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See the conversation at https://github.com/dart-lang/sdk/issues/59764#issuecomment-3599823329 for more context. Prior to this, these `Color` fix_data rules would only be visible to users that explicitly import `package: flutter/painting.dart`. This PR broadens the applicability of these rules so they are visible for users that import `dart:ui`, or import any one of the `flutter/` packages that expose `Color`. #### Enabling `Color` fix_data fixes for `dart:ui`: - Adds a `fix_data.yaml` file for `'dart:ui'` fixes to `engine/src/flutter/lib/ui/`. This contains `Color` fixes copied from `packages/flutter/lib/fix_data/fix_painting.yaml`. - Typically `fix_data` files go in a Dart package's `lib/` directory. But `dart:ui` is not a standard Dart package and doesn't have a typical `lib` directory. This directory is the closest thing to a `lib` directory for the `dart:ui` package that I can find. It contains the Dart code that implements the `dart:ui` package. - The actual Dart package for `dart:ui` is generated by `engine/src/flutter/sky/packages/sky_engine/BUILD.gn` with the package name `sky_engine`. I updated the build rule to copy the new `fix_data.yaml` file into the generated `sky_engine/lib/` directory. #### Enabling `Color` fix_data fixes for `package:flutter/` libraries: - The `Color` fixes from `packages/flutter/lib/fix_data/fix_painting.yaml` are remove, and copied to over to a new `packages/flutter/lib/fix_data/fix_dart_ui.yaml` file. - This fix_data file specifies all the `flutter/` libraries which export `Color`. With this change, importing any of these libraries will surface the `Color` fixes, rather than only surfacing the fixes only when `package:flutter/painting.dart` is specifically imported. #### Other related changes - Updates some entries in `fix_cupertino.yaml` and `fix_material.yaml` which used the old `Color.withOpacity` method. - Updates existing flutter package `test_fixes` tests. - The color tests from the `painting` `test_fixes` test are moved to a new `dart_ui` test. Note that this only runs the test with only one of the `flutter/` libraries specified in `fix_dart_ui.yaml` (`animation.dart`). Ideally I think we should run this test while independently importing each one of the `flutter/` libraries specified in `fix_dart_ui.yaml`. But AFAICT there's no easy way to do this without creating a lot of duplicate code. - There is no `fix_data` test for `dart:ui`. Because this isn't a standard Dart library, I don't think there's an easy way to test its `fix_data.yaml` in a similar way to the `flutter/` library fixes. Somewhat fixes #180933 (makes the fixes more broadly available). Somewhat addresses https://github.com/dart-lang/sdk/issues/59764#issuecomment-3599823329 (establishes a way to use `fix_data.yaml` files for `dart:X` libraries). ## 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]. - [x] I followed the [breaking change policy] and added [Data Driven Fixes] where supported. - [x] All existing and new tests are passing. 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If you find its comments useful you can update your code accordingly, but if you are unsure or disagree with the feedback, please feel free to wait for a Flutter team member's review for guidance on which automated comments should be addressed. <!-- 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