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 am trying to see relevance here, maybe I miss something. The
> built-in completion does not replace the window which I am looking it.
> It may make its visible part somewhat smaller, but not replace it.
>
> Then I change buffers in those windows. Apart from being made somewhat
> narrower, windows are not replaced by completion.
>
> And I did not even use completion. I was entering information on minibuffer.
>
>> One thing that has to be considered too is user interaction during
>> completion: Suppose I have one window, the completion mechanism pops up
>> a new one and I delete the old one
>
> I have not ever see that in built-in Emacs completion. But maybe it exists.
>
> I have seen completion poping up new window, but not replacing or
> deleting other window.

All these scenarios are with customizations.  I'm not experienced enough
to tell whether they (can) happen in practice.

martin