search: Use canned headBranch only when repo.Branches[0] is HEAD (!13380) · Merge requests · Warren Gifford / sourcegraph · GitLab

Warren Gifford requested to merge zoekt-indexed-repos-perf-fix into main Aug 26, 2020

Created by: efritz

See https://github.com/sourcegraph/sourcegraph/pull/13373#discussion_r477452975.