bug#51210: Customizable other-window-for-scrolling

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: 51210@debbugs.gnu.org
> Date: Thu, 14 Oct 2021 20:58:22 +0300
> 
> >> Often scroll-other-window uses a wrong window for scrolling
> >> when there are more than 2 windows on the frame.
> >
> > Which one is the "right" window?
> 
> The right window would be most-recently-used window like can be
> customized in e.g. compare-windows-get-window-function.

For me, it's always the next-window.  Which explains why you aren't
satisfied: you expect something else.  So why not have a new command,
scroll-mru-window?