Re: [PATCH] rebase: introduce --update-branches option

Brian, thanks for looking. The only thing I can come up with to say about having lots of refs is that at least that part of this isn't brand new code. The part that collects ref info uses the same routines as `git log --decorate`. Do you recall how long that took in the repository with 80,000 refs?

Junio, thanks for eyeballing. Let me know if some style violations remain.

Taylor, thanks for coming up with a way to configure branches to be excluded. I haven't worked on implementing that yet. Let's continue to watch for feedback if people will desire this kind of control.

Using `exec git branch -f` is further discussed in the review, where there are arguments for introducing a new todo command. I'll add some comments there when I post a new patch set. But if someone's in favor of accepting a version of this without that change, with the potential harm from this feature being low enough, I'm not opposed to that either.