Repository: flutter
Issue: Keyboard events, dead code, should not generate character
Labels: a: text input,framework,a: internationalization,has reproducible steps,P2,team-framework,triaged-framework,fyi-text-input,found in release: 3.24,found in release: 3.25

### Steps to reproduce

1. Run the sample code.
2. Switch to FR input method.
3. Click "[".
4. Click "e".

### Expected results

The first keystroke does not generate character.
The second keystroke generates `ê`.

### Actual results

The first keystroke generates `^`.
The second keystroke generates `ê`.

### Code sample

<details open><summary>Code sample</summary>

```dart
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Keyboard Event Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const KeyboardEventPage(),
    );
  }
}

class KeyboardEventPage extends StatefulWidget {
  const KeyboardEventPage({super.key});

  @override
  _KeyboardEventPageState createState() => _KeyboardEventPageState();
}

class _KeyboardEventPageState extends State<KeyboardEventPage> {
  final List<String> _lastKeyEvents = [];
  final FocusNode _focusNode = FocusNode();

  @override
  Widget build(BuildContext context) {
    final child = Scaffold(
      appBar: AppBar(
        title: const Text('Keyboard Event Demo'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'Press any key:',
              style: TextStyle(fontSize: 20),
            ),
            const SizedBox(height: 20),
            for (final keyEvent in _lastKeyEvents)
              Text(
                keyEvent,
                style: const TextStyle(fontSize: 16),
              ),
          ],
        ),
      ),
    );
    return FocusScope(
      autofocus: true,
      child: Focus(
        autofocus: true,
        canRequestFocus: true,
        focusNode: _focusNode,
        onKeyEvent: (node, event) {
          setState(() {
            _lastKeyEvents.add(event.toString());
            if (_lastKeyEvents.length > 10) {
              _lastKeyEvents.removeAt(0);
            }
          });
          return KeyEventResult.handled;
        },
        child: child,
      ),
    );
  }
}
```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

![image](https://github.com/user-attachments/assets/c1a39d78-6d58-4996-94a9-17fa5ffdd8f3)

</details>


### Logs

<details open><summary>Logs</summary>

```console
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[√] Flutter (Channel stable, 3.24.1, on Microsoft Windows [Version 10.0.22631.4037], locale en-US)
    • Flutter version 3.24.1 on channel stable at D:\DevEnv\flutter\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 5874a72aa4 (6 days ago), 2024-08-20 16:46:00 -0500
    • Engine revision c9b9d5780d
    • Dart version 3.5.1
    • DevTools version 2.37.2

[√] Windows Version (Installed version of Windows is version 10 or higher)

[!] Android toolchain - develop for Android devices (Android SDK version 35.0.0)
    • Android SDK at C:\Users\Administrator\AppData\Local\Android\sdk
    X cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    X Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/to/windows-android-setup for more details.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files\Google\Chrome\Application\chrome.exe

[√] Visual Studio - develop Windows apps (Visual Studio Community 2022 17.10.3)
    • Visual Studio at C:\Program Files\Microsoft Visual Studio\2022\Community
    • Visual Studio Community 2022 version 17.10.35013.160
    • Windows 10 SDK version 10.0.26100.0

[√] Android Studio (version 2024.1)
    • Android Studio at C:\Program Files\Android\Android Studio
    • 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 17.0.10+0--11609105)

[√] VS Code (version 1.92.2)
    • VS Code at C:\Users\Administrator\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.94.0

[√] Connected device (3 available)
    • Windows (desktop) • windows • windows-x64    • Microsoft Windows [Version 10.0.22631.4037]
    • Chrome (web)      • chrome  • web-javascript • Google Chrome 127.0.6533.120
    • Edge (web)        • edge    • web-javascript • Microsoft Edge 128.0.2739.42

[√] Network resources
    • All expected network resources are available.

! Doctor found issues in 1 category.

```

</details>