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When using VoiceOver, clicking the button through `ctrl+opt+space` causes the browser to send `pointerdown`, `pointerup` and `click` events successively within the same event loop. This case wasn't handled correct by the recent `ClickDebouncer` change here: https://github.com/flutter/flutter/pull/172995 More details: We currently wait until the end of the event loop to set the `ClickDebouncer`'s state. When other events arrive before the end of the event loop, they expect the `state` to already be set. The fix is to set the `state` immediately to allow events to be queued right away, but still keep the debouncing delayed until the end of the event loop so that Safari continues to work correctly (issue: https://github.com/flutter/flutter/issues/172180) Fixes https://github.com/flutter/flutter/issues/173741
Flutter Engine
Setting up the Engine development environment
See here
gclient bootstrap
Flutter engine uses gclient to manage dependencies.
If you've already cloned the flutter repository: