Matches https://github.com/ilyagr/pijul-clone as of now, might become out of sync

Fixing zombie conflicts: known was computed on the wrong thing

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.

Created by  pmeunier  on May 13, 2022
L4EZSH6BBU46PVEG2HRPKIMIX7HUXUUEX5PGYYW2I3GXWKSFZAHAC
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