bug#45581: 28.0.50; C-M-v in xref buffers shows a different buffer when scrolling

[martin rudalics]

> Xref buffers have been doing this since bug#19466, as requested by
> Martin (see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=19466#56).
>
> Perhaps Martin or others will chime in, but otherwise you seem to be
> making a good case for not doing this anymore.

Probably.  'cvs-temp-buffer' has a similar note:

      ;; FIXME: this doesn't do the right thing if the user later on
      ;; does a `find-file-other-window' and `scroll-other-window'
      (setq-local other-window-scroll-buffer buf))

I don't use C-M-v so I can't tell whether 'other-window-scroll-buffer'
was ever useful in the first place for *xref*.

martin