Anchor tags always gets underline text decoration when not none

[NYJvanMuijlwijk]

Steps to Reproduce

• in the customStylesBuilder, return 'text-decoration': 'line-through' for the anchor tag.
• anchor tags will now display both an underline and the line-through

`HtmlWidget` configuration

    HtmlWidget(
      html,
      customStylesBuilder: (element) => switch (element.localName) {
        case 'a':
          return {'text-decoration': 'line-through'};
        default:
          return null;
      },
      onTapUrl: (url) {
        // handle url
      },
    );

Testing environment

[✓] Flutter (Channel stable, 3.38.9, on macOS 26.2 25C56 darwin-arm64, locale en-NL) [268ms]
    • Flutter version 3.38.9 on channel stable at /Users/niek/Development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 67323de285 (3 weeks ago), 2026-01-28 13:43:12 -0800
    • Engine revision 587c18f873
    • Dart version 3.10.8
    • DevTools version 2.51.1
    • Feature flags: enable-web, enable-linux-desktop, enable-macos-desktop, enable-windows-desktop, enable-android,
      enable-ios, cli-animations, enable-native-assets, omit-legacy-version-file, enable-lldb-debugging

[✓] Android toolchain - develop for Android devices (Android SDK version 36.1.0) [1,184ms]
    • Android SDK at /Users/niek/Library/Android/sdk
    • Emulator version 36.3.10.0 (build_id 14472402) (CL:N/A)
    • Platform android-36, build-tools 36.1.0
    • ANDROID_HOME = /Users/niek/Library/Android/sdk
    • ANDROID_SDK_ROOT = /Users/niek/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.8+-14196175-b1038.72)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 26.2) [676ms]
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Build 17C52
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [6ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Connected device (3 available) [9.9s]
    • iPad Pro 13-inch (M5) (mobile) • 64A5D122-537D-4C41-B861-27506A28FF21 • ios            •
      com.apple.CoreSimulator.SimRuntime.iOS-26-2 (simulator)
    • macOS (desktop)                • macos                                • darwin-arm64   • macOS 26.2 25C56
      darwin-arm64
    • Chrome (web)                   • chrome                               • web-javascript • Google Chrome
      145.0.7632.109

[✓] Network resources [243ms]
    • All expected network resources are available.

• No issues found!

Expected results

Only the given text decoration is displayed. In this case 'line-through' overrides the default 'underline'

Actual results

[daohoangson]

The fix has been released in v0.17.2, please try upgrading and let me know if it works for you.