Don't leak info about resources under shroud

OpenRA.Mods.RA/Harvester.cs

@@ -100,8 +100,11 @@ namespace OpenRA.Mods.RA
 
 		public Order IssueOrder(Actor self, int2 xy, MouseInput mi, Actor underCursor)
 		{
-			if (mi.Button == MouseButton.Left) return null;
-
+			if (mi.Button == MouseButton.Left) return null;
+			
+			// Don't leak info about resources under the shroud
+			if (!self.World.LocalPlayer.Shroud.IsExplored(xy)) return null;
+			
 			if (underCursor != null
 				&& underCursor.Owner == self.Owner
 				&& underCursor.HasTrait<IAcceptOre>())