<Swing Dev> [9] Review request for 8154043: Fields not reachable anymore by tab-key, because of new tabbing behaviour of radio button groups.

[Semyon Sadetsky]

Hello,

Please review fix for JDK9:

bug: https://bugs.openjdk.java.net/browse/JDK-8154043

webrev: http://cr.openjdk.java.net/~ssadetsky/8154043/webrev/

The new RadioButton group focus traversal algorithm introduced by 
JDK-8033699 doesn't take into account that group of radio buttons can be 
lay-outed in several lines in container. In this case the 
LayoutFocusTraversalPolicy may mix radio buttons of the same group with 
other components in its focus traversal order and break the assumption 
used in BasicRadioButtonUI#getFocusTransferBaseComponent() that radio 
buttons are sequenced in the focus policy order.

The fix propose to treat a group of toggle buttons as a single focus 
cycle entry in the LayoutFocusTraversalPolicy which order is determined 
by the first toggle button in the group.

--Semyon