[8u40] Request for approval 8049418: [macosx] PopupMenuListener.popupMenuWillBecomeVisible is not called for empty combobox on MacOS/aqua look and feel

[Alexander Zvegintsev]

Hello,

This is a request for approval to backport a fix from the jdk9 to the 
jdk8u-dev repository.
The fix applies cleanly to 8u-dev.

The bug: https://bugs.openjdk.java.net/browse/JDK-8049418
The fix: http://hg.openjdk.java.net/jdk9/client/jdk/rev/2afdb5f1ecb2
The review: 
http://mail.openjdk.java.net/pipermail/awt-dev/2014-July/008181.html

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Thanks,
Alexander.