0357b45337
This PR makes Flutter support `clipRSuperellipse`, and apply it to `CupertinoAlertDialog`. Hit tests related to RSuperellipse are performed based on its bounding box, since the computation is too complicated and pixel perfect hit test is not needed practically. Native: <img src="https://github.com/user-attachments/assets/8f9b472a-e624-4eef-9cea-e81b80f32b86" width="400"/> Native vs before: (The two screenshots are stacked and offset by (1, 1) pixels. See the bottom right corner for comparison.) <img src="https://github.com/user-attachments/assets/ffaf62fc-a82f-4c7a-9ff1-52374f4f2a67" width="400"/> Native vs after: <img src="https://github.com/user-attachments/assets/3dfde2b0-bcc6-492a-8d97-ecabdf97f6f0" width="400"/> After only: <img src="https://github.com/user-attachments/assets/32b2a665-a0da-498f-acdb-598553940964" width="400"/> ## Pre-launch Checklist - [ ] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [ ] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [ ] I read and followed the [Flutter Style Guide], including [Features we expect every widget to implement]. - [ ] I signed the [CLA]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] 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. - [ ] 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