NestedScrollView extreme scroll jank with BouncingScrollPhysics #73864
Description
NestedScrollView with BouncingScrollPhysics (or running on iOS) exhibits considerable scroll jank with slight movements, including full height toggles.
https://gist.github.com/lukepighetti/36d228fda97b145c6648365f6bcc8d0e#file-nested_scroll_view-dart
Here's a video showing the jank from another project. https://www.youtube.com/watch?v=f5cQ-SHwYbs&feature=youtu.be
Expected results:
Smooth scrolling / no jank.
Actual results:
Jank.
Logs
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, 1.25.0-8.2.pre, on Mac OS X 10.15.7 19H2 darwin-x64,
locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
[✓] Xcode - develop for iOS and macOS (Xcode 12.2)
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.1)
[✓] VS Code (version 1.52.1)
[✓] Connected device (1 available)
! Error: Luke's iPhone is not connected. Xcode will continue when Luke's
iPhone is connected. (code -13)
• No issues found!