Force a redraw if the window focus changes.

Otherwise if all of the windows in the new situation never redraw
we never update to show the new focus configuration.

This change avoids things like stuck overlays and notification
windows if the underlying game is stuck.

Author: BNieuwenhuizen

src/steamcompmgr.cpp

@@ -1597,6 +1597,8 @@ determine_and_apply_focus(Display *dpy, MouseCursor *cursor)
 	gameFocused = false;
 
 	Window prevFocusWindow = currentFocusWindow;
+	Window prevOverlayWindow = currentOverlayWindow;
+	Window prevNotificationWindow = currentNotificationWindow;
 	currentFocusWindow = None;
 	currentFocusWin = nullptr;
 	currentOverlayWindow = None;
@@ -1637,6 +1639,12 @@ determine_and_apply_focus(Display *dpy, MouseCursor *cursor)
 		}
 	}
 
+	if ( prevOverlayWindow != currentOverlayWindow ||
+	     prevNotificationWindow != currentNotificationWindow )
+	{
+		hasRepaint = true;
+	}
+
 	std::vector< unsigned long > focusable_appids;
 	std::vector< unsigned long > focusable_windows;
 
@@ -1781,6 +1789,8 @@ determine_and_apply_focus(Display *dpy, MouseCursor *cursor)
 					PropModeReplace, (unsigned char *)wmState,
 					sizeof(wmState) / sizeof(wmState[0]));
 
+		hasRepaint = true;
+
 		gpuvis_trace_printf( "determine_and_apply_focus focus %lu", focus->id );
 
 		if ( debugFocus == true )