bug#51886: 29.0.50; pixel-scroll-mode garbage collects like crazy

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: Po Lu <luangruo@yahoo.com>,  51886@debbugs.gnu.org
> Date: Tue, 16 Nov 2021 14:28:23 +0100
> 
> I suspect itʼs the bit that counts from k to n by generating a list of
> the integers from k to n and then running dolist over that.

Maybe, but I think we want a more direct evidence.

> As an aside, that code also does a lot of (sit-for 0), which I seem to
> remember can trigger redisplay? Perhaps it should only do that when it
> really wants to pause.

It doesn't want to pause, it wants to trigger redisplay.  Without that
the stuff will not work.