Does anybody have an idea how the height of the scrollbar of the devRant app is determined? It changes while scrolling, and I have not figured out yet why.

It'll come to you.

It unloads the rants not in focus.

Continuing the explanation by gitlog: ..., therefore android does not know the height of the content you scrolled through so far and estimates it based on the currently displayed items.
Following that: many big rants on screen => you must've scrolled a lot of distance => small scroll bar

@gitlog @succcubbus Wow, thank you!
I asked this about a year ago but never got an answer...