bug#61307: 30.0.50; pixel-scroll-precision-mode: window-scroll-functions?

[Eli Zaretskii]

> Cc: 61307@debbugs.gnu.org
> Date: Mon, 06 Feb 2023 22:07:55 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Michael Heerdegen <michael_heerdegen@web.de> writes:
> 
> > Hello,
> >
> > I discovered that when scrolling with the mouse wheel while
> > `pixel-scroll-precision-mode' is enabled `window-scroll-functions' are
> > not run.  Should they be?
> >
> >
> > TIA,
> >
> > Michael.
> 
> IIRC this is due to how pixel-scroll-precision-mode calls
> set-window-start with NOFORCE set to t.
> 
> Patches welcome, but please make sure they do not slow precision
> scrolling down.

We should probably call window-scroll-functions once in several
scrolls, approximately, once every text line worth of scrolling or
something.