bug#44517: 28.0.50; Can't unselect minibuffer window

[martin rudalics]

>> Ok, let's see if can find one.  One more data point: with my setup I can
>> only reproduce when there are at least two visible frames.
>
> That's actually already all you need to reproduce in emacs -Q: open a
> second (window-system) frame.
>
> Then eval something like (read-string "--> ") and hit C-x o.
>
> Sometimes the minibuffer is re-selected right away, sometimes only after
> hitting one more key like C-f.

If yours is an optimized build, try with Alan's fix for Bug#44502.

martin