Repository: flutter
Issue: [Web][CanvasKit]: TextStyle Linethrough / strikethrough not rendered in browser, while html renders it properly
Labels: engine,platform-web,e: web_canvaskit,has reproducible steps,P2,found in release: 2.0,found in release: 2.2,team-web,triaged-web

## Steps to Reproduce

<!-- You must include full steps to reproduce so that we can reproduce the problem. -->
1. use the following snippet on platform "web"
2. use the same snippet on another platform, such as "macos"
3. compare the results

```dart
import 'package:flutter/material.dart';

class NullDashText extends StatelessWidget {
  const NullDashText({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Text(
      '   ',
      style: Theme.of(context).textTheme.bodyText2?.copyWith(
          decoration: TextDecoration.lineThrough,
          color:
              Theme.of(context).textTheme.bodyText1!.color!.withOpacity(0.54)),
    );
  }
}
```

**Expected results:** <!-- what did you want to see? -->
The results are identical

**Actual results:** <!-- what did you see? -->
On platforms other than web I am seeing a thin grey horizontal line. On the platform web I am not seeing anything.

<details>
  <summary>Logs</summary>

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      log output below between the lines with the backticks. If there is an
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```
```

<!--
     Run `flutter analyze` and attach any output of that command below.
     If there are any analysis errors, try resolving them before filing this issue.
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```
```

<!-- Finally, paste the output of running `flutter doctor -v` here. -->

```
flutter doctor -v
[✓] Flutter (Channel stable, 2.0.5, on macOS 11.2.3 20D91 darwin-arm, locale en-DE)
    • Flutter version 2.0.5 at /Users/tilo/development/flutter
    • Framework revision adc687823a (3 days ago), 2021-04-16 09:40:20 -0700
    • Engine revision b09f014e96
    • Dart version 2.12.3

[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at /Users/tilo/Library/Android/sdk
    • Platform android-S, build-tools 30.0.3
    • ANDROID_SDK_ROOT = /Users/tilo/Library/Android/sdk
    • 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-b3-6915495)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 12.4, Build version 12D4e
    • CocoaPods version 1.10.1

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio
    • Android Studio at /Applications/Android Studio 4.2 Preview.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 11.0.8+10-b944.6916264)

[✓] Android Studio (version 4.1)
    • 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 1.8.0_242-release-1644-b3-6915495)

[✓] IntelliJ IDEA Community Edition (version 2021.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • Flutter plugin version 55.1.5
    • Dart plugin version 211.6693.108

[✓] VS Code (version 1.55.2)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.21.0

[✓] Connected device (2 available)
    • macOS (desktop) • macos  • darwin-arm64   • macOS 11.2.3 20D91 darwin-arm
    • Chrome (web)    • chrome • web-javascript • Google Chrome 89.0.4389.128

• No issues found!
```

</details>