Changes

Planner: Fix nullPointer when layouting hierarchical menus

When the menu property is updated with the same value after the
initialization, a null pointer exception occurs when layouting
hierarchical menus. This is because the menu gets removed, but not
rendered again. The equals check in Widget#setPropertyInternal and
MenuBar#setMenuItems are not the same. This change prevents the removal
of the menus.

384547
 (commit: 1e81c7e)