Loïc Sharma 218151583f [Windows] Introduce an accessibility plugin (flutter/engine#50975) ...

_This is the same pull request as https://github.com/flutter/engine/pull/50898. GitHub broke on the previous pull request so I re-created it_

This moves the logic to handle `flutter/accessibility` messages to a new type, `AccessibilityPlugin`. 

Notable changes:

1. Windows app no longer crashes if it receives accessibility events it does not support
2. Windows app no longer crashes if it receives accessibility events while in headless mode

@yaakovschectman After playing around with this, I ended up using a different pattern than what what I suggested on https://github.com/flutter/engine/pull/50598#discussion_r1488728089. This message handler is simple enough that splitting into a child/base types felt like unnecessary boilerplate. The key thing is separating messaging and implementation logic, which was achieved through the `SetUp` method. Let me know what you think, and sorry for all my flip-flopping on this topic! 😅

This is preparation for: https://github.com/flutter/flutter/issues/143765

Sample app for manual testing: https://github.com/flutter/flutter/issues/113059

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style

2024-02-27 20:59:24 +00:00

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src/flutter

[Windows] Introduce an accessibility plugin (flutter/engine#50975)

2024-02-27 20:59:24 +00:00