There seems to be a missing method in NSOutlineView.
You can know an item is expanded only if its parent is expanded (so
that the item itself is visible).
This is problematic if you want to cache the current list of expanded
items. Instead of just iterating through the item hierarchy when
needed, you would need to use the notifications sent when an item is
about to be disclosed or closed.
This is a bit strange if you consider that NSOutlineView probably
caches this information in _expandSet or _expandSetToExpandItemsInto
so that it can remember to expand the children of an item if needed.
An I missing something and is there a way to know which items are
expanded (either visible or not)?
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