bug#18722: Correction

[martin rudalics]

> Actions that trigger the bug:
>
> 1. Start emacs -Q.
> 2. Unfocus the application window, e.g., by clicking on another
> application.
> 3. Re-focus Emacs.
> 4. Write something.
>
> Result: The typed text does not appear.  When I click on a menu-item,
> the typed text appears and the UI is responsive again.

> The problem seems to appear when I iconify and reopen the Emacs
> window.  Unfocusing the Emacs window alone is not enough to trigger the
> bug.  Also it seems that Emacs is responding to my input.  It just
> doesn't render changes in the windows and the minibuffer.

I see something similar when I minimize the maximized window of another
application and (presumably, implicitly) re-focus the Emacs window.  But
I have no good recipe to trigger it reliably.  It would help so much if
you were able to bisect this ...

martin