Bug 1506791 - drag reorder and delete is crashing. let's not. #4390
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The fix is to ignore the drag and reload the collection view.
It would be nice-to-have if the drag could be animated back to exit the
drag state, but Apple APIs do not expose that level of control. All we
can do is ignore the drag.
I was trying to do something similar before this patch (by just ignoring the drag), but that was insufficient, the collection view needs to be reloaded fully.