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

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Gregory Heytings <gregory@heytings.org>,  robert@capuchin.co.uk,
>   47969@debbugs.gnu.org
> Date: Mon, 03 May 2021 11:07:50 +0200
> 
> > FWIW, I think we should instead temporarily disable
> > mouse-autoselect-window when a minibuffer is active.
> 
> I don't think that's what's happening here, exactly.  If you `M-x' then
> moving the mouse to a different window doesn't have any effect that I
> can see.

That's because M-x isn't a prefix key, whereas ESC is.

> It's only in the test case described by Gregory that things go haywire:
> `ESC' + mouse move + `xfoo'.

Here's a demo without ESC:

  M-x set-variable RET mouse-autoselect-window RET t RET
  C-x 2
  C-x ; wait for the "C-x" prompt in the echo area
      ; move mouse to the other window
  b   ; selected-window is not longer the mini-window
  foo ; this gets inserted into some buffer instead of the minibuffer