SectionList sticky headers drift around when scrolling to the ends

[esprehn]

• [x ] Review the documentation: https://facebook.github.io/react-native
• [ x] Search for existing issues: https://github.com/facebook/react-native/issues
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Environment

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Environment:
OS: macOS High Sierra 10.13.5
Node: 8.9.4
Yarn: 1.5.1
npm: 5.6.0
Watchman: 4.7.0
Xcode: Xcode 9.2 Build version 9C40b
Android Studio: 3.1 AI-173.4720617

Packages: (wanted => installed)
react: 16.2.0 => 16.2.0
react-native: 0.55.0 => 0.55.0

Description

We have a SectionList with sticky headers that's also inverted. The sticky headers seem to jump up and down when scrolling. Sometimes they also drift out of the viewport and then snap back to become stuck.

Reproducible Demo

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[esprehn]

This seems to be the result of getItemHeight reporting incorrect values for some items. The manifestation of that is badly broken scrolling, jumpiness and headers that drift. I'd be nice if VirtualizedList had some debug mode that reported errors when the heights disagreed with each other.

[CharlieOrlando]

@esprehn So did you end up finding a solution? I'm experiencing the same issue, as are other people... #15445

[esprehn]

Our solution was to return the right values from getItemHeight. That said we've moved away from sticky headers because the VirtualizedList impl is really buggy. :/

[Taylor123]

@CharlieOrlando have you been able to solve this at all? Seeing the StickyHeader flicker each time i call scrollToOffset on the FlatList.

This seems to only happen on Android, and works perfectly on iOS. Need to use the StickyHeaders since I can't move the components outside the list