GNU bug report logs - #18912
24.4; mode-line corruption on graphical frames in dual-headed display

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From: Andreas Schwab <schwab <at> suse.de>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Eli Zaretskii <eliz <at> gnu.org>, Bruno Félix Rezende Ribeiro <oitofelix <at> gnu.org>, 18912 <at> debbugs.gnu.org
Subject: bug#18912: 24.4; mode-line corruption on graphical frames in dual-headed display
Date: Wed, 05 Nov 2014 10:17:18 +0100

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> Moreover, the fact that running xrefresh, which is not an Emacs
>> command, fixes the display is yet another argument against this
>> hypothesis.  xrefresh doesn't communicate with Emacs, so the only way
>> it could fix the display is if the data supplied by Emacs was correct.
>
> Actually xrefresh does (indirectly) communicate with Emacs, IIRC, since
> it causes the X server to generate "expose" events to redraw everything.

That doesn't mean that the X server (or the compositor) has to ask the
application to redraw the window contents, it may be reusing an
off-screen copy of it.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab <at> suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
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