[9] Review Request: JDK-8032872: [macosx] Cannot select from JComboBox in a JWindow

[dmitry markov]

Hello,

Could you review the fix for jdk9, please?
bug: https://bugs.openjdk.java.net/browse/JDK-8032872
webrev: http://cr.openjdk.java.net/~dmarkov/8032872/jdk9/webrev.00/

Problem description: It is impossible to make a selection in JComboBox 
added to JWindow via the mouse. The problem is caused by incorrect mouse 
events handling in LWWindowPeer class. When LWWindowPeer receives a 
mouse event intended for a popup window, it checks whether the current 
grabbingWindow is owner of the popup using getOwnerFrameDialog() method. 
This approach always fails for the JComboBox added to JWindow. As a 
result an UngrabEvent is send to the popup window.

Fix: Introduce new private method 
LWWindowPeer.isOneOfOwnersOf(LWWindowPeer peer). The method will be 
invoked on grabbingWindow object to test whether it is owner of current 
mouse event target or not. The usage of getOwnerFrameDialog() should be 
replaced by isOneOfOwnersOf() in LWWindowPeer.notifyMouseEvent() and 
LWWindowPeer.NotifyNCMouseDown().

Thanks,
Dmitry