Problem
When looking at a class with lot's off changes, it's sometimes hard to remember the class name of the class I'm looking at.
In the case I want to lookup the class in my code from arc patch for some reason to dive deeper into whats going on, I have to scroll all the way the top to see the class name. When getting there, I lost my focus on the piece of code I wanted to look at.

Solution
Keep the Name of the class I'm currently looking at as a steady header in the browser view above the diff, until I scroll into another class. Similar like the header bar that indicates the letter of an alphabet when scrolling down the address book or any other category in large mobile scroll views.