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VirtualizedList: fix bug where onViewableItemsChanged wouldn't trigger
Summary: In the current implementation of the `VirtualizedList` the `onViewableItemsChanged` callback wouldn't trigger if the underlying list data changes. (see example snack https://snack.expo.io/Hk5703eBb) I added a method in the `ViewabilityHelper` to invalidate the cached viewableIndices, which gets triggered when the list-data changes. Closes #14922 Differential Revision: D5864537 Pulled By: sahrens fbshipit-source-id: 37f617763596244208548817d5b138dadc12c75d
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