Martin Rädlinger 6747a36f5d 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 https://github.com/facebook/react-native/pull/14922

Differential Revision: D5864537

Pulled By: sahrens

fbshipit-source-id: 37f617763596244208548817d5b138dadc12c75d
2017-10-16 04:35:05 -07:00
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