Fix chip widgets don't the apply provided iconTheme (#135751)
fixes [`Chip.iconTheme` does not apply the icon theme](https://github.com/flutter/flutter/issues/111828)
### Description
- Fix chip widgets that don't utilize the provided `iconTheme`.
- Prevent `iconTheme` with just color from overriding the default icon size.
- Add some missing M3 tests for the chip and chip theme properties.
### Code sample
<details>
<summary>expand to view the code sample</summary>
```dart
import 'package:flutter/material.dart';
void main() => runApp(const MyApp());
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: ThemeData(useMaterial3: true),
home: const Example(),
);
}
}
class Example extends StatefulWidget {
const Example({super.key});
@override
State<Example> createState() => _ExampleState();
}
class _ExampleState extends State<Example> {
final bool _isEnable = true;
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
RawChip(
iconTheme: const IconThemeData(color: Colors.amber),
avatar: const Icon(Icons.favorite_rounded),
label: const Text('RawChip'),
onPressed: () {},
isEnabled: _isEnable,
),
const Chip(
iconTheme: IconThemeData(color: Colors.amber),
avatar: Icon(Icons.favorite_rounded),
label: Text('Chip'),
// onDeleted: () {},
),
FilterChip(
iconTheme: const IconThemeData(color: Colors.amber),
avatar: const Icon(Icons.favorite_rounded),
label: const Text('FilterChip'),
selected: false,
onSelected: _isEnable ? (bool value) {} : null,
),
InputChip(
iconTheme: const IconThemeData(color: Colors.amber),
avatar: const Icon(Icons.favorite_rounded),
label: const Text('InputChip'),
isEnabled: _isEnable,
onPressed: () {},
),
ActionChip(
iconTheme: const IconThemeData(color: Colors.amber),
avatar: const Icon(Icons.favorite_rounded),
label: const Text('ActionChip'),
onPressed: _isEnable ? () {} : null,
),
ChoiceChip(
iconTheme: const IconThemeData(color: Colors.amber),
avatar: const Icon(Icons.favorite_rounded),
label: const Text('ChoiceChip'),
selected: false,
onSelected: _isEnable ? (bool value) {} : null,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: () {},
child: const Icon(Icons.add),
),
);
}
}
```
</details>
### Before
### After
f65dd3bac0