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

[Juri Linkov]

>> >> 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.
>> 
>> You can't start typing because it's in another window.
>
> Fortunately, Emacs has this "C-x o" command that fixes that small
> problem.

But "C-x o C-<end>" doesn't recenter after moving to the end of the buffer.

>> >> 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.
>> 
>> So everyone who wants to recenter, can type: 'M-<end> M-C-S-l'.
>
> I object to changing this behavior by default.

Then how this problem can be fixed?