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This pull request is created by [automatic cherry pick workflow](https://github.com/flutter/flutter/blob/main/docs/releases/Flutter-Cherrypick-Process.md#automatically-creates-a-cherry-pick-request) Please fill in the form below, and a flutter domain expert will evaluate this cherry pick request. ### Issue Link: What is the link to the issue this cherry-pick is addressing? https://github.com/flutter/flutter/issues/176360 ### Changelog Description: Explain this cherry pick in one line that is accessible to most Flutter developers. See [best practices](https://github.com/flutter/flutter/blob/main/docs/releases/Hotfix-Documentation-Best-Practices.md) for examples Fix accessibility events regression on Linux which makes apps not announced with screen reader. ### Impact Description: What is the impact (ex. visual jank on Samsung phones, app crash, cannot ship an iOS app)? Does it impact development (ex. flutter doctor crashes when Android Studio is installed), or the shipping production app (the app crashes on launch) The Linux accessibility code was not correctly updated to new API which caused the focus events to no longer be reported. This means using a Linux app with an accessibility tool like a screen reader to not function correctly. ### Workaround: Is there a workaround for this issue? No workaround other than using a version of Flutter < 3.25. ### Risk: What is the risk level of this cherry-pick? ### Test Coverage: Are you confident that your fix is well-tested by automated tests? ### Validation Steps: What are the steps to validate that this fix works? 1. Create a basic skeleton app with text buttons 2. Turn on the screen reader 3. Focus a button, and hear announcement when the button gets focus
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