Codechange: Add VehicleOrderSaver::Restore()

src/train_cmd.cpp

@@ -2449,6 +2449,7 @@ private:
 	StationID      old_last_station_visited;
 	VehicleOrderID index;
 	bool           suppress_implicit_orders;
+	bool           restored;
 
 public:
 	VehicleOrderSaver(Train *_v) :
@@ -2457,16 +2458,29 @@ public:
 		old_dest_tile(_v->dest_tile),
 		old_last_station_visited(_v->last_station_visited),
 		index(_v->cur_real_order_index),
-		suppress_implicit_orders(HasBit(_v->gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS))
+		suppress_implicit_orders(HasBit(_v->gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS)),
+		restored(false)
 	{
 	}
 
-	~VehicleOrderSaver()
+	/**
+	 * Restore the saved order to the vehicle.
+	 */
+	void Restore()
 	{
 		this->v->current_order = this->old_order;
 		this->v->dest_tile = this->old_dest_tile;
 		this->v->last_station_visited = this->old_last_station_visited;
 		SB(this->v->gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS, 1, suppress_implicit_orders ? 1: 0);
+		this->restored = true;
+	}
+
+	/**
+	 * Restore the saved order to the vehicle, if Restore() has not already been called.
+	 */
+	~VehicleOrderSaver()
+	{
+		if (!this->restored) this->Restore();
 	}
 
 	/**