Regression in git ls-files, or bug in completion?

Hi,

I noticed a possible regression caused by commit b9670c1f5e (dir: fix checks on common prefix directory).

What is supposed to be the output of this?

  git init
  mkdir simple-dir
  touch simple-dir/empty
  git -C simple-dir ls-files --other --directory

Before it was "empty", now it is "./".

This causes bash's completion to be botched; "git add simple-dir/" adds "simple-dir/./".

Cheers.