window: Queue a frame redraw after tiling

Usually tiling involves a size change and the frame is redrawn
automatically, however this is not the case when switching directly
between left- and right-tiled.
Ensure that a redraw happens in that case as well.

https://bugzilla.gnome.org/show_bug.cgi?id=648700

src/core/window.c

@@ -3581,6 +3581,10 @@ meta_window_tile (MetaWindow *window)
                                        window,
                                        &old_rect,
                                        &new_rect);
+
+      if (window->frame)
+        meta_ui_queue_frame_draw (window->screen->ui,
+                                  window->frame->xwindow);
     }
   else
     {