Merge tag '13.0-beta2' into jgrpp

# Conflicts:
#	src/cheat_gui.cpp
#	src/company_gui.cpp
#	src/console_gui.cpp
#	src/depot_gui.cpp
#	src/error_gui.cpp
#	src/gfx.cpp
#	src/graph_gui.cpp
#	src/group_gui.cpp
#	src/lang/english.txt
#	src/lang/korean.txt
#	src/lang/polish.txt
#	src/misc_gui.cpp
#	src/network/network_content_gui.h
#	src/newgrf_debug_gui.cpp
#	src/order_gui.cpp
#	src/rail_gui.cpp
#	src/road_gui.cpp
#	src/settings_gui.cpp
#	src/settings_type.h
#	src/station_gui.cpp
#	src/subsidy_gui.cpp
#	src/table/settings/gui_settings.ini
#	src/timetable_gui.cpp
#	src/town_gui.cpp
#	src/train_cmd.cpp
#	src/vehicle_gui.cpp
#	src/viewport.cpp
#	src/water_cmd.cpp
#	src/widgets/dropdown.cpp
#	src/window_gui.h

src/vehicle.cpp

@@ -4598,3 +4598,39 @@ uint32 Vehicle::GetDisplayMinPowerToWeight() const
 	if (max_weight == 0) return 0;
 	return GetGroundVehicleCache()->cached_power * 10u / max_weight;
 }
+
+/**
+ * Checks if two vehicle chains have the same list of engines.
+ * @param v1 First vehicle chain.
+ * @param v1 Second vehicle chain.
+ * @return True if same, false if different.
+ */
+bool VehiclesHaveSameEngineList(const Vehicle *v1, const Vehicle *v2)
+{
+	while (true) {
+		if (v1 == nullptr && v2 == nullptr) return true;
+		if (v1 == nullptr || v2 == nullptr) return false;
+		if (v1->GetEngine() != v2->GetEngine()) return false;
+		v1 = v1->GetNextVehicle();
+		v2 = v2->GetNextVehicle();
+	}
+}
+
+/**
+ * Checks if two vehicles have the same list of orders.
+ * @param v1 First vehicles.
+ * @param v1 Second vehicles.
+ * @return True if same, false if different.
+ */
+bool VehiclesHaveSameOrderList(const Vehicle *v1, const Vehicle *v2)
+{
+	const Order *o1 = v1->GetFirstOrder();
+	const Order *o2 = v2->GetFirstOrder();
+	while (true) {
+		if (o1 == nullptr && o2 == nullptr) return true;
+		if (o1 == nullptr || o2 == nullptr) return false;
+		if (!o1->Equals(*o2)) return false;
+		o1 = o1->next;
+		o2 = o2->next;
+	}
+}