Support infinite scroll

[allenz-crypto]

During infinite scroll, you trigger a loadMore event when you scroll to the bottom which will add more items into your scroll content. However, the scrollbar remains the same size until you trigger another scroll event.

The resizeScrollbar function (used by recalculate and compute) currently recreates a new scrollbar and resets it to the top of the scroll content, but we do not need to do that to resize the scrollbar, we just have to call updateScrollbarAndSetupProperties

This will allow recalculate and compute to properly reset the size of the scrollbar when items re-render (see the example I added)