ae60ae4074
Summary: <!-- Thank you for sending the PR! We appreciate you spending the time to work on these changes. Help us understand your motivation by explaining why you decided to make this change. You can learn more about contributing to React Native here: http://facebook.github.io/react-native/docs/contributing.html Happy contributing! --> There's a positioning bug in `VirtualizedList` when `ItemSeparatorComponent` is defined for a list in horizontal or inverted mode. And also we face this bug in `FlatList`, because it is using `VirtualizedList` to render lists. This commit will fix the [#15777](https://github.com/facebook/react-native/issues/15777). Before fix: ``` <FlatList ... horizontal={true} inverted={true} ... /> ```  ``` <FlatList ... horizontal={true} inverted={false} ... /> ```  I ran this code with all possible values of `horizontal` and `inverted` props in `FlatList` and `VirtualizedList` and the results of each run was as below: After fix bug: ``` <FlatList ... horizontal={true} inverted={false} ... /> ```  ``` <FlatList ... horizontal={true} inverted={true} ... /> ```  Closes https://github.com/facebook/react-native/pull/15865 Differential Revision: D5797266 Pulled By: hramos fbshipit-source-id: 7d44fa797dbd9e83eb2bdd7833e9dd9707d9d822 |
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| .. | ||
| __snapshots__ | ||
| FillRateHelper-test.js | ||
| FlatList-test.js | ||
| SectionList-test.js | ||
| ViewabilityHelper-test.js | ||
| VirtualizeUtils-test.js | ||
| VirtualizedList-test.js | ||
