[8] Review request for 7158311 GraphicsDevice.setDisplayMode(...) leads to hang when DISPLAY variable points to Oracle Linux

[Alexander Zvegintsev]

Hello,

Could you please review a fix for following issues:
https://bugs.openjdk.java.net/browse/JDK-7158311
https://bugs.openjdk.java.net/browse/JDK-8001463
webrev:
http://cr.openjdk.java.net/~serb/alexz/7158311/webrev.00/

All X11 implementations of DisplayChangedListener does not call any X11 
routines, hence
SunGraphicsEnvironment.displayChanged() callback does not require an 
AWTLock and we
can temporarily release it to avoid deadlock.

--
Thanks,

Alexander.