Fix inconsistent state caused in UICollectionViewLayout+InteractiveReordering.#1289

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ofirgluzman wants to merge 1 commit intoInstagram:masterfrom ofirgluzman:interactive-reordering-fix-inconsistent-state

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Commits on Dec 19, 2018

Fix inconsistent state which can be caused in UICollectionViewLayout+InteractiveReordering.
ofirgluzman
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