<AWT Dev> [9] Review request for 8072069: Toolkit.getScreenInsets() doesn't update if insets change

[Anton Nashatyrev]

Hello,

     could you please review the following fix:

fix: http://cr.openjdk.java.net/~anashaty/8072069/9/webrev.00/ 
<http://cr.openjdk.java.net/%7Eanashaty/8072069/9/webrev.00/>
bug: https://bugs.openjdk.java.net/browse/JDK-8072069

     Problem: Toolkit.getScreenInsets() returns old value after Dock 
moved/resized on Mac

     Fix: remove the value caching and always ask native for insets.
This shouldn't cause any performance drawbacks since the 
getScreenInsets() is rarely called (mostly on window init and on popup 
positioning).

Thanks!
Anton.