Page tree does not auto-scroll to current page

If there is a lot of pages in a certain instance, and the user views a page with a title that is rather low alphabetically, for example something starting with 'Z', the page tree on the left of the page does not auto-scroll to the current viewed page.

Instead, the page tree scroll bar stays at the top of the page tree. Thus, the user will have to manually scroll the scroll bar to where the page is located in the page tree.