From 0406b89a960e675f4fbe867f10af1c7185f4662a Mon Sep 17 00:00:00 2001
From: Paul Chote <pchote@users.noreply.github.com>
Date: Tue, 27 Nov 2018 22:29:06 +0000
Subject: [PATCH] Add Actor.ReplacedByActor to track transformations.

This isn't great conceptually, but has precedent
in the Generation number.
---
 OpenRA.Game/Actor.cs                       | 1 +
 OpenRA.Mods.Common/Activities/Transform.cs | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/OpenRA.Game/Actor.cs b/OpenRA.Game/Actor.cs
index f64d091aea..6667199b97 100644
--- a/OpenRA.Game/Actor.cs
+++ b/OpenRA.Game/Actor.cs
@@ -48,6 +48,7 @@ namespace OpenRA
 		public Activity CurrentActivity { get; private set; }
 
 		public int Generation;
+		public Actor ReplacedByActor;
 
 		public IEffectiveOwner EffectiveOwner { get; private set; }
 		public IOccupySpace OccupiesSpace { get; private set; }
diff --git a/OpenRA.Mods.Common/Activities/Transform.cs b/OpenRA.Mods.Common/Activities/Transform.cs
index 3c8bc77187..03ab901344 100644
--- a/OpenRA.Mods.Common/Activities/Transform.cs
+++ b/OpenRA.Mods.Common/Activities/Transform.cs
@@ -132,6 +132,8 @@ namespace OpenRA.Mods.Common.Activities
 				foreach (var nt in self.TraitsImplementing<INotifyTransform>())
 					nt.AfterTransform(a);
 
+				self.ReplacedByActor = a;
+
 				if (selected)
 					w.Selection.Add(w, a);