6 files changed, 41 insertions, 24 deletions

diff --git a/src/depot.cpp b/src/depot.cpp
index f5c134b4b..f53a51ff0 100644
--- a/src/depot.cpp
+++ b/src/depot.cpp
@@ -11,6 +11,7 @@
 
 #include "stdafx.h"
 #include "depot_base.h"
+#include "order_backup.h"
 #include "order_func.h"
 #include "window_func.h"
 #include "core/pool_func.hpp"
@@ -31,6 +32,7 @@ Depot::~Depot()
 
 	/* Delete the depot-window */
 	DeleteWindowById(WC_VEHICLE_DEPOT, this->xy);
+	OrderBackup::Reset(this->xy);
 
 	/* Delete the depot list */
 	WindowNumber wno = (this->index << 16) | VLW_DEPOT_LIST | GetTileOwner(this->xy);
diff --git a/src/depot_gui.cpp b/src/depot_gui.cpp
index ff976fe77..e9ba9143f 100644
--- a/src/depot_gui.cpp
+++ b/src/depot_gui.cpp
@@ -261,6 +261,7 @@ struct DepotWindow : Window {
 	~DepotWindow()
 	{
 		DeleteWindowById(WC_BUILD_VEHICLE, this->window_number);
+		OrderBackup::Reset(this->window_number);
 	}
 
 	/**
@@ -978,12 +979,9 @@ struct DepotWindow : Window {
 
 				bool is_engine = (v->type != VEH_TRAIN || Train::From(v)->IsFrontEngine());
 
-				if (is_engine) {
-					OrderBackup::Reset();
-					new OrderBackup(v);
-				}
+				if (is_engine) OrderBackup::Backup(v);
 
-				if (!DoCommandP(v->tile, v->index | sell_cmd << 16, 0, GetCmdSellVeh(v->type)) && is_engine) OrderBackup::Reset();
+				if (!DoCommandP(v->tile, v->index | sell_cmd << 16, 0, GetCmdSellVeh(v->type)) && is_engine) OrderBackup::Reset(this->window_number);
 				break;
 			}
 
diff --git a/src/order_backup.cpp b/src/order_backup.cpp
index ccbe93abe..1518b2bde 100644
--- a/src/order_backup.cpp
+++ b/src/order_backup.cpp
@@ -61,7 +61,7 @@ OrderBackup::OrderBackup(const Vehicle *v)
 	}
 }
 
-void OrderBackup::RestoreTo(const Vehicle *v)
+void OrderBackup::DoRestore(const Vehicle *v)
 {
 	/* If we have a custom name, process that */
 	if (this->name != NULL) DoCommandP(0, v->index, 0, CMD_RENAME_VEHICLE, NULL, this->name);
@@ -109,22 +109,31 @@ void OrderBackup::RestoreTo(const Vehicle *v)
 
 	/* Restore vehicle group */
 	DoCommandP(0, this->group, v->index, CMD_ADD_VEHICLE_GROUP);
+}
 
-	delete this;
+/* static */ void OrderBackup::Backup(const Vehicle *v)
+{
+	OrderBackup::Reset();
+	new OrderBackup(v);
 }
 
-/* static */ OrderBackup *OrderBackup::GetByTile(TileIndex t)
+/* static */ void OrderBackup::Restore(const Vehicle *v)
 {
 	OrderBackup *ob;
 	FOR_ALL_ORDER_BACKUPS(ob) {
-		if (ob->tile == t) return ob;
+		if (v->tile != ob->tile) continue;
+
+		ob->DoRestore(v);
+		delete ob;
 	}
-	return NULL;
 }
 
-/* static */ void OrderBackup::Reset()
+/* static */ void OrderBackup::Reset(TileIndex t)
 {
-	_order_backup_pool.CleanPool();
+	OrderBackup *ob;
+	FOR_ALL_ORDER_BACKUPS(ob) {
+		if (t == INVALID_TILE || t == ob->tile) delete ob;
+	}
 }
 
 /* static */ void OrderBackup::ClearGroup(GroupID group)
diff --git a/src/order_backup.h b/src/order_backup.h
index 04913c2ac..3d4f81f92 100644
--- a/src/order_backup.h
+++ b/src/order_backup.h
@@ -43,34 +43,41 @@ private:
 	VehicleOrderID orderindex; ///< The order-index the vehicle had.
 	Order *orders;             ///< The actual orders if the vehicle was not a clone.
 
-public:
 	/**
 	 * Create an order backup for the given vehicle.
 	 * @param v The vehicle to make a backup of.
 	 */
 	OrderBackup(const Vehicle *v);
 
+	/**
+	 * Restore the data of this order to the given vehicle.
+	 * @param v The vehicle to restore to.
+	 */
+	void DoRestore(const Vehicle *v);
+
+public:
 	/** Free everything that is allocated. */
 	~OrderBackup();
 
 	/**
-	 * Restore the data of this order to the given vehicle.
-	 * @param v The vehicle to restore to.
-	 * @note After restoration the backup will automatically be removed.
+	 * Create an order backup for the given vehicle.
+	 * @param v The vehicle to make a backup of.
+	 * @note Will automatically remove any previous backups of this user.
 	 */
-	void RestoreTo(const Vehicle *v);
+	static void Backup(const Vehicle *v);
 
 	/**
-	 * Get the order backup associated with a given tile.
-	 * @param t The tile to get the order backup for.
-	 * @return The order backup, or NULL if it doesn't exist.
+	 * Restore the data of this order to the given vehicle.
+	 * @param v The vehicle to restore to.
+	 * @note After restoration the backup will automatically be removed.
 	 */
-	static OrderBackup *GetByTile(TileIndex t);
+	static void Restore(const Vehicle *v);
 
 	/**
 	 * Reset the OrderBackups.
+	 * @param tile The tile of the order backup.
 	 */
-	static void Reset();
+	static void Reset(TileIndex tile = INVALID_TILE);
 
 	/**
 	 * Clear the group of all backups having this group ID.
diff --git a/src/station_cmd.cpp b/src/station_cmd.cpp
index 77d8619d2..aa77f2327 100644
--- a/src/station_cmd.cpp
+++ b/src/station_cmd.cpp
@@ -49,6 +49,7 @@
 #include "newgrf.h"
 #include "table/airporttile_ids.h"
 #include "newgrf_airporttiles.h"
+#include "order_backup.h"
 
 #include "table/strings.h"
 
@@ -2287,6 +2288,7 @@ static CommandCost RemoveAirport(TileIndex tile, DoCommandFlag flags)
 		cost.AddCost(_price[PR_CLEAR_STATION_AIRPORT]);
 
 		if (flags & DC_EXEC) {
+			if (IsHangarTile(tile_cur)) OrderBackup::Reset(tile_cur);
 			DeleteAnimatedTile(tile_cur);
 			DoClearSquare(tile_cur);
 			DeleteNewGRFInspectWindow(GSF_AIRPORTTILES, tile_cur);
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
index 7d62184aa..a38a91492 100644
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -2373,7 +2373,6 @@ void CcBuildPrimaryVehicle(const CommandCost &result, TileIndex tile, uint32 p1,
 	if (result.Failed()) return;
 
 	const Vehicle *v = Vehicle::Get(_new_vehicle_id);
-	OrderBackup *ob = OrderBackup::GetByTile(v->tile);
-	if (ob != NULL) ob->RestoreTo(v);
+	OrderBackup::Restore(v);
 	ShowVehicleViewWindow(v);
 }