(svn r21933) -Codechange: Split cur_order_index into cur_auto_order_index and cur_real_order_index to keep track of the current real order in an unambiguous way.

-Fix [FS#4440]: Automatic orders behave now stable wrt. service orders and are not added or removed depending on the need of servicing.
-Fix: Various other issues with automatic orders, e.g. vehicles getting stuck with "no orders" when there are automatic orders at the end of the order list.

src/saveload/afterload.cpp

@@ -2536,6 +2536,14 @@ bool AfterLoadGame()
 			 * it should have set v->z_pos correctly. */
 			assert(v->tile != TileVirtXY(v->x_pos, v->y_pos) || v->z_pos == GetSlopeZ(v->x_pos, v->y_pos));
 		}
+
+		/* Fill Vehicle::cur_real_order_index */
+		FOR_ALL_VEHICLES(v) {
+			if (!v->IsPrimaryVehicle()) continue;
+
+			v->cur_real_order_index = v->cur_auto_order_index;
+			v->UpdateRealOrderIndex();
+		}
 	}
 
 	/* Road stops is 'only' updating some caches */

src/saveload/oldloader_sl.cpp

@@ -1138,7 +1138,7 @@ static const OldChunks vehicle_chunk[] = {
 	OCL_VAR ( OC_UINT16,   1, &_old_order ),
 
 	OCL_NULL ( 1 ), ///< num_orders, now calculated
-	OCL_SVAR(  OC_UINT8, Vehicle, cur_order_index ),
+	OCL_SVAR(  OC_UINT8, Vehicle, cur_auto_order_index ),
 	OCL_SVAR(   OC_TILE, Vehicle, dest_tile ),
 	OCL_SVAR( OC_UINT16, Vehicle, load_unload_ticks ),
 	OCL_SVAR( OC_FILE_U16 | OC_VAR_U32, Vehicle, date_of_last_service ),

src/saveload/saveload.cpp

@@ -222,8 +222,9 @@
  *  155   21453
  *  156   21728
  *  157   21862
+ *  158   21933
  */
-extern const uint16 SAVEGAME_VERSION = 157; ///< Current savegame version of OpenTTD.
+extern const uint16 SAVEGAME_VERSION = 158; ///< Current savegame version of OpenTTD.
 
 SavegameType _savegame_type; ///< type of savegame we are loading
 

src/saveload/vehicle_sl.cpp

@@ -487,7 +487,8 @@ const SaveLoad *GetVehicleDescription(VehicleType vt)
 		     SLE_VAR(Vehicle, tick_counter,          SLE_UINT8),
 		 SLE_CONDVAR(Vehicle, running_ticks,         SLE_UINT8,                   88, SL_MAX_VERSION),
 
-		     SLE_VAR(Vehicle, cur_order_index,       SLE_UINT8),
+		     SLE_VAR(Vehicle, cur_auto_order_index,  SLE_UINT8),
+		 SLE_CONDVAR(Vehicle, cur_real_order_index,  SLE_UINT8,                  158, SL_MAX_VERSION),
 		/* num_orders is now part of OrderList and is not saved but counted */
 		SLE_CONDNULL(1,                                                            0, 104),