Please review the following:

Bug: https://bugs.openjdk.java.net/browse/JDK-8161483
Patch: http://cr.openjdk.java.net/~ptbrunet/JDK-8161483/webrev.00/

This is a followon to the patch for
JDK-8145207 [macosx] JList, VO can't access non-visible list items

In order to fixJDK-8145207the AccessibleAction interface was needed for
JList.AccessibleJList.AccessibleJListChild but a backport of this fix
has been requested and the released public API can not be changed in 8u
or earlier.  The workaround for JDK-8145207 is to create and use a
private subclass of JList.AccessibleJList.AccessibleJListChild,
JList.AccessibleJList.ActionableAccessibleJListChild.  The downside of
this fix is that it returns a subclass of the
JList.AccessibleJList.AccessibleJListChild.  If a user overrides the
class and returns from its code it will not inherit the AccessibleAction
behavior.  For JDK 9 the ActionableAccessibleJListChild subclass should
be removed and the AccessibleAction implementation moved to
JList.AccessibleJList.AccessibleJListChild.

TiA,
Pete

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