When removing xrandr regions, ensure clients are within the bounds of

the screen; adapted from an ancient diff from Sviatoslav Chagaev. Things
in this area will likely change, but put this in so it works now and
serves as a reminder.

xevents.c

@@ -386,6 +386,7 @@ xev_handle_randr(XEvent *ee)
 		if (sc->which == i) {
 			XRRUpdateConfiguration(ee);
 			screen_update_geometry(sc);
+			screen_assert_clients_within(sc);
 		}
 	}
 }