[Impeller] Flutter 3.13.0 regression of box shadow from container with partial border radius drawn over scrollable #132936
Description
Is there an existing issue for this?
- I have searched the existing issues
- I have read the guide to filing a bug
Steps to reproduce
-
Create a Container with box shadow and bottom left border radius (actually any partial border radius reproduces the bug) at the top. Place a ListView below it with some simple text items. See sample code for details.
-
Run on iOS with impeller enabled and disabled and compare results.
flutter run --enable-impeller
flutter run --no-enable-impeller
- Scroll the list and observe the extra white background on the text 'item x' of the list when Impeller is used.
This bug does not reproduce on Flutter 3.10.6 on the same device. Also it does not reproduce on Android with Flutter 3.13.0 with the flag --enable-impeller. The border radius on the box shadowed container must be partial to reproduce the bug.
Expected results
No extra white box should be drawn over the box shadow while scrolling the list.
Actual results
Extra white box is drawn over the box shadow after the list is scrolled. If scrolled up for the first time, the extra white blinks.
Code sample
Code sample
import 'package:flutter/material.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Box shadow with impeller bug',
home: Scaffold(
appBar: PreferredSize(preferredSize: const Size.fromHeight(60), child: Container(
decoration: const BoxDecoration(
color: Colors.white, // Background color can be removed and this bug still reproduces.
borderRadius: BorderRadius.only(bottomLeft: Radius.circular(30)), // BorderRadius.circular(30) does not reproduce the bug.
boxShadow: [BoxShadow(color: Colors.black,blurRadius: 120)],
),
)),
body: ListView.builder(
physics: const BouncingScrollPhysics(),
itemBuilder: (context, index) => index < 100 ? Padding(padding: const EdgeInsets.all(16), child: Center(child: Text('item $index'))) : null
),
),
);
}
}Screenshots or Video
Screenshots / Video demonstration
IMG_0059.MOV
Flutter Doctor output
Doctor output
[✓] Flutter (Channel stable, 3.13.0, on macOS 12.6.1 21G217 darwin-x64, locale en-US)
• Flutter version 3.13.0 on channel stable at /Users/jipeng/Desktop/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision efbf63d9c6 (5 days ago), 2023-08-15 21:05:06 -0500
• Engine revision 1ac611c64e
• Dart version 3.1.0
• DevTools version 2.25.0
• Pub download mirror https://pub.flutter-io.cn
• Flutter download mirror https://storage.flutter-io.cn
[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
• Android SDK at /Users/xxx/Library/Android/sdk/
• Platform android-32, build-tools 32.0.0
• ANDROID_HOME = /Users/xxx/Library/Android/sdk/
• Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)
• All Android licenses accepted.
[✓] Xcode - develop for iOS and macOS (Xcode 14.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 14C18
• CocoaPods version 1.11.2
[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome
[✓] Android Studio (version 2021.3)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/9212-flutter
• Dart plugin can be installed from:
🔨 https://plugins.jetbrains.com/plugin/6351-dart
• Java version OpenJDK Runtime Environment (build 11.0.13+0-b1751.21-8125866)
[✓] Connected device (3 available)
• xxx (mobile) • xxx-xxx • ios • iOS 15.6.1 19G82
• macOS (desktop) • macos • darwin-x64 • macOS 12.6.1 21G217 darwin-x64
• Chrome (web) • chrome • web-javascript • Google Chrome 116.0.5845.96
[✓] Network resources
• All expected network resources are available.
• No issues found!Metadata
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Critical issues such as a build break or regressionIt was better in the past than it is nowImpeller rendering backend issues and features requestsflutter/engine related. See also e: labels.Found to occur in 3.13Found to occur in 3.14The issue has been confirmed reproducible and is ready to work oniOS applications specificallyIssue is closed as already fixed in a newer versionOwned by Engine teamTriaged by Engine team