(Off topic) @Oliver
There is scroll-bar on right side of such long note. What about just making the scroll-bar more visible by some CSS instead of adding another feature to the screen-space?
But you have good idea to make do color portion above slider differently from portion under slider so we see the position of slider at first glance. Maybe the portion above slider can be green and the portion under slider would have color of text background to look tidy (or be red).
@tgrosinger Is it possible to enable page-preview on hover in this “history” pane as in File-Explorer?
Edit: Related feature requests: