[9] Review request for 8172096: SwingNode, Linux: certain mnemonics don't work on Unity

[Semyon Sadetsky]

Hello Kevin & David,

Please review the fix for jfx9:

bug: https://bugs.openjdk.java.net/browse/JDK-8172096

webrev: http://cr.openjdk.java.net/~ssadetsky/8172096/webrev.00/

The details are in the bug.

--Semyon