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

[Gregory Heytings]

> > 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

This recipe worked, like mine, differently in Emacs 22-25: foo was 
inserted in the minibuffer.