Rebase exec spawning looks incorrect

[drok]

When rebasing with 'exec git merge ...', sh is run with the duplicated cmd line as seen below:

TODO fragment:

exec git merge -s ours 9715f10e42

sh executed with 2 duplicated args:

  |   |           `-git,3585409 rebase --continue
  |   |               `-sh,4091723 -c git merge -s ours 9715f10e42 git merge -s ours 9715f10e42
  |   |                   `-git,4091724 merge -s ours 9715f10e42
  |   |                       `-vim,4091743 /home/radu/proj/git/.git/MERGE_MSG

$ strings /proc/4091723/cmdline
/bin/sh
git merge -s ours 9715f10e42
git merge -s ours 9715f10e42

The cmdline should not be duplicated