Figure out correct (centered) text positioning inside the box
Find out why the bookmark is not shown on class members inside class
Fix bookmark node not showing on class itself, only on members
Fix bookmark node not showing on members of expanded class, only on the class itself
Fix spacing for nodes with bookmarks during layout phase - otherwise they overlap their upper neighbors
Resize bookmark node or bookmarked node to make them in sync - if bookmark is smaller it should expand, otherwise the bookmarked node should expand
Fix the positioning of the bookmark node in respect to the bookmarked node
Fix the click on the class (or other item) to be detected on bookmark node (because we still have to implement handling of the click on the bookmark node at some point)