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This PR relands https://github.com/flutter/engine/pull/46829, which got reverted in https://github.com/flutter/engine/pull/47086 because of https://github.com/flutter/flutter/issues/136857. There are no changes in the PR compared to the reverted one. The issue are missing `keyup` events in the integration test, which triggers assertion in `KeyboardBindings` and which should be fixed by https://github.com/flutter/flutter/pull/136874. Changes: - Raw keyboard event is handled during capture phase. This is to ensure that the framework processes the event before reaching to IME text area and raw keyboard can stop the propagation for handled events. - `RawKeyboard` event handler is invoked from `KeyboardBinding` event handler. This is to prevent race condition because both handlers now run in capture phase and `KeyboardBinding` needs to process the event first. ## 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] and the [C++, Objective-C, Java style guides]. - [ ] I listed at least one issue that this PR fixes in the description above. - [ ] I added new tests to check the change I am making or feature I am adding, or the PR is [test-exempt]. See [testing the engine] for instructions on writing and running engine tests. - [ ] I updated/added relevant documentation (doc comments with `///`). - [ ] I signed the [CLA]. - [ ] 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/wiki/Tree-hygiene#overview [Tree Hygiene]: https://github.com/flutter/flutter/wiki/Tree-hygiene [test-exempt]: https://github.com/flutter/flutter/wiki/Tree-hygiene#tests [Flutter Style Guide]: https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style [testing the engine]: https://github.com/flutter/flutter/wiki/Testing-the-engine [CLA]: https://cla.developers.google.com/ [flutter/tests]: https://github.com/flutter/tests [breaking change policy]: https://github.com/flutter/flutter/wiki/Tree-hygiene#handling-breaking-changes [Discord]: https://github.com/flutter/flutter/wiki/Chat
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