A large topic page will always have the bottom tracking button, and will also have the timeline, meaning we already had 2 tracking events.
But it gets even worse when you know that the timeline button is a component connector which will trigger `didInsertElement` very frequently, meaning we were constantly adding more and more appEvents handlers.
The streamlength/height code when true would return just after we had inserted the timeline-controls, resulting, on topic-progress event to display an empty timeline-controls when clicked.
I think this code in unecessary and we should only rely on the code in `hideProgress` which will currenly hide the progress is the stream has only one post displayed on desktop (always shown on mobile).
