Called when the player flips an entity. This event is only fired when the entity actually changes its orientation or mirroring, so it won't be triggered when pressing the flip keys on an entity that can't be flipped.
This event reflects a change in the LuaEntity::mirroring property.
entity: LuaEntity — The flipped entity.horizontal: boolean — The enacted flip. true means a horizontal flip, false a vertical one.player_index: uint32name: defines.events — Identifier of the eventtick: uint32 — Tick the event was generated.