[10] Review request for 8178448: MenuBar item handler fired twice

[Alexander Zvegintsev]

Hi all,

please review the fix
http://cr.openjdk.java.net/~azvegint/jdk/10/8178448/00/

for the issue

https://bugs.openjdk.java.net/browse/JDK-8178448

This Mac specific issue happens if setDefaultMenuBar() is called after 
setJMenuBar() with same instance of JMenuBar.

JFrame.setJMenuBar(mb);
Desktop.getDesktop().setDefaultMenuBar(mb);

--
Thanks,
Alexander.