Fix #9665: [Linkgraph] Fix travel times of non-direct journeys

src/saveload/afterload.cpp

@@ -3148,6 +3148,13 @@ bool AfterLoadGame()
 		}
 	}
 
+	/* Use current order time to approximate last loading time */
+	if (IsSavegameVersionBefore(SLV_LAST_LOADING_TICK)) {
+		for (Vehicle *v : Vehicle::Iterate()) {
+			v->last_loading_tick = std::max(_tick_counter, static_cast<uint64>(v->current_order_time)) - v->current_order_time;
+		}
+	}
+
 	/* Compute station catchment areas. This is needed here in case UpdateStationAcceptance is called below. */
 	Station::RecomputeCatchmentForAll();
 

src/saveload/saveload.h

@@ -341,6 +341,7 @@ enum SaveLoadVersion : uint16 {
 	SLV_DOCK_DOCKINGTILES,                  ///< 298  PR#9578 All tiles around docks may be docking tiles.
 	SLV_REPAIR_OBJECT_DOCKING_TILES,        ///< 299  PR#9594 v12.0  Fixing issue with docking tiles overlapping objects.
 	SLV_U64_TICK_COUNTER,                   ///< 300  PR#10035 Make _tick_counter 64bit to avoid wrapping.
+	SLV_LAST_LOADING_TICK,                  ///< 301  PR#9693 Store tick of last loading for vehicles.
 
 	SL_MAX_VERSION,                         ///< Highest possible saveload version
 };

src/saveload/vehicle_sl.cpp

@@ -705,6 +705,7 @@ public:
 		SLE_CONDVAR(Vehicle, group_id,              SLE_UINT16,                  SLV_60, SL_MAX_VERSION),
 
 		SLE_CONDVAR(Vehicle, current_order_time,    SLE_UINT32,                  SLV_67, SL_MAX_VERSION),
+		SLE_CONDVAR(Vehicle, last_loading_tick,     SLE_UINT64,                   SLV_LAST_LOADING_TICK, SL_MAX_VERSION),
 		SLE_CONDVAR(Vehicle, lateness_counter,      SLE_INT32,                   SLV_67, SL_MAX_VERSION),
 	};
 #if defined(_MSC_VER) && (_MSC_VER == 1915 || _MSC_VER == 1916)