Fix for jumpy rendering of VirtualList with initialScrollIndex prop specified

[rbrosboel]

Is this a bug report?

Yes. Pull request will follow.

Have you read the Contributing Guidelines?

Yes

Environment

Environment:
OS: Windows 10
Node: 8.9.4
Yarn: Not Found
npm: 4.6.1
Watchman: Not Found
Xcode: N/A
Android Studio: Version 3.0.0.0 AI-171.4443003

Packages: (wanted => installed)
react: 16.2.0 => 16.2.0
react-native: https://github.com/expo/react-native/archive/sdk-25.0.0.tar.gz => 0.52.0

Steps to Reproduce

See snack: https://snack.expo.io/Sy_bHbM_z

1. Render SectionList, with initialScrollIndex prop specified
2. Watch how list items jump between first/second rendering

Expected Behavior

List items would render at a consistent position.

Actual Behavior

VirtualizedList with initialScrollIndex specified renders content in different positions for the first/second rendering, causing a noticable jump of the list items.

Reproducible Demo

https://snack.expo.io/Sy_bHbM_z

[rbrosboel]

Pull request: #18105

[stale]

Hey there, it looks like there has been no activity on this issue recently. Has the issue been fixed, or does it still require the community's attention? This issue may be closed if no further activity occurs. You may also label this issue as "For Discussion" or "Good first issue" and I will leave it open. Thank you for your contributions.

[stale]

Closing this issue after a prolonged period of inactivity. If this issue is still present in the latest release, please feel free to create a new issue with up-to-date information.