Fix: Don't restore backed up vehicle name if it's no longer unique. (#10979)

src/order_backup.cpp

@@ -18,6 +18,7 @@
 #include "station_map.h"
 #include "order_cmd.h"
 #include "group_cmd.h"
+#include "vehicle_func.h"
 
 #include "safeguards.h"
 
@@ -83,6 +84,9 @@ void OrderBackup::DoRestore(Vehicle *v)
 		InvalidateWindowClassesData(WC_STATION_LIST, 0);
 	}
 
+	/* Remove backed up name if it's no longer unique. */
+	if (!IsUniqueVehicleName(this->name)) this->name.clear();
+
 	v->CopyConsistPropertiesFrom(this);
 
 	/* Make sure orders are in range */