[9] Review Request: 8041734 JFrame in full screen mode leaves empty workspace after close

[Sergey Bylokhov]

Hello.
Please review the fix for jdk 9, which adds additional call to 
nswindow.close() when we hide/dispose our peer.

Bug: https://bugs.openjdk.java.net/browse/JDK-8041734
Webrev can be found at: http://cr.openjdk.java.net/~serb/8041734/webrev.00

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Best regards, Sergey.