When checking known patches to detect zombie conflicts, the "known" list was computed on the neighbouring changes (when producing patches), whereas the checks were performed on the edges.
L4EZSH6BBU46PVEG2HRPKIMIX7HUXUUEX5PGYYW2I3GXWKSFZAHAC // When reintroducing a deleted flag, check whether// the re-introduction patch knows about the alive// edges around the target.
// When reintroducing an edge that was deleted,// check whether the re-introduction patch knows// about the alive edges around the target.