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<!-- Thanks for filing a pull request! Reviewers are typically assigned within a week of filing a request. To learn more about code review, see our documentation on Tree Hygiene: https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md --> This pr aims to complete #172188 by refactoring all files in `packages/flutter/lib/src/material` to adopt Dart 3.8's null-aware elements feature. Each file was refactored in its own commit for clear, incremental changes and traceable history. ### Motivation Following the https://github.com/flutter/flutter/issues/172188#issuecomment-3076061395, this PR is intentionally scoped to a single folder to keep the review surface manageable. Migrating package by package enables more focused code review, easier troubleshooting, and a safer incremental adoption of the new language feature. ### Approach - **Scope:** Only files under `packages/flutter/lib/src/material` have been refactored. - **Commits:** Each file refactored in its own commit for granularity and traceability. - **Code style:** Changed list element conditionals to use null-aware elements where applicable, improving readability and reducing verbosity. ### Testing - All existing tests were run after each change. - All tests passed except for `chip_test.dart`, which was already failing before these changes and continues to fail after. No new test failures were introduced by this PR. ### Additional Notes - No functional or behavioral changes were made; this is a pure refactor for code clarity and modernization. - Adhering to the incremental migration strategy proposed in the referenced issue for safer and more effective review. --- Ready for review! 🚀 ## 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. - [ ] 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