bug#42406: Mouse-wheel scrolling can be flickering

[Eli Zaretskii]

> From: martin rudalics <rudalics@gmx.at>
> Date: Tue, 15 Dec 2020 08:58:59 +0100
> Cc: Alan Third <alan@idiocy.org>, 42406@debbugs.gnu.org
> 
>  >> Does the line number displayed in the mode line update correctly when
>  >> you do that and scroll the window?
>  >
>  > Yes, as before. Should there be a problem now?
> 
> Not necessarily.  If you don't see any problems there, the calls in
> window_scroll_pixel_based could be possibly removed since that case
> should be covered elsewhere.

Sorry, no.  We will not remove those calls without a positive evidence
that they are not needed.  It is not enough to say that someone
doesn't see any adverse effects in his/her use patterns and Emacs
customizations.