Fix: How to dispose a StateFullWidget which has AutomaticKeepAliveClientMixin?

 In Flutter, if you have a `StatefulWidget` that uses `AutomaticKeepAliveClientMixin` and you want to manually dispose of it, you can do so in the `dispose` method of the widget. However, you should call `super.dispose()` to ensure that the automatic state restoration functionality works correctly. Here's how you can do it:

```dart

import 'package:flutter/material.dart';

class KeepAliveExample extends StatefulWidget {

  @override

  _KeepAliveExampleState createState() => _KeepAliveExampleState();

}

class _KeepAliveExampleState extends State<KeepAliveExample> with AutomaticKeepAliveClientMixin {

  // Override wantKeepAlive to return true so that the state is kept alive.

  @override

  bool get wantKeepAlive => true;

  // Dispose the state when no longer needed.

  @override

  void dispose() {

    super.dispose(); // Call super.dispose() first

    // Additional cleanup if needed

  }

  @override

  Widget build(BuildContext context) {

    super.build(context); // Call super.build(context) to ensure the state is kept alive.

    return Container(

      child: Text('Keep Alive Example'),

    );

  }

}

```

In the code above:

1. We have a `StatefulWidget` named `KeepAliveExample` that uses `AutomaticKeepAliveClientMixin`.

2. We override the `wantKeepAlive` getter to return `true` to indicate that we want to keep the state alive.

3. In the `dispose` method, we call `super.dispose()` first to ensure that the automatic state restoration functionality works correctly. After that, you can perform any additional cleanup or disposal tasks if needed.

By calling `super.dispose()` and implementing your custom disposal logic, you can effectively dispose of a `StatefulWidget` that uses the `AutomaticKeepAliveClientMixin` while ensuring proper behavior when the widget is recreated.