I just tried using a different repo as a staging area (as suggested in the User Guide), and now my CircleCI builds are linked to the wrong repo (ci-staging-area instead of material-motion-js).

I did read that: I thought I'd stated a root problem.

Related issue on Travis's GitHub:

I use the same workflow. Manually running arc diff ${ other diff's commit } is a bit painful, looking up the other diff's HEAD commit and being super careful to pick the right SHA.

We just edited this ticket's information to test if we could indeed edit someone else's diff (don't worry - we changed it back).

I promise I did read Contributing Requests before I posted this. 😀

You've clearly used Phabricator a lot more than I have, but isn't it harder to follow those conversations when 3 of them are interleaved on a single timeline?

There are (at least) two axes, time and topic. Line comments can be viewed on either. Generic comments can only be viewed by time, which makes them harder to read.

It still seems weird that line comments are threaded but ticket comments aren't.