<AWT Dev> [9] Review request for 8159460: On Ubuntu Unity, problem with java/awt/Window/FindOwner/FindOwnerTest

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:

bug: https://bugs.openjdk.java.net/browse/JDK-8159460

webrev: http://cr.openjdk.java.net/~ssadetsky/8159460/webrev.00/

On Unity WM_TAKE_FOCUS notification is sent to the decorated parent 
window if its undecorated child window is clicked by mouse, after that 
ButtonPress notification is sent. Those notifications causes two 
parallel sequences of AWT events to gain focus to different windows. 
Since focus requests are asynchronous the resulting focus may by 
obtained randomly by the clicked child window or by its owner.

The fix solution is : in case of Unity WM, do not change the current 
focused window if the incoming WM_TAKE_FOCUS is addressed the current 
active window and the current focused window owned by the active 
window.  This solution should prevent racing focus requests on Unity.

--Semyon