window-props.c: React to changes to _GTK_FRAME_EXTENTS

When _GTK_FRAME_EXTENTS changes, we need to redo constraints on
the window - this matters in particular if the toolkit removes
invisible borders when a window is maximized, since otherwise
the maximized window will be positioned as if it still has
invisible borders.

https://bugzilla.gnome.org/show_bug.cgi?id=714707

src/core/window-props.c

@@ -316,6 +316,9 @@ reload_gtk_frame_extents (MetaWindow    *window,
     {
       window->has_custom_frame_extents = FALSE;
     }
+
+  if (!initial)
+    meta_window_queue(window, META_QUEUE_MOVE_RESIZE);
 }
 
 static void