convert_git: avoid returning two entries for the same file in getchanges
This could happen in merge changesets if the merged file was different
from both parents.
assuming destination git-repo-hg
initializing destination git-repo-hg repository
scanning source...
sorting...
converting...
3 t1
2 t2.1
1 t2.2
0 Merge branch other
changeset: 3:f0873470732d
tag: tip
parent: 1:cb991dbbb06b
parent: 2:600bef931ca4
user: test <test@example.org>
date: Mon Jan 01 00:00:13 2007 +0000
files: a
description:
Merge branch other
committer: test <test@example.org>