Provide appropriate upgrade rule.

OpenRA.Mods.Common/UpdateRules/Rules/RemoveCanUndeployFromGrantConditionOnDeploy.cs

@@ -0,0 +1,48 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2018 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+
+namespace OpenRA.Mods.Common.UpdateRules.Rules
+{
+	public class RemoveCanUndeployFromGrantConditionOnDeploy : UpdateRule
+	{
+		public override string Name { get { return "Remove CanUndeploy from GrantConditionOnDeploy."; } }
+		public override string Description
+		{
+			get
+			{
+				return "The CanUndeploy property was removed from the GrantConditionOnDeploy trait.\n" +
+					"Pausing the trait itself achieves the same effect now.";
+			}
+		}
+
+		public override IEnumerable<string> UpdateActorNode(ModData modData, MiniYamlNode actorNode)
+		{
+			foreach (var gcod in actorNode.ChildrenMatching("GrantConditionOnDeploy"))
+			{
+				var canUndeploy = gcod.LastChildMatching("CanUndeploy");
+				if (canUndeploy == null)
+					continue;
+
+				gcod.RemoveNode(canUndeploy);
+
+				if (canUndeploy.NodeValue<bool>())
+					continue;
+
+				var deployedCondition = gcod.LastChildMatching("DeployedCondition");
+				gcod.AddNode("PauseOnCondition", deployedCondition.Value.Value);
+			}
+
+			yield break;
+		}
+	}
+}

OpenRA.Mods.Common/UpdateRules/UpdatePath.cs

@@ -82,6 +82,7 @@ namespace OpenRA.Mods.Common.UpdateRules
 				new SplitRepairDecoration(),
 				new MoveHackyAISupportPowerDecisions(),
 				new DefineGroundCorpseDefault(),
+				new RemoveCanUndeployFromGrantConditionOnDeploy(),
 			})
 		};