add INotifyOtherCaptured, for reacting to other units changing ownership

OpenRA.Game/Traits/TraitsInterfaces.cs

@@ -61,6 +61,7 @@ namespace OpenRA.Traits
 	public interface INotifyBuildComplete { void BuildingComplete(Actor self); }
 	public interface INotifyProduction { void UnitProduced(Actor self, Actor other, int2 exit); }
 	public interface INotifyCapture { void OnCapture(Actor self, Actor captor, Player oldOwner, Player newOwner); }
+	public interface INotifyOtherCaptured { void OnActorCaptured(Actor self, Actor captured, Actor captor, Player oldOwner, Player newOwner); }
 	public interface IAcceptSpy { void OnInfiltrate(Actor self, Actor spy); }
 	public interface IStoreOre { int Capacity { get; }}
 

OpenRA.Mods.RA/Activities/CaptureBuilding.cs

@@ -41,6 +41,9 @@ namespace OpenRA.Mods.RA.Activities
 				foreach (var t in target.TraitsImplementing<INotifyCapture>())
 					t.OnCapture(target, self, oldOwner, self.Owner);
 
+				foreach (var t in self.World.Queries.WithTrait<INotifyOtherCaptured>())
+					t.Trait.OnActorCaptured(t.Actor, target, self, oldOwner, self.Owner);
+
 				self.Destroy();
 			});
 			return this;