fetch: do not count inactive branches when inferring a merge
The fetch extension would erroneously consider inactive branches when
inferring which branches to merge. It now considers only active
branches.
Ancestors of 54 2 0 Ancestors of 6 and 53 4 2 1 0 Ancestors of 5 and 44 2 0 Descendants of 57 8 Descendants of 5 and 36 7 8 Descendants of 5 and 45 7 8