git gui error with relocated repository

Hi Pat,

I'm running git 2.0.0-rc0 (haven't got round to pulling down rc1 yet)
which includes gitgui-0.19.0 and I'm getting a new error when I run
'git gui' in a repository with a .git file (created by git submodule).

I can send you a screencap of the error message off list if you want
but the text is

"No working directory ../../../<repo>

couldn't change working directory to ../../../<repo>: no such file or directory"

Here's some other info that might help

  $ git --version
  git version 2.0.0.rc0

  $ cat .git
  gitdir: ../.git/modules/<repo>

  $ git rev-parse --git-dir
  /home/chris/src/<super>/.git/modules/<repo>

  $ git config core.worktree
  ../../../<repo>

Thanks,
Chris