Incorrect work_dir for worktrees of submodules

[davidkna]

Current behavior 😯

The work_dir for worktrees of submodules is resolved to .git/modules/.... instead of the git-worktree directory.
For the example the discovered work_dir is .git/modules/temp-submod. I think the issue stems