<Swing Dev> RfR JDK-8160893 [macosx] JMenuItems in JPopupMenu are not accessible

[Pete Brunet]

Please review the patch for JDK-8160893.

Bug: https://bugs.openjdk.java.net/browse/JDK-8160893
Patch: http://cr.openjdk.java.net/~ptbrunet/JDK-8160893/webrev.01/

This patch adds support to post menu related events:
kAXMenuOpenedNotification, kAXMenuClosedNotification, and
kAXMenuItemSelectedNotification.  Also note that these changes had
impacts on the current combo box behavior so you'll see combo boxes
filtered out from this fix.  The combo box behavior is currently broken
and will be fixed at a later date but at least for now I didn't want
this patch to change that (broken) behavior.  

TiA,
Pete