Xcode Version Editor - How to navigate through the changes?

Question

In the built-in version editor view of Xcode 4 and 5, when it shows the differences between two revisions, how do you jump from one changes to another?

I\'m looking for

Answer 1

Thuggish Nuggets' answer is correct. To state it clearly, if you are in the Version Editor already:

Just click on the blue area in the middle gutter between the left and right sides. It will become "selected" (blue selection lines will appear top and bottom). Don't click on the little numbered button, but in the space around it.

Then you can arrow up and down (no command keys).

Not the most obvious thing... and not documented.