"Embedded courseindex" broken

[PhMemmel]

If you choose to use the "embedded courseindex" as tab view mode and leave the edit mode (in case you were using it), the course will be unusable, because of a scroll issue:

As soon as you try to scroll the scroll handler of the courseindex will try to scroll the page to focus the currently selected element/section. In the embedded mode the course index however will not be sticky on the page (as it is intended), so this leads to the fact that you cannot scroll in the course at all.