DraggableScrollableSheet is rebuilding the screen while dragging #67219
Description
Steps to Reproduce
DraggableScrollableSheet is rebuilding the screen while dragging the sheet and it is causing unnecessary flickers.
class MyPopUpSheet extends StatelessWidget {
ScrollController _scrollController; //Needed for
@override
Widget build(BuildContext context) {
return Material(
child: DraggableScrollableSheet(
initialChildSize: 0.4,
minChildSize: 0.4,
builder: (ctx, scrollController) {
print('Rebuilding...');
return CustomScrollView(
controller: scrollController,
slivers: [
SliverToBoxAdapter(child: Container(Colors.deepOrange)),
SliverToBoxAdapter(child: Container(Colors.red)),
SliverToBoxAdapter(child: Container(Colors.green)),
],
);
},
),
);
}
Expected results:
It shouldn't rebuild the widget while dragging the sheet.
Actual results:
Logs
[✓] Flutter (Channel stable, 1.20.4, on Mac OS X 10.15.6 19G73, locale en-IN)
• Flutter version 1.20.4 at /Users/username/Library/Application Support/fvm/versions/1.20.4
• Framework revision fba99f6cf9 (3 weeks ago), 2020-09-14 15:32:52 -0700
• Engine revision d1bc06f032
• Dart version 2.9.2
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
• Android SDK at /Users/username/Library/Android/sdk
• Platform android-29, build-tools 29.0.3
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 11.6)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 11.6, Build version 11E708
• CocoaPods version 1.9.3
[✓] Android Studio (version 4.0)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 49.0.2
• Dart plugin version 193.7547
• Java version OpenJDK Runtime Environment (build 1.8.0_242-release-1644-b3-6222593)
[✓] Connected device (1 available)
• ONEPLUS A6000 (mobile) • 431e5315 • android-arm64 • Android 10 (API 29)
• No issues found!
cc/ @TahaTesser
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Important issues not at the top of the work listA truly polished experienceAffects or could affect many people, though not necessarily a specific customer.Viewports, list views, slivers, etc.Found to occur in 2.0Found to occur in 2.1flutter/packages/flutter repository. See also f: labels.The issue has been confirmed reproducible and is ready to work on