<Swing Dev> [9] Review Request for 8129940: JRadioButton does not honor non-standard FocusTraversalKeys

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:

bug: https://bugs.openjdk.java.net/browse/JDK-8129940
webrev: http://cr.openjdk.java.net/~ssadetsky/8129940/webrev.00/

It is a regression from 8033699. In this fix focus traversal keys were 
hard-coded in JRadioButton to be TAB and SHIFT+TAB only. But those keys 
can be amended by user as well. Solution : use the generic logic to 
identify focus traversal keys.

--Semyon