Summary:
Before:
- Android had the slideout row flash upon render due to it being rendered first
- iOS had the left side of each row load first, then rerender to show entire row when `scrollViewWidth` is available
Reason:
- Android was loading the slideout view first without an opacity check
- iOS was loading the swipeable view with width 0 first then stretching to `scrollViewWidth` when it was available via `onLayout`
Fix:
Render swipeable view with `flex: 1` then render slideout view
Reviewed By: fkgozali
Differential Revision: D3321466
fbshipit-source-id: 92a3b5e22034e06d05986ddb8c348796bafbbf34
62e588bece