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

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: rudalics@gmx.at,  51210@debbugs.gnu.org
> Date: Wed, 12 Jan 2022 20:04:32 +0200
> 
> >> There are also nice commands: M-<home> (beginning-of-buffer-other-window)
> >> and M-<end> (end-of-buffer-other-window), but for no reason they recenter
> >> the other window after moving to the beginning/end.
> >> 
> >> It would be better to remove this disservice:
> >
> > This is age-old behavior.  Why change it because you happen to dislike
> > it?
> 
> The problem is that with its current implementation, it's unusable:
> when the window height is 75 lines, then typing M-<end> leaves
> half-screen empty.

If you start typing at the end of the buffer, the half-empty window
will immediately make sense.

Are you using scroll-conservatively, perhaps?  If so, I can understand
why you don't like this behavior.  But that's your subjective opinion,
and I see no reason to change this by default.

> But fortunately this can be fixed since Emacs 28 introduced a new key
> C-M-S-l to recenter the other window, so it's now easy to type it
> when the user needs to recenter the other window.

Great.