Click the last commit in the revision graph.

When we select a revision in the graph, we see all of the comments for that cset in the lower window. We can see the overall changeset comment we entered as well as the per-file comments for each file in the cset. Here we can see the new foo.c file we added and its comment as well as the recovery.c file we changed and what our comment on that was. The comments tell us what was changed at a glance, but what if we want to see what was actually changed in the code?