Taha Tesser 850d76db74
Fix Material 3 Dialog default background color (#151400)
fixes [[Material 3] Wrong `Dialog` background color from ColorScheme](https://github.com/flutter/flutter/issues/148849
)

### Code sample

<details>
<summary>expand to view the code sample</summary> 

```dart
import 'package:flutter/material.dart';

/// Flutter code sample for [showDialog].

void main() => runApp(const ShowDialogExampleApp());

class ShowDialogExampleApp extends StatelessWidget {
  const ShowDialogExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: const DialogExample(),
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.green,
          surfaceContainerHigh: Colors.amber,
        ),
      ),
    );
  }
}

class DialogExample extends StatelessWidget {
  const DialogExample({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('showDialog Sample')),
      body: Center(
        child: OutlinedButton(
          onPressed: () => _dialogBuilder(context),
          child: const Text('Open Dialog'),
        ),
      ),
    );
  }

  Future<void> _dialogBuilder(BuildContext context) {
    return showDialog<void>(
      context: context,
      builder: (BuildContext context) {
        return AlertDialog(
          title: const Text('Basic dialog title'),
          content: const Text(
            'A dialog is a type of modal window that\n'
            'appears in front of app content to\n'
            'provide critical information, or prompt\n'
            'for a decision to be made.',
          ),
          actions: <Widget>[
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Disable'),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
            TextButton(
              style: TextButton.styleFrom(
                textStyle: Theme.of(context).textTheme.labelLarge,
              ),
              child: const Text('Enable'),
              onPressed: () {
                Navigator.of(context).pop();
              },
            ),
          ],
        );
      },
    );
  }
}
```

</details>

### Before

<img width="674" alt="Screenshot 2024-07-08 at 14 26 39" src="https://github.com/flutter/flutter/assets/48603081/a95160f5-947e-4a6e-a3a5-82c94980c744">

### After

<img width="674" alt="Screenshot 2024-07-08 at 14 26 28" src="https://github.com/flutter/flutter/assets/48603081/fa912519-2a79-4fd5-a695-6e18542f0005">
2024-07-09 19:55:47 +00:00
..
2024-04-09 19:35:07 +00:00
2024-06-06 21:41:22 +00:00
2024-04-09 19:35:07 +00:00