- On Leopard, even keystroke events generate SystemDefined events, but
- their subtype is 8. */
- if ([event type] != NSSystemDefined || [event subtype] == 8
+ On Leopard, even keystroke events generate SystemDefined event.
+ Third-party applications that enhance mouse / trackpad
+ interaction, or also VNC/Remote Desktop will send events
+ of type AppDefined rather than SysDefined.
+ Menus will fail to show up if they haven't been initialized.
+ AppDefined events may lack timing data.
+
+ Thus, we rely on the didBeginTrackingNotification notification
+ as above to indicate the need for updates.
+ From 10.6 on, we could also use -[NSMenu propertiesToUpdate]: In the
+ key press case, NSMenuPropertyItemImage (e.g.) won't be set.
+ */
+ if (trackingMenu == 0