ARIA CR Test case 848

Hi Alex,

Is there a reason Firefox is generating an EVEN_OBJECT_SELECTION instead of
an EVEN_OBJECT_SELECTIONADD for option 3?

This is a multiselectable listbox
https://dvcs.w3.org/hg/pfwg/raw-file/default/ARIA/1.0/tests/test-files/testcases-multiselectable/testcase-listbox-multiselectable-C.html

You click the button and a selection add is supposed to be generated.
(Note: We are now operating off a new public list for ARIA instead of
member only). This is in preparation for ARIA 1.1.

Rich