Dynamic scroll height

Hello,
First thing, great work guys!

I would like to ask about the possibility of adding/making the scroll calculated dynamically depending on the number of items needed to be scrolled throw. When the list of items changes (increases or decreases), the scrollbar does not change - both its height and position.

This could also help to fix this issue that is already raised: https://github.com/fluttercommunity/flutter-draggable-scrollbar/issues/32