Method downset

backend/src/git/client.rs:159–165

(&self, topic_path: &TopicPath)

    }

    pub fn downset(&self, topic_path: &TopicPath) -> DownsetIter<'_> {
        DownsetIter::new(
            self,
            topic_path.repo_id,
            self.fetch_topic(topic_path.repo_id, &topic_path.topic_id),
        )
    }

    pub fn exists(&self, repo_id: RepoId, id: &ExternalId) -> Result<bool> {
        if !self.viewer.can_read(repo_id) {