(svn r23484) -Fix [FS#4770]: in case you already have orders, ignore the vehicles when adding an extra order

src/depot_gui.cpp

@@ -838,12 +838,14 @@ struct DepotWindow : Window {
 	/**
 	 * Clones a vehicle
 	 * @param v the original vehicle to clone
+	 * @return Always true.
 	 */
-	virtual void OnVehicleSelect(const Vehicle *v)
+	virtual bool OnVehicleSelect(const Vehicle *v)
 	{
 		if (DoCommandP(this->window_number, v->index, _ctrl_pressed ? 1 : 0, CMD_CLONE_VEHICLE | CMD_MSG(STR_ERROR_CAN_T_BUY_TRAIN + v->type), CcCloneVehicle)) {
 			ResetObjectToPlace();
 		}
+		return true;
 	}
 
 	virtual void OnPlaceObjectAbort()

src/order_gui.cpp

@@ -1466,7 +1466,7 @@ public:
 		}
 	}
 
-	virtual void OnVehicleSelect(const Vehicle *v)
+	virtual bool OnVehicleSelect(const Vehicle *v)
 	{
 		/* v is vehicle getting orders. Only copy/clone orders if vehicle doesn't have any orders yet.
 		 * We disallow copying orders of other vehicles if we already have at least one order entry
@@ -1474,13 +1474,14 @@ public:
 		 * Obviously if you press CTRL on a non-empty orders vehicle you know what you are doing
 		 * TODO: give a warning message */
 		bool share_order = _ctrl_pressed || this->goto_type == OPOS_SHARE;
-		if (this->vehicle->GetNumOrders() != 0 && !share_order) return;
+		if (this->vehicle->GetNumOrders() != 0 && !share_order) return false;
 
 		if (DoCommandP(this->vehicle->tile, this->vehicle->index | (share_order ? CO_SHARE : CO_COPY) << 30, v->index,
 				share_order ? CMD_CLONE_ORDER | CMD_MSG(STR_ERROR_CAN_T_SHARE_ORDER_LIST) : CMD_CLONE_ORDER | CMD_MSG(STR_ERROR_CAN_T_COPY_ORDER_LIST))) {
 			this->selected_order = -1;
 			ResetObjectToPlace();
 		}
+		return true;
 	}
 
 	virtual void OnPlaceObjectAbort()

src/vehicle_gui.cpp

@@ -2671,8 +2671,7 @@ bool VehicleClicked(const Vehicle *v)
 	v = v->First();
 	if (!v->IsPrimaryVehicle()) return false;
 
-	_thd.GetCallbackWnd()->OnVehicleSelect(v);
-	return true;
+	return _thd.GetCallbackWnd()->OnVehicleSelect(v);
 }
 
 void StopGlobalFollowVehicle(const Vehicle *v)

src/window_gui.h

@@ -667,8 +667,9 @@ public:
 	/**
 	 * The user clicked on a vehicle while HT_VEHICLE has been set.
 	 * @param v clicked vehicle. It is guaranteed to be v->IsPrimaryVehicle() == true
+	 * @return True if the click is handled, false if it is ignored.
 	 */
-	virtual void OnVehicleSelect(const struct Vehicle *v) {}
+	virtual bool OnVehicleSelect(const struct Vehicle *v) { return false; }
 
 	/**
 	 * The user cancelled a tile highlight mode that has been set.