[difflens]

Interesting execution. I'm not totally sold that Sapling is somehow forcing smaller/(more understandable) commits. Running Sapling restack with the manual step of an `amend` doesn't sound too different than running `git rebase -i` and moving the commits around. ReviewStack is interesting, but nothing new. It seems like it's removing the need to click through the commits page in GH by exposing it in a dropdown. IMO, the real improvement to our workflows will come from using better diff tools to make reviews more intuitive. I am biased of course :) (full disclosure: I work on DiffLens https://marketplace.visualstudio.com/items?itemName=DiffLens... )