Thanks for the suggestion (and creative solution!).
Since I’m still only doing this in my spare time, my time is pretty limited. So when I develop a new feature, I skip as much functionality as possible. I indeed intentionally skipped adding a scrollbar. Because I thought that if that functionality is needed, someone will complain. If nobody complains then it’s good I saved the time of implementing a feature nobody needs.
But since you need it, it’s on my task list now :).