Get (or lazily create) the scene-scoped event bus shared by every flow graph attached to scene. Sharing one bus lets graphs exchange custom events (BJS FlowGraphSceneEventCoordinator).
scene
FlowGraphSceneEventCoordinator
Get (or lazily create) the scene-scoped event bus shared by every flow graph attached to
scene. Sharing one bus lets graphs exchange custom events (BJSFlowGraphSceneEventCoordinator).