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Re: git commit file completion recently broke

On Wed, Dec 06, 2017 at 07:22:35PM -0500, Jeff King wrote:

> On Wed, Dec 06, 2017 at 04:01:51PM -0800, Jacob Keller wrote:
> > I think I narrowed this down to "git diff-index --name-only --relative
> > HEAD" producing a list of files *not* relative to the current
> > directory.
> Hmm, my guess would have been something funny in the setup code
> forgetting our original prefix.
> But nope, it looks like the culprit is f7923a5ece (diff: use
> skip_to_optional_val(), 2017-12-04), which switched over parsing of
> "--relative".

Oh, actually, I guess I was half-right. It feeds &options->prefix as the
"default", meaning that we overwrite it with the empty string. I don't
think "--relative" works for the semantics of skip_to_optional_value,
since it needs:

  --relative=foo: set prefix to "foo"

  --relative: leave prefix untouched