The completion for format-patch currently suggests --base=, --interdiff= and --range-diff= as options. However, with these `=` forms of the options, there is no space and we'd enter the `--*` case which means we don't call the __git_complete_revlist() at the end. Teach _git_format_patch() to complete refs in the case of --base=, --interdiff= and --range-diff=. Signed-off-by: Denton Liu <liu.denton@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>