bug#47969: 28.0.50; Losing minibuffer focus in trying M-x command

[Eli Zaretskii <eliz@gnu.org>]

> From: martin rudalics <rudalics@gmx.at>
> Date: Mon, 3 May 2021 14:02:13 +0200
> Cc: Robert Marshall <robert@capuchin.co.uk>, 47969@debbugs.gnu.org
> 
>  > Okay, I bisected this, and the culprit is commit 3fdd3bb56c. Interestingly, that commit removed the following from handle-select-window:
>  >
>  > ;; Don't switch if we're currently in the minibuffer.
>  > ;; This tries to work around problems where the
>  > ;; minibuffer gets unselected unexpectedly, and where
>  > ;; you then have to move your mouse all the way down to
>  > ;; the minibuffer to select it.
>  > (window-minibuffer-p)
>  >
>  > which happens to be what my patch adds again.
> 
> I can't give a reasonable explanation why I removed that back then, so
> please re-add it as soon as your paperwork is done.

I'd actually trust your-then judgment, and instead explore the
possibility of solving this as I proposed up-thread.  Undoing past
fixes when we don't understand the effects is bad mantra, it runs the
risk of fixing one problem by reintroducing another.

> And many thanks for the bisection, great work as usual.

Seconded.