I'll need to get approval to use this on that codebase. I've tried it out on a smaller open-source codebase as a first step.

For anyone interested:

  - here's the Codebuff session: https://gist.github.com/craigds/b51bbd1aa19f2725c8276c5ad36947e2
  - The result was this PR: https://github.com/koordinates/kart/pull/1011

It required a bit of back and forth to produce a relatively small change, and I think it was a bit too narrow with the files it selected (it missed updating the implementations of a method in some subclasses, since it didn't look at those files)

So I'm not sure if this saved me time, but it's nevertheless promising! I'm looking forward to what it will be capable of in 6mo.