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[Flutter 3]TextPainter does not respect the height factor of text style #104153

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[Flutter 3]TextPainter does not respect the height factor of text style#104153
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P2Important issues not at the top of the work lista: typographyText rendering, possibly libtxtc: regressionIt was better in the past than it is nowengineflutter/engine related. See also e: labels.found in release: 3.0Found to occur in 3.0found in release: 3.1Found to occur in 3.1has reproducible stepsThe issue has been confirmed reproducible and is ready to work onr: fixedIssue is closed as already fixed in a newer version
@WeiCongcong

Description

@WeiCongcong
WeiCongcong
opened on May 19, 2022

Steps to Reproduce

  1. Execute flutter run on the code sample
  2. The computed line height will not respect the height of text style

Expected results:
If the font size is 16, height is 20 / 16 and the textScaleFactor is 1.0, the computed line height should be 20.

Actual results:
The font size is 16, height is 20 / 16 and the textScaleFactor is 1.0, the computed line height is 19.

Code sample 
  double _computeLineHeight() {
    TextSpan text = const TextSpan(
      text: 'This is a Sample',
      style: TextStyle(
        fontSize: 16,
        height: 20 / 16,
      ),
    );
    TextPainter painter = TextPainter(text: text, textDirection: TextDirection.ltr, textScaleFactor: 1.0);
    painter.layout(maxWidth: 200);
    return painter.computeLineMetrics()[0].height;
  }

You can get the code here.

Logs 
[✓] Flutter (Channel stable, 3.0.0, on macOS 11.3.1 20E241 darwin-x64, locale en-CN)
    • Flutter version 3.0.0 at /path/to/libs/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ee4e09cce0 (9 days ago), 2022-05-09 16:45:18 -0700
    • Engine revision d1b9a6938a
    • Dart version 2.17.0
    • DevTools version 2.12.2
    • 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 31.0.0)
    • Android SDK at /path/to/Android/android-sdk-macosx
    • Platform android-31, build-tools 31.0.0
    • ANDROID_HOME = /path/to/Android/android-sdk-macosx
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.10+0-b96-7281165)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.2.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.3

[✓] 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-b96-7281165)

[✓] IntelliJ IDEA Community Edition (version 2021.1.1)
    • IntelliJ at /Applications/IntelliJ IDEA CE.app
    • 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

[✓] VS Code (version 1.67.0)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.40.0

[✓] Connected device (3 available)
    • iPhone 11 (mobile) • 3033A4F1-03F1-465E-BEEC-E21D869D19CD • ios            • com.apple.CoreSimulator.SimRuntime.iOS-13-7 (simulator)
    • macOS (desktop)    • macos                                • darwin-x64     • macOS 11.3.1 20E241 darwin-x64
    • Chrome (web)       • chrome                               • web-javascript • Google Chrome 101.0.4951.64

[!] HTTP Host Availability
    ✗ HTTP host "https://cocoapods.org/" is not reachable. Reason: An error occurred while checking the HTTP host: Connection reset by peer

! Doctor found issues in 1 category.

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    P2Important issues not at the top of the work lista: typographyText rendering, possibly libtxtc: regressionIt was better in the past than it is nowengineflutter/engine related. See also e: labels.found in release: 3.0Found to occur in 3.0found in release: 3.1Found to occur in 3.1has reproducible stepsThe issue has been confirmed reproducible and is ready to work onr: fixedIssue is closed as already fixed in a newer version

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