[pkg-fso-maint] have to switch windows back and forth after firefox, gimp, etc. exit

[jidanni at jidanni.org]

Furthermore, it only affects the keyboard. Working with just the mouse
you would never discover the problem. But once you try to type
something, you realize the window isn't listening yet, and you have to
ALT-TAB away and back to be able to type anything. Quite an
embarrassment here on the mighty Debian system. And now we know that it
is not just specific to one window manager.