[9] Review Request: 6459798 JDesktopPane, JFileChooser violate encapsulation by returning internal Dimensions

[Sergey Bylokhov]

Hello.
Please review the fix for jdk 9.
Defensive copies were added where necessary.

Bug: https://bugs.openjdk.java.net/browse/JDK-6459798
Webrev can be found at: http://cr.openjdk.java.net/~serb/6459798/webrev.00

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Best regards, Sergey.