bug#42406: Mouse-wheel scrolling can be flickering

[Konrad Podczeck]

Just using the mouse, moving the vertical scroll-bars up and down. As with 
mouse-wheel scrolling, performance decreases with the number of open frames, in 
the sense that scrolling becomes more and more sticky.



> Am 15.12.2020 um 20:45 schrieb Eli Zaretskii <eliz@gnu.org>:
> 
>> From: Konrad Podczeck <konrad.podczeck@univie.ac.at>
>> Date: Tue, 15 Dec 2020 20:31:19 +0100
>> Cc: Alan Third <alan@idiocy.org>, 42406@debbugs.gnu.org
>> 
>> Performance does not degrade when only the two calls of 
>> wset_update_mode_line you mentioned are commented out. However, with just 
>> commenting out these two instances, I still have a scroll performance 
>> problem when scrolling by using the scroll-bars. Could you also identify the 
>> instance concerning this?
> 
> Please be more specific: how do you scroll with the scroll bars, and
> what kind of performance problem you experience as result of that?