fixed order canceling

OpenRa.Game/MoveOrder.cs

@@ -31,6 +31,7 @@ namespace OpenRa.Game
 			if (Game.LocalPlayer == Unit.Owner)
 				Game.PlaySound("ackno.r00", false);
 			var mobile = Unit.traits.Get<Traits.Mobile>();
+			mobile.Cancel(Unit);
 			mobile.QueueAction( new Traits.Mobile.MoveTo( Destination ) );
 		}
 	}

OpenRa.Game/Traits/Mobile.cs

@@ -57,6 +57,11 @@ namespace OpenRa.Game.Traits
 			return null;
 		}
 
+		public void Cancel(Actor self)
+		{
+			if (currentAction != null)
+				currentAction.Cancel(self, this);
+		}
 	
 		public interface CurrentAction
 		{