bug#45688: 28.0.50; New action for display-buffer?

[Juri Linkov]

> Reading this:
>
> https://www.jwz.org/blog/2021/01/very-much-do-not-have-my-emacs-setup-just-how-i-like-it/
>
> I was curious how XEmacs did this command, so I installed XEmacs.  If
> there's two (or one) window, the command works the same in Emacs and
> XEmacs, but it's interesting what XEmacs does when there's more than two
> windows: It cycles the windows.

This is how Emacs already works - exactly as XEmacs
it uses get-lru-window that caused a lot of sadness
for many years.  Many times I asked to fix this to
use get-mru-window instead.  Maybe now is a good moment to
finally change this to work differently from XEmacs.