Fixes issues with support powers and adds property to all IOrderGenerator classes to determine priority over selection in the left-click order scheme.

OpenRA.Mods.Common/Orders/DeployOrderTargeter.cs

@@ -32,6 +32,7 @@ namespace OpenRA.Mods.Common.Orders
 
 		public string OrderID { get; private set; }
 		public int OrderPriority { get; private set; }
+		public bool OverrideSelection { get { return true; } }
 
 		public bool CanTarget(Actor self, Target target, List<Actor> othersAtTarget, TargetModifiers modifiers, ref string cursor)
 		{

OpenRA.Mods.Common/Orders/PlaceBuildingOrderGenerator.cs

@@ -34,6 +34,10 @@ namespace OpenRA.Mods.Common.Orders
 			producer = queue.Actor;
 			building = name;
 
+			// Clear selection if using Left-Click Orders
+			if (Game.Settings.Game.UseClassicMouseStyle)
+				producer.World.Selection.Clear();
+
 			var map = producer.World.Map;
 			var tileset = producer.World.TileSet.Id.ToLowerInvariant();
 			buildingInfo = map.Rules.Actors[building].Traits.Get<BuildingInfo>();

OpenRA.Mods.Common/Orders/UnitOrderTargeter.cs

@@ -31,6 +31,7 @@ namespace OpenRA.Mods.Common.Orders
 		public string OrderID { get; private set; }
 		public int OrderPriority { get; private set; }
 		public bool? ForceAttack = null;
+		public bool OverrideSelection { get { return true; } }
 
 		public abstract bool CanTargetActor(Actor self, Actor target, TargetModifiers modifiers, ref string cursor);
 		public abstract bool CanTargetFrozenActor(Actor self, FrozenActor target, TargetModifiers modifiers, ref string cursor);