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

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Tue, 04 Jan 2022 10:38:41 +0200
> Cc: 51210@debbugs.gnu.org
> 
> I agree it would be nice to move scrolling commands to Lisp.

How do you envision being able to do that?  The implementation makes
screen layout decisions by simulating redisplay, and that is not
possible in Lisp, at least not without exposing new primitives (which
I personally would object to, for more than one reason).