ScreenMap should TickRender, rather than just Tick.

This is as FrozenUnderFog.TickRender queues an update to the screen map. If this is not processed in the same tick, this results in screen bounds for the frozen actor being 1 tick behind. By making ScreenMap TickRender, it ensures changes from both Tick and TickRender traits are processed, rather than just Tick traits.

OpenRA.Game/Traits/World/ScreenMap.cs

@@ -245,7 +245,7 @@ namespace OpenRA.Traits
 			return rect;
 		}
 
-		public void Tick()
+		public void TickRender()
 		{
 			foreach (var a in addOrUpdateActors)
 			{

OpenRA.Game/World.cs

@@ -353,7 +353,6 @@ namespace OpenRA
 				ActorsWithTrait<ITick>().DoTimed(x => x.Trait.Tick(x.Actor), "Trait");
 
 				effects.DoTimed(e => e.Tick(this), "Effect");
-				ScreenMap.Tick();
 			}
 
 			while (frameEndActions.Count != 0)
@@ -364,6 +363,7 @@ namespace OpenRA
 		public void TickRender(WorldRenderer wr)
 		{
 			ActorsWithTrait<ITickRender>().DoTimed(x => x.Trait.TickRender(wr, x.Actor), "Render");
+			ScreenMap.TickRender();
 		}
 
 		public IEnumerable<Actor> Actors { get { return actors.Values; } }