bug#45072: 28.0.50; Emacs switches other buffer back uncontrollably, if other window's buffer is changed by user during minibuffer editing

[martin rudalics]

> I tried your previous patch and it has strange effect:
>
> C-x 2 C-x o - so the bottom window is selected.
>
> C-h f C-g - after canceling the minibuffer, the top window is selected,
> not the bottom window as before activating the minibuffer.

Should be part of the recent "Stop frames stealing each others'
minibuffers!" rampage.  We can look into it when the dust settles -
there are still bugs to fix and riddles to solve in that area.  Till
then it would be good to try the patch on Emacs 27 to catch any
anomalies ...

martin