Introduce CircularProgressIndicator.padding
for the updated M3 specs (#159271)
Fix [Add `CircularProgressIndicator` padding to match M3
specs](https://github.com/flutter/flutter/issues/159267)
### 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,
home: Scaffold(
body: Center(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Container(
width: 40,
height: 40,
color: Colors.red,
alignment: Alignment.center,
child: const Text(
'40x40px',
style: TextStyle(fontSize: 8, color: Colors.white),
),
),
const ColoredBox(
color: Colors.amber,
child: CircularProgressIndicator(
year2023: false,
value: 0.4,
),
),
Container(
width: 48,
height: 48,
color: Colors.red,
alignment: Alignment.center,
child: const Text(
'48x48px',
style: TextStyle(fontSize: 10, color: Colors.white),
),
)
],
),
),
),
);
}
}
```
</details>
### Preview
<img width="454" alt="Screenshot 2024-11-21 at 17 13 25"
src="https://github.com/user-attachments/assets/6f7520f1-a213-4814-8116-6dd996639eec">
### Specs

## Pre-launch Checklist
- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [ ] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
If you need help, consider asking for advice on the #hackers-new channel
on [Discord].
<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md