683.9010807@HIDDEN>
Date: Sat, 30 Sep 2017 15:07:41 -0400
In-Reply-To: <59CF5683.9010807@HIDDEN> (martin rudalics's message of "Sat, 30
 Sep 2017 10:32:03 +0200")
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At 10:32 +0200 on Saturday 2017-09-30, martin rudalics wrote:
>
>> In GNU Emacs 26.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.17)
>>   of 2017-09-24 built on moondust.localdomain
>
> If this happened for a build of master in between commits
>
> c0af83b6ccf2dab9a515dd7f52eb9d4500275ae3
>
> and
>
> 2fa19cc5510cdbf00c54991a9959be984dd99fbe
>
> it would imply that inhibiting double buffering is also needed
> even if it did not cause problems like those from bug#28589. But
> apparently you built from the release branch. So I'm slightly
> confused.
>
> martin

Hi Martin,

Sorry, I don't know if I can help with your confusion.

Yes, I built from the release branch (emacs-26) on 2017-09-24 at
commit d93301242f38d3d9aaa55899c07496f0bdecf391.

The commits you mention were made 2017-08-27 and 2017-09-26
respectively, but neither of them seem to be in the emacs-26
branch.

I am not familiar with bug#28589.

N.





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bug#28652; Package emacs. Full text available.

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To: "N. Jackson" <nljlistbox2@HIDDEN>, 28652 <at> debbugs.gnu.org
Subject: Re: bug#28652: 26.0.60;
 Display often "flashes" due to double buffering
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 > In GNU Emacs 26.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.17)
 >   of 2017-09-24 built on moondust.localdomain

If this happened for a build of master in between commits

c0af83b6ccf2dab9a515dd7f52eb9d4500275ae3

and

2fa19cc5510cdbf00c54991a9959be984dd99fbe

it would imply that inhibiting double buffering is also needed even if
it did not cause problems like those from bug#28589.  But apparently you
built from the release branch.  So I'm slightly confused.

martin




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#28652; Package emacs. Full text available.

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From: nljlistbox2@HIDDEN (N. Jackson)
To: bug-gnu-emacs@HIDDEN
Subject: 26.0.60;
 Display often "flashes" due to double buffering when switching to
 Emacs frames
Date: Fri, 29 Sep 2017 14:44:43 -0400
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When switching between windows in Gnome using Alt-Tab there is
often a bright flash just after switching to an Emacs frame.

It seems as if the Emacs frame is displayed and then a window of
some other application appears for a fraction of a second before
the display settles down to the showing the Emacs frame.

Because the flash is so quick, I Initially thought the Emacs frame
was being displayed in white before being painted to it's correct
display, but this is not the case. By choosing distinctive colours
or distinctive images in my other applications, I can tell that it
is the window of another application that is flashing up.

[This flashing might be particularly noticeable on this system as
I use a dark theme in Emacs (Wheatgrass) and most other
application windows are predominantly white. Also I keep all my
Emacs frames and all my other application windows maximised or
full screen (because I have a small display).]

This flashing does not happen in Emacs 24 or 25. It happens in
Emacs 26 and I think I also saw it when I built master back in
March [1].

However, it does not happen in Emacs 26 if I put

  (add-to-list 'default-frame-alist '(inhibit-double-buffering . t))

in my init file and restart Emacs.

[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25851#170
    

In GNU Emacs 26.0.60 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.17)
 of 2017-09-24 built on moondust.localdomain
Repository revision: d93301242f38d3d9aaa55899c07496f0bdecf391
Windowing system distributor 'Fedora Project', version 11.0.11903000
System Description:	Fedora release 25 (Twenty Five)

Configured using:
 'configure --without-pop 'CFLAGS=-O2 -g3 -gdwarf-4''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL
LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 LCMS2

Important settings:
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  diff-auto-refine-mode: t
  flyspell-mode: t
  pdf-occur-global-minor-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  display-battery-mode: t
  display-time-mode: t
  show-paren-mode: t
  savehist-mode: t
  save-place-mode: t
  electric-pair-mode: t
  desktop-save-mode: t
  delete-selection-mode: t
  cua-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

