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Fixes [Discrete `Slider` and `RangeSlider` applies thumb padding when using custom Slider shapes](https://github.com/flutter/flutter/issues/161805) ### Code Sample <details> <summary>expand to view the code sample</summary> ```dart import 'package:flutter/material.dart'; void main() => runApp(const RangeSliderExampleApp()); class RangeSliderExampleApp extends StatelessWidget { const RangeSliderExampleApp({super.key}); @override Widget build(BuildContext context) { return MaterialApp( debugShowCheckedModeBanner: false, theme: ThemeData( sliderTheme: const SliderThemeData( trackHeight: 32, trackShape: RectangularSliderTrackShape(), rangeTrackShape: RectangularRangeSliderTrackShape(), thumbColor: Colors.amber, ), ), home: Scaffold( body: Column( spacing: 20.0, mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Slider( value: 100, max: 100, divisions: 100, onChanged: (double value) {}, ), RangeSlider( values: const RangeValues(0, 100), max: 100, divisions: 100, onChanged: (RangeValues values) {}, ), ], ), ), ); } } ``` </details> ### Before <img width="929" alt="Screenshot 2025-03-06 at 13 33 17" src="https://github.com/user-attachments/assets/a089674f-4931-4808-9663-1cd540bf7b11" /> ### After <img width="929" alt="Screenshot 2025-03-06 at 13 33 28" src="https://github.com/user-attachments/assets/77fe5708-f2e4-4734-92c2-46e4d8338d0e" /> ## 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. - [ ] 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
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