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Summary: Hey, `adjustCellsAroundViewport` function was checking if `props.initialScrollIndex` is truthy and -1 was returning true. This caused bugs with rendering for tvOS: https://github.com/react-native-tvos/react-native-tvos/pull/485 There are warnings in the code about `initalScrollIndex` being smaller than 0 but this if statement would still allow that. ## Changelog: [General] [Fixed] - Make sure initialScrollToIndex is bigger than 0 when adjusting cells Pull Request resolved: https://github.com/facebook/react-native/pull/36844 Test Plan: Pass -1 as initialScrollToIndex. Check that this code is executed. Reviewed By: cipolleschi Differential Revision: D44856266 Pulled By: NickGerleman fbshipit-source-id: 781a1c0efeae93f00766eede4a42559dcd066d7d