Keep selection on mcv deploy/undeploy. Bonus: build tab opens on mcv deploy

OpenRA.Game/Selection.cs

@@ -18,7 +18,17 @@ namespace OpenRA
 	public class Selection
 	{
 		List<Actor> actors = new List<Actor>();
+		public void Add(World w, Actor a)
+		{
+			actors.Add(a);
+			foreach (var ns in w.WorldActor.traits.WithInterface<INotifySelection>())
+				ns.SelectionChanged();
+		}
 		
+		public bool Contains(Actor a)
+		{
+			return actors.AsEnumerable().Contains(a);
+		}
 		public void Combine(World world, IEnumerable<Actor> newSelection, bool isCombine, bool isClick)
 		{
 			var oldSelection = actors.AsEnumerable();

OpenRA.Mods.RA/Activities/TransformIntoActor.cs

@@ -9,6 +9,8 @@
 #endregion
 
 using System;
+using System.Linq;
+using System.Collections.Generic;
 using OpenRA.Traits;
 
 namespace OpenRA.Mods.RA.Activities
@@ -36,14 +38,19 @@ namespace OpenRA.Mods.RA.Activities
 		{
 			if (isCanceled) return NextActivity;
 
-			self.World.AddFrameEndTask(_ =>
+			self.World.AddFrameEndTask(w =>
 			{
+				var selected = Game.controller.selection.Contains(self);
+				
 				self.World.Remove(self);
 				foreach (var s in sounds)
 					Sound.PlayToPlayer(self.Owner, s, self.CenterLocation);
 
 				var a = self.World.CreateActor(actor, self.Location + offset, self.Owner);
 				a.Health = GetHealthToTransfer(self, a, transferPercentage);
+				
+				if (selected)
+					Game.controller.selection.Add(w, a);
 			});
 			return this;
 		}

OpenRA.Mods.RA/Activities/UndeployMcv.cs

@@ -18,13 +18,17 @@ namespace OpenRA.Mods.RA.Activities
 		public IActivity NextActivity { get; set; }
 		bool started;
 
-		void DoUndeploy(World w,Actor self)
+		void DoUndeploy(World w, Actor self)
 		{
+			var selected = Game.controller.selection.Contains(self);
 			w.Remove(self);
 			
 			var mcv = w.CreateActor("mcv", self.Location + new int2(1, 1), self.Owner);
 			mcv.Health = TransformIntoActor.GetHealthToTransfer(self, mcv, true);
 			mcv.traits.Get<Unit>().Facing = 96;
+			
+			if (selected)
+				Game.controller.selection.Add(w, mcv);
 		}
 
 		public IActivity Tick(Actor self)