[react-interactions] Remove Focus/FocusWithin root event types #17555
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necolas
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Dec 9, 2019
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This PR refactors the Focus and FocusWithin event responders to remove their root event types. Instead, we attach a set of events to the window once and track focus visible and other properties as globals. We then track the same events in the target phase of the responders and correleate behaviors to ensure the same expectations from before continue to be valid.
This will have a big impact on performance and memory, as having possibly thousands of root events subscribed at once can impact performance.