Feature: Contextual actions for vehicles grouped by shared orders (#8425)

src/vehicle.cpp

@@ -3013,3 +3013,39 @@ 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;
+	}
+}