Junio C Hamano <[email protected]> writes:

> My undertanding of what _should_ happen in the world order as
> currently defined (not necessarily implemented) is:
>
>  * "git add -- A B" must work the same way as "git add -- B A" and
>    "git add -- A; git add -- B"
>
>  * "git add -- path/to/subdir/file", when any of path/, path/to/,
>    path/to/subdir/ is a Git repository that is different from the
>    current Git repository, must fail.
>
> IOW, if 'path' is a repository (whether it is known as a submodule
> to the repository whose working tree contains it, or it is an
> untracked directory from the containing repository's point of view),
> the index of the containing repository cannot get path/$anything in
> it.  If you managed to do so, you found a bug [*1*].
>
> path/.git/index can of course have "to/subdir/file" in it, and from
> that point of view, "git -C path/to/subdir add file" may one day
> become an improved world order.  It is just we haven't discussed
> that possibility or reached concensus that it is a good idea.

A cursory bisection suggests that this used to work up to at least
v2.7.4; this must be a recent regression.
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