public int MoveWindow(IEnumerable <T> nextItems)
        {
            ItemsRemoved.DequeueAll();
            ItemsInside.EnqueueAll(ItemsInserted.DequeueAll());

            StrongBox <int> amount = new StrongBox <int>(0);

            nextItems.ForEach(newItem =>
            {
                ItemsInserted.Enqueue(newItem);
                ItemsRemoved.Enqueue(ItemsInside.Dequeue());
                amount.Value++;
            });
            return(amount.Value);
        }
 public Vector CountVector()
 => ItemsInside.CountVector() + ItemsInserted.CountVector();