Summary:
It's easy to accidentally trigger this invariant when adding / moving around a component that relies on a FlatList.
There might be some unexpected behavior when this occurs, i.e. messed up virtualization / viewability logging. But to me, that is a better outcome than crashing the JS context.
Reviewed By: sahrens
Differential Revision: D14975295
fbshipit-source-id: 18015a780a153aae995723b120440be0e55d8e8b