private bool AttemptSimpleTransfer(IDragDestination <T> destination)
        {
            var draggingItem      = source.GetItem();
            var draggingNumber    = source.GetNumber();
            var draggingModifiers = source.GetSourceModifiers();

            var acceptable = destination.MaxAcceptable(draggingItem);
            var toTransfer = Mathf.Min(acceptable, draggingNumber);

            if (toTransfer > 0)
            {
                source.RemoveItems(toTransfer);
                destination.AddItems(draggingItem, toTransfer, draggingModifiers);
                return(false);
            }

            return(true);
        }