GNU bug report logs - #7464
24.0.50; mouse highlighting vanishes upon unsplitting window

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From: "Jan D." <jan.h.d <at> swipnet.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Stephen Berman <stephen.berman <at> gmx.net>, 7464 <at> debbugs.gnu.org, cyd <at> gnu.org
Subject: bug#7464: 24.0.50; mouse highlighting vanishes upon unsplitting window
Date: Fri, 30 Mar 2012 09:43:52 +0200

Hello.

Eli Zaretskii skrev 2012-03-29 20:47:
>> From: Stephen Berman<stephen.berman <at> gmx.net>
>> Cc: cyd <at> gnu.org,  7464 <at> debbugs.gnu.org
>> Date: Thu, 29 Mar 2012 09:57:53 +0200
>>
>> openSUSE's 23.3 has GTK scroll bars, while I built 23.4 like I build 24,
>> i.e., without toolkit scroll bars.  So I rebuilt 23.4 with GTK scroll
>> bars, did the bug recipe and sure enough, now the mouse highlighting
>> remained, i.e., no bug.  Then I disabled the scroll bars in that build,
>> tested again, and got the bug again.  Then I rebuilt Emacs 24 with GTK
>> scroll bars, and now did not see the bug with them enabled but did see
>> it with them disabled.  So the answers to my questions above appear to
>> involve the presence vs. absence of GTK scroll bars.  (I guess Chong
>> Yidong also builds Emacs 24 with GTK scroll bars and tested the recipe
>> with them enabled, so that's why he did not observe the bug.)
>
> Unfortunately, I know almost nothing about how GTK in general and GTK
> scroll bars in particular are integrated into Emacs, and what, if
> anything, they change in how the Emacs display engine works.
>

It probably has something to do with the fact that Gtk+ scrollbars 
aren't handeled by the display engine and we therefore have to force a 
redraw of the scroll bars at certain points so the scrollbars look ok. 
Presumably one of these redraws does something that triggers a redraw of 
mouse highlight?  It might be that a redraw of the scroll bar generates 
some X expose/configuration event that in turn invokes the display 
engine.  I'm just speculating.


	Jan D.

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