[9] Review request for 8153512: Taskbar support reported for Xfce4.

[Alexander Zvegintsev]

Hello,
please review the fix
http://cr.openjdk.java.net/~azvegint/jdk/9/8153512/00/
for the issue
https://bugs.openjdk.java.net/browse/JDK-8153512

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Thanks,

Alexander.