Chris Bracken 93f6d81c75 Accessibility: emit FOCUS_CHANGED events (flutter/engine#30091)
When calling Unserialize on an AXTreeUpdate, check whether the focus_id
has changed. If so, emit a FOCUS_CHANGED event from the event generator.
This allows the platform-specific FlutterPlatformNodeDelegate
implementations to handle focus changes originating from the framework,
and trigger the appropriate operating system focus-changed
notifications.

Issue: https://github.com/flutter/flutter/issues/77838
2021-12-02 18:14:15 -08:00
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