GNU bug report logs - #42406
Mouse-wheel scrolling can be flickering

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From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: alan <at> idiocy.org, konrad.podczeck <at> univie.ac.at, 42406 <at> debbugs.gnu.org
Subject: bug#42406: Mouse-wheel scrolling can be flickering
Date: Wed, 16 Dec 2020 17:53:37 +0100

>>   > 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?
>>
>> I forgot how Emacs precisely handles that.  Maybe Eli can tell.
>
> See scroll-bar-toolkit-scroll.  Basically, it calls
> scroll-up/scroll-down.

Then something else must come into play here.  I don't see where
'scroll-bar-toolkit-scroll' forces a mode line update.

martin

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