I have looked through the code and I think I've pin pointed the place where to make the changes. I spent lot of time looking thru the code and figuring it out. I hope I manage to add diff to this review request before sundays meeting.
Use case:

When user right-clicks line number of the code in diff viewer, pop up opens. The pop up contains the link to the code line already selected, where the user can then copy the link to that code line.