Once items leaving have emptied a column while the server has more, the next page takes their place; a column only shows "nothing here" when there really is nothing. Reading sends no realtime event, so this is what prune() is for.
Once items leaving have emptied a column while the server has more, the next page takes their place; a column only shows "nothing here" when there really is nothing. Reading sends no realtime event, so this is what prune() is for.