default branch for login detection is `master`
We should support more values, like
main and possibly
trunk, or make this configurable (globally or per login)
@6543 preference wrt to hardcoding vs config options (if config, per login or across all logins)?
it's simple enough to put in 0.8.0, and may break workflows for people that were eager with migrating away from
Deleting a branch is permanent. It CANNOT be undone. Continue?