* When RemoveSelf() is called, we do not own our own layout items, so
we must not delete them.
* However, we do own them when we still have layout items left when
we get deleted ourselves.
* This fixes removing/adding a child view to a view without deleting
it inbetween (like the new Network preferences will do).
* Optimized item removal -- not a good idea to always remove item 0.
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