<AWT Dev> <Awt Dev> [9] Review Request for 8145784: https://bugs.openjdk.java.net/browse/JDK-8145784

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:
bug: https://bugs.openjdk.java.net/browse/JDK-8145784
webrev: http://cr.openjdk.java.net/~ssadetsky/8145784/webrev.00/

Robot used wrong root window for the mouse move because when the 
Xinerama is on JDK treats multiple screens as a single joint root 
window, and screen number obtained from the graphics config is always 0. 
So mouse could not leave the main screen using AWT robot.
Solution: take the correct screen number from the device object.

--Semyon