OnDisplayEventTrigger

@Serializable
@SerialName(value = "OnDisplay")
object OnDisplayEventTrigger : EventTrigger

Fires once, the first time the declaring tile enters composition — implemented by every built-in container/interactive tile via TileRenderingScope.OnDisplayEffect() (extensions/TileRenderingScopeExtensions.kt), keyed on the tile's own id so it doesn't re-fire on plain recomposition.