bug#7464: 24.0.50; mouse highlighting vanishes upon unsplitting window

[Jan Djärv]

30 mar 2012 kl. 10:57 skrev Eli Zaretskii:

>> From: Stephen Berman <stephen.berman@gmx.net>
>> Cc: "Jan D." <jan.h.d@swipnet.se>,  cyd@gnu.org,  7464@debbugs.gnu.org
>> Date: Fri, 30 Mar 2012 10:45:13 +0200
>> 
>> On Fri, 30 Mar 2012 11:00:49 +0300 Eli Zaretskii <eliz@gnu.org> wrote:
>> 
>>>> Date: Fri, 30 Mar 2012 09:43:52 +0200
>>>> From: "Jan D." <jan.h.d@swipnet.se>
>>>> CC: Stephen Berman <stephen.berman@gmx.net>, cyd@gnu.org, 
>>>> 7464@debbugs.gnu.org
>>>> 
>>>> 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.
>>> 
>>> I think your speculation is exactly right.  Perhaps Stephen or someone
>>> else who has access to a GTK build could confirm that an extra
>>> redraw of mouse highlight is triggered at some point in this scenario.
>> 
>> Can you tell me what I have to type in gdb to do this?
> 
> Jan, could you please point out where in the sources we force the
> redraw of the GTK scroll bars?

The one relevant here is probably in gtkutil.c, xg_update_scrollbar_pos at the 
end of the function.
We also do it in xterm.c, x_clear_frame and x_clear_frame_area.

        Jan D.