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/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-pcomplete hides /data/projects/vc/emacs/git/emacs/lisp/org/org-pcomplete
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-datetree hides /data/projects/vc/emacs/git/emacs/lisp/org/org-datetree
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-ledger hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-ledger
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-hledger hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-hledger
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-shen hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-shen
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-entities hides /data/projects/vc/emacs/git/emacs/lisp/org/org-entities
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-macro hides /data/projects/vc/emacs/git/emacs/lisp/org/org-macro
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-forth hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-forth
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-mouse hides /data/projects/vc/emacs/git/emacs/lisp/org/org-mouse
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-sqlite hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-sqlite
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox-org hides /data/projects/vc/emacs/git/emacs/lisp/org/ox-org
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-screen hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-screen
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-asymptote hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-asymptote
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-eval hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-eval
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-archive hides /data/projects/vc/emacs/git/emacs/lisp/org/org-archive
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ox hides /data/projects/vc/emacs/git/emacs/lisp/org/ox
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-org hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-org
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-perl hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-perl
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-faces hides /data/projects/vc/emacs/git/emacs/lisp/org/org-faces
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-bbdb hides /data/projects/vc/emacs/git/emacs/lisp/org/org-bbdb
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-compat hides /data/projects/vc/emacs/git/emacs/lisp/org/org-compat
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-lisp hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-lisp
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-install hides /data/projects/vc/emacs/git/emacs/lisp/org/org-install
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-awk hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-awk
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-calc hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-calc
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-inlinetask hides /data/projects/vc/emacs/git/emacs/lisp/org/org-inlinetask
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-table hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-table
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/ob-fortran hides /data/projects/vc/emacs/git/emacs/lisp/org/ob-fortran
/home/nlj/.emacs.d/elpa/org-plus-contrib-20170917/org-duration hides /data/projects/vc/emacs/git/emacs/lisp/org/org-duration

Features:
(shadow emacsbug misearch multi-isearch mm-archive mailalias smtpmail
gnus-html url-queue help-fns radix-tree browse-url xml url-cache mm-url
url url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util bbdb-message sendmail sort smiley gnus-cite
gnus-async gnus-bcklg nnir qp mail-extr gnus-ml disp-table hl-line
nndraft nnmh utf-7 server pinentry epa-file network-stream nsm starttls
nnfolder bbdb-gnus bbdb-mua nnnil gnus-agent gnus-srvr gnus-score
score-mode nnvirtual gnus-msg nntp gnus-cache cl-extra help-mode vc-git
diff-mode map flyspell ispell pdf-occur ibuf-ext ibuffer
ibuffer-loaddefs tablist tablist-filter semantic/wisent/comp
semantic/wisent semantic/wisent/wisent semantic/util-modes semantic/util
semantic semantic/tag semantic/lex semantic/fw mode-local cedet
pdf-isearch let-alist pdf-misc imenu pdf-tools compile cus-edit pdf-view
bookmark pp pdf-cache pdf-info tq pdf-util org-contacts org-capture
gnus-art mm-uu mml2015 mm-view mml-smime smime dig mailcap gnus-sum
gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source tls
gnutls utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range message
subr-x puny rfc822 mml mml-sec epa derived epg mm-decode mm-bodies
mm-encode mail-parse rfc2231 gmm-utils mailheader gnus-win gnus nnheader
org-duration org-eldoc org-w3m org-rmail org-mhe org-irc org-info
org-habit org-gnus gnus-util rmail rmail-loaddefs rfc2047 rfc2045
ietf-drums mm-util mail-prsvr mail-utils org-docview doc-view jka-compr
image-mode dired-x dired dired-loaddefs org-bibtex bibtex org-bbdb
org-agenda org-element avl-tree generator org advice org-macro
org-footnote org-pcomplete org-list org-faces org-entities noutline
outline easy-mmode org-version ob-shell shell pcomplete ob-R ob-python
ob-plantuml ob-org ob-gnuplot ob-ditaa ob-calc calc-store calc-trail
calc-ext calc calc-loaddefs calc-macs ob-awk ob-dot ob-maxima ob-latex
ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp
ob-comint comint ansi-color ring ob-core ob-eval org-compat org-macs
org-loaddefs format-spec find-func bbdb-anniv diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs bbdb-com crm mailabbrev bbdb bbdb-site
timezone bbdb-loaddefs finder-inf tex-site info package epg-config
url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache url-vars ido seq byte-opt gv bytecomp
byte-compile cconv edmacro kmacro recentf tree-widget wid-edit easymenu
battery time wheatgrass-theme paren savehist saveplace elec-pair desktop
frameset cl-loaddefs cl-lib delsel cua-base cus-start cus-load time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 546388 179405)
 (symbols 48 103149 168)
 (miscs 40 14262 10745)
 (strings 32 162301 27047)
 (string-bytes 1 5309059)
 (vectors 16 58177)
 (vector-slots 8 1837024 256975)
 (floats 8 410 957)
 (intervals 56 5710 116)
 (buffers 992 70))




Acknowledgement sent to nljlistbox2@HIDDEN (N. Jackson):
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#28652; Package emacs. Full text available.
Please note: This is a static page, with minimal formatting, updated once a day.
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Last modified: Wed, 4 Oct 2017 09:45:01 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.