Add more tests to events/test_selection.html (started in bug 569653). Removes, multiples etc.
Fixed WFM because of good test coverage in bug 673958.
(In reply to Marco Zehe (:MarcoZ) from comment #1)
> Fixed WFM because of good test coverage in bug 673958.
we could say it's fixed by bug 414302 where I added some selection tests (bug 673958 was about focus events).