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Andrew Clark
6b5deeed50
* [Events] Add EventPriority enum React DOM's DispatchConfig for synthetic events has an `isDiscrete` field that affects how updates triggered by an event are scheduled. Events are either discrete or continuous. This commit adds an additional type of configuration where an event has user-blocking priority, but is not discrete. E.g. updates triggered by hover are more important than the default, but they don't need to be processed serially. Because there are now three types of event priority instead of two, I've replaced the `isDiscrete` boolean with an enum: `eventPriority`. This commit implements the new enum value but does not change any behavior. I'll enable it behind a feature flag in the next commit. I've only implemented this in the legacy event system. I'll leave Flare for a follow-up. * enableUserBlockingEvents feature flag Adds a feature flag to increase the priority of events like `mouseover`, without making them discrete.