As we made --list-cmds read the local configuration file in an
earlier step, the completion.commands variable respects repo-level
configuration. Use __git which ensures that the proper repo config
is consulted if the command line contains 'git -C /some/other/repo'.
Suggested-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Todd Zullinger <tmz@pobox.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>