Rebased commit tracking
To make it easier to review rebased PRs commit-by-commit, Reviewable will now attempt to match up rebased commits with their older counterparts. This will affect the revision pairs it diffs for you by default, and also displayed as a miniature graph above the file matrix:
The graph can get pretty tricky (and unreadable!) if you're doing complex fixups or squashes, but should remain straightforward in the common case of a non-interactive rebase onto the target branch. If you're combining commits in your reviews you likely won't see a graph at all, since rebased commits will automatically be squashed into a single revision.
Note that the commit matching is based simply on commit messages, so any edits will break it. I'm sure there's lots of other ways to break the algorithm and the mini graph too, so please open an issue if you run into trouble, and ideally include a screenshot of the graph (like above) and a pointer to the PR. Thanks!