PlaceBuilding order is now handled by the player, not in UnitOrders.

OpenRa.Game/Traits/PlaceBuilding.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using OpenRa.GameRules;
+
+namespace OpenRa.Traits
+{
+	class PlaceBuildingInfo : StatelessTraitInfo<PlaceBuilding> { }
+
+	class PlaceBuilding : IResolveOrder
+	{
+		public void ResolveOrder( Actor self, Order order )
+		{
+			if( order.OrderString == "PlaceBuilding" )
+			{
+				Game.world.AddFrameEndTask( _ =>
+				{
+					var queue = self.traits.Get<ProductionQueue>();
+					var unit = Rules.ActorInfo[ order.TargetString ];
+					var producing = queue.CurrentItem(unit.Category);
+					if( producing == null || producing.Item != order.TargetString || producing.RemainingTime != 0 )
+						return;
+
+					Game.world.CreateActor( order.TargetString, order.TargetLocation - Footprint.AdjustForBuildingSize( unit.Traits.Get<BuildingInfo>() ), order.Player );
+					if (order.Player == Game.LocalPlayer)
+					{
+						Sound.Play("placbldg.aud");
+						Sound.Play("build5.aud");
+					}
+
+					queue.FinishProduction(unit.Category);
+				} );
+			}
+		}
+	}
+}