[BUG] Update the scrollbar position when the length of items grows

Hi, thanks for the great job.
There is a feature is missing, tho. I'm using the plugin to scroll through a list of element that is loaded using a page logic, 25 items per page, loaded more every time you reach the bottom.

Your scrollbar doesn't update the position so basically when the number of elements grows, it still stays on the bottom and no padding is added on the bottom.