GNU bug report logs - #35246
26.2; Mouse wheel scrolling in GTK build sometimes scrolls the entire buffer

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From: Stefan Kangas <stefan <at> marxist.se>
To: Alex Gramiak <agrambot <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 35246 <at> debbugs.gnu.org
Subject: bug#35246: 26.2; Mouse wheel scrolling in GTK build sometimes scrolls the entire buffer
Date: Wed, 2 Sep 2020 17:32:24 -0400

Alex Gramiak <agrambot <at> gmail.com> writes:

> I just got another issue, and this time:
>
> 1) Busy cursor briefly appeared after several seconds of a
> non-responsive Emacs.
>
> 2) Scrolling occurred right after with a seemingly normal scrolling
> distance.

Here's an idea:

Do you see this only if you scroll while Emacs is busy?  Or do you see
this even without that precondition?

FWIW, I can reproduce the jumping action here with the following steps:

1. <go to the beginning some long buffer>
2. M-! sleep 2 RET
3. <scroll on the mouse wheel a lot>

Also, do you have `pixel-scroll-mode' enabled?

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