tests/test-debugindexdot.out

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.

created new head
digraph G {
	-1 -> 0
	0 -> 1
	0 -> 2
	2 -> 3
	1 -> 3
}