When an event is a visibility change event, as per MSC3531, the visibility change implied by the event.
The event id affected.
Optionally, a human-readable reason explaining why the event was hidden. Ignored if the event was made visible.
If true, the target event should be made visible. Otherwise, it should be hidden.
true
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When an event is a visibility change event, as per MSC3531, the visibility change implied by the event.