Ensure initial visiblity is computed on view init.

If the isVisible property was set up in such a way that the
_sc_isVisibleDidChange observer did not fire, the isVisibleInWindow
property would not be properly set.

[obsoleted-by-master]
Fix issue with SC.SegmentedView overflow menu not sending the action.

Invoke the destroy of the segmented view's overflow menu until the end of
the runloop, so that the selectedItem observer has a chance to run and
invoke the action for the overflow item.
Bumping to SC 1.9.0.21.