lab 0.23.0: `mr show -c' fails in git worktree

[github-cygwin]

Hi,

I just encountered the issue from the subject line. While
lab mr show <MR#>
works nicely in a worktree,
lab mr show -c <MR#>
fails with ERROR: config.go:364: open .git/lab/lab.toml: not a directory
The reason is apparently that .git is a file in a worktree, rather than a directory. Looks like following the gitdir info in the worktree .git file is not implemented yet?

Corinna

[bmeneg]

Hi Corinna,

We already have the code for following the gitdir, but it isn't being used where it should.
I'm going to submit a PR correcting it.