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 to add it to 'exit-minibuffer', and it seems working fine
> with non-nil read-from-minibuffer-restore-windows, and I know no other
> place that could call minibuffer-hide-completions:

But 'minibuffer-hide-completions' uses 'bury-buffer' which would delete
the completions window unconditionally even when it was only reused for
showing completions.  IMO 'bury-buffer' is practically always the wrong
choice for Lisp functions to call.

martin