<Swing Dev> RFR: JDK-8234386: [macos] NPE was thrown at expanding Choice from maximized frame

[Toshio 5 Nakamura]

Hi All,

Could you review the following fix? Also, I'd like to ask a sponsor of this
fix, since I'm not a committer.

Bug: https://bugs.openjdk.java.net/browse/JDK-8234386
Webrev: http://cr.openjdk.java.net/~tnakamura/8234386/webrev.00

Issue:
NullPointerException was thrown when Choice was expanded from maximized
Frame.

Fix:
Simply adding a null check to JPopupMenu. When the frame was maximized and
expanding
Choice component, GraphicsConfiguration parameter can be null. Detailed
description was in JBS.

Thanks,
Toshio Nakamura
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