Re: Gerrit, GitButler, and Jujutsu projects collaborating on change-id commit footer

> Jujutsu (and Mercurial) keep track of the set of visible heads. There
> can be branches but they are not necessary. When you rewrite a commit,
> Jutjutsu always rewrites all descendants. It also updates all branches
> pointing to those commits automatically. For example, if you update
> the description of some commit with `jj describe -m 'new description
> --revision xyz', then commit xyz and all its descendants will be
> updated, and any branches pointing to any of the rewritten commits
> will be updated.

> > and even then still not workable because Git might
> > have to search _many_ branches to find commits matching the given change
> > ID.  (Fossil could have an index on change ID and trivially make that
> > search possible, but for Git adding an index is more complicated.)
> 
> Yes, I understand that it would be significant work to add support in
> Git. I hope that Git can gain the feature eventually, but we have no
> expectation that it will be implemented soon, especially not the UX
> part (the preservation-on-rewrite part should be simpler, I think).