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Changes default mouse cursor of Material buttons to basic arrow instead of click as per updated Android guidance. For each Material button, I did the following: 1. Changed the default mouse cursor to the basic arrow. 2. Added a way to configure the mouse cursor of the button if a method did not exist before. 3. Added a test to ensure that the default mouse cursor is now the basic arrow (or modified an existing one if applicable). 4. Added a test to ensure that the customization of button mouse cursors still works (if currently untested). The list of Material buttons I modified (supposed to be all of them): - RawMaterialButton - DropdownButton - FloatingActionButton - ToggleButtons - ElevatedButton - IconButton - FilledButton - OutlinedButton - PopupMenuItem - InkWell - TextButton - MaterialButton - DropdownMenuItem - DropdownButtonFormField - BackButton - CloseButton - DrawerButton - EndDrawerButton - PopupMenuButton - MenuItemButton - CheckboxMenuButton - RadioMenuButton - MenuBar - SubmenuButton - SegmentedButton - FilterChip - ChoiceChip - ActionChip - InputChip Fixes https://github.com/flutter/flutter/issues/170296. ## 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 --------- Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>