Re: t5403.1 and adding a file that belongs to a submodule

git init
mkdir foo
(cd foo; git init; touch abc; git add abc; git ci -m1)
git add foo/abc
Note that doing "touch abc; git add abc foo/abc" instead will only add "abc".

I think you mean s/ci/commit/, but it is an (perhaps lower priority) bug
in "git add". Good that you spotted it.