Fix template train build window not being refreshed for variants changes

src/autoreplace_gui.cpp

@@ -630,6 +630,7 @@ public:
 
 						InvalidateWindowData(WC_REPLACE_VEHICLE, (VehicleType)this->window_number, 0); // Update the autoreplace window
 						InvalidateWindowClassesData(WC_BUILD_VEHICLE); // The build windows needs updating as well
+						InvalidateWindowClassesData(WC_BUILD_VIRTUAL_TRAIN);
 						return;
 					}
 					if ((item.flags & EngineDisplayFlags::Shaded) == EngineDisplayFlags::None) e = item.engine_id;

src/build_vehicle_gui.cpp

@@ -1807,6 +1807,7 @@ struct BuildVehicleWindow : BuildVehicleWindowBase {
 
 						InvalidateWindowData(WC_REPLACE_VEHICLE, this->vehicle_type, 0); // Update the autoreplace window
 						InvalidateWindowClassesData(WC_BUILD_VEHICLE); // The build windows needs updating as well
+						InvalidateWindowClassesData(WC_BUILD_VIRTUAL_TRAIN);
 						return;
 					}
 					if ((item.flags & EngineDisplayFlags::Shaded) == EngineDisplayFlags::None) e = item.engine_id;
@@ -1865,6 +1866,7 @@ struct BuildVehicleWindow : BuildVehicleWindowBase {
 					if (refresh) {
 						InvalidateWindowData(WC_REPLACE_VEHICLE, this->vehicle_type, 0); // Update the autoreplace window
 						InvalidateWindowClassesData(WC_BUILD_VEHICLE); // The build windows needs updating as well
+						InvalidateWindowClassesData(WC_BUILD_VIRTUAL_TRAIN);
 						return;
 					}
 				}
@@ -2563,6 +2565,7 @@ struct BuildVehicleWindowTrainAdvanced final : BuildVehicleWindowBase {
 			if (refresh) {
 				InvalidateWindowData(WC_REPLACE_VEHICLE, this->vehicle_type, 0); // Update the autoreplace window
 				InvalidateWindowClassesData(WC_BUILD_VEHICLE); // The build windows needs updating as well
+				InvalidateWindowClassesData(WC_BUILD_VIRTUAL_TRAIN);
 				return;
 			}
 		}
@@ -2584,6 +2587,7 @@ struct BuildVehicleWindowTrainAdvanced final : BuildVehicleWindowBase {
 
 				InvalidateWindowData(WC_REPLACE_VEHICLE, this->vehicle_type, 0); // Update the autoreplace window
 				InvalidateWindowClassesData(WC_BUILD_VEHICLE); // The build windows needs updating as well
+				InvalidateWindowClassesData(WC_BUILD_VIRTUAL_TRAIN);
 				return true;
 			}
 			if ((item.flags & EngineDisplayFlags::Shaded) == EngineDisplayFlags::None) e = item.engine_id;

src/engine.cpp

@@ -1202,6 +1202,7 @@ void EnginesMonthlyLoop()
 
 		if (refresh) {
 			SetWindowClassesDirty(WC_BUILD_VEHICLE);
+			SetWindowClassesDirty(WC_BUILD_VIRTUAL_TRAIN);
 			SetWindowClassesDirty(WC_REPLACE_VEHICLE);
 		}
 	}