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Nick Gerleman
c168a4f88b
Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/38655 https://github.com/facebook/react-native/pull/35993 added logic in VirtualizedList to support `maintainVisibleContentPosition`. This logic makes sure that a previously visible cell being used as an anchor remains rendered after new content is added. The strategy here is to calculate the difference in previous and new positions of the anchor, and move the render window to its new location during item change. `minIndexForVisible` is used as this anchor. When an item change moves the anchor to a position below `minIndexForVisible`, shifting the render window may result in a window which starts before zero. This fixes up `_constrainToItemCount()` to handle this. Changelog: [General][Fixed] - Fix invariant violation when `maintainVisibleContentPosition` adjustment moves window before list start Reviewed By: yungsters Differential Revision: D47846165 fbshipit-source-id: 8a36f66fdad321acb255745dad85618d28c54dba