Method downset

backend/tests/git/search.rs:121–123

(&self, path: &TopicPath)

        }

        fn downset(&self, path: &TopicPath) -> HashSet<ExternalId> {
            self.0.downset(path).collect::<HashSet<ExternalId>>()
        }
    }

    fn count(kind: Kind, matches: &BTreeSet<SearchMatch>) -> usize {