[9] Review request for 8178996 [macos] JComboBox doesn't display popup in mixed JavaFX Swing Application on 8u131 and Mac OS 10.12

[Alexander Zvegintsev]

Hi all,

please review the fix
http://cr.openjdk.java.net/~azvegint/jdk/9/8178996/00/

for the issue

https://bugs.openjdk.java.net/browse/JDK-8178996


Popup doesn't show up due to owner is lightweight frame and doesn't have 
a native pointer,

thus we do not invoke owner.execute() code block, while 
nativeCreateNSWindow should be called with null ownerPtr.


--
Thanks,
Alexander.