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[webview_flutter] Multiple WebViews on the screen are flickering on iphone 13 pro 120hz display #99151

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[webview_flutter] Multiple WebViews on the screen are flickering on iphone 13 pro 120hz display#99151
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P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)c: renderingUI glitches reported at the engine/skia or impeller rendering levele: device-specificOnly manifests on certain devicesp: webviewThe WebView pluginpackageflutter/packages repository. See also p: labels.perf: speedPerformance issues related to (mostly rendering) speedplatform-iosiOS applications specificallyr: fixedIssue is closed as already fixed in a newer version

Description

@piotrmoskala
piotrmoskala
opened on Feb 25, 2022

Details

Hey! 👋 I am using few WebViews as a rows in ListView widget, I know that WebView is pretty expensive widget but I found out such an interesting case when using/testing WebViews (can be blank no matter what's inside) in ListView. It causes flickering of whole interface. There are some issues with similar behaviour but not exactly the same. I am on Flutter 2.10.1 (Stable)

It is happening for me only on 120hz screen of iPhone 13 Pro. Couldn't reproduce it on simulator.

Target Platform: iOS
Target OS version/browser: 15.3.1
Devices:iPhone 13 Pro

webview_flutter: ^3.0.1

Screen recording

RPReplay_Final1645794871.2.mov

Reproduce code

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Test app'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Expanded(
              child: ListView.builder(
                itemCount: 20,
                itemBuilder: ((context, index) {
                  return Container(
                    margin: const EdgeInsets.all(10),
                    height: 200,
                    child: const WebView(
                      initialUrl: 'https://flutter.dev',
                    ),
                  );
                }),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Logs

Logs

After running flutter run --profile --trace-skia

[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x110f14f00 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3132, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x110f140c0 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3138, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x110f14d20 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3139, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x110f14720 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3140, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x10aef8360 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3145, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x110f148a0 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3144, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x10aef82a0 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3143, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x10aef93e0 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3150, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x110f15380 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3149, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}>
[ProcessSuspension] 0x110f144e0 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3148, error: Error Domain=RBSServiceErrorDomain Code=1 "target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit" UserInfo={NSLocalizedFailureReason=target is not running or doesn't have entitlement com.apple.runningboard.assertions.webkit}
[assertion] Error acquiring assertion: <Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process does not exist" UserInfo={NSLocalizedFailureReason=Specified target process does not exist}>
[ProcessSuspension] 0x10aef9200 - ProcessAssertion: Failed to acquire RBS assertion 'ConnectionTerminationWatchdog' for process with PID=3146, error: Error Domain=RBSAssertionErrorDomain Code=2 "Specified target process does not exist" UserInfo={NSLocalizedFailureReason=Specified target process does not exist}
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Could not signal service com.apple.WebKit.WebContent: 113: Could not find specified service
Flutter Doctor 
[✓] Flutter (Channel stable, 2.10.1, on macOS 12.0.1 21A559 darwin-arm, locale en-PL)
    • Flutter version 2.10.1 at /Users/piotrmoskala/Developer/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision db747aa133 (2 weeks ago), 2022-02-09 13:57:35 -0600
    • Engine revision ab46186b24
    • Dart version 2.16.1
    • DevTools version 2.9.2

[✓] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
    • Android SDK at /Users/piotrmoskala/Library/Android/sdk
    • Platform android-32, build-tools 32.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7249189)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.2

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2020.3)
    • 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 11.0.10+0-b96-7249189)

[✓] VS Code (version 1.64.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.34.0

[✓] Connected device (3 available)
    • Piotr’s iPhone (mobile)             • 00008110-00144C1E2269801E            • ios            • iOS 15.1.1 19B81
    • iPad mini (6th generation) (mobile) • 5C51AC4C-C318-404F-95CD-8A39B868F95B • ios            • com.apple.CoreSimulator.SimRuntime.iOS-15-2 (simulator)
    • Chrome (web)                        • chrome                               • web-javascript • Google Chrome 98.0.4758.109

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

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    P2Important issues not at the top of the work listc: performanceRelates to speed or footprint issues (see "perf:" labels)c: renderingUI glitches reported at the engine/skia or impeller rendering levele: device-specificOnly manifests on certain devicesp: webviewThe WebView pluginpackageflutter/packages repository. See also p: labels.perf: speedPerformance issues related to (mostly rendering) speedplatform-iosiOS applications specificallyr: fixedIssue is closed as already fixed in a newer version

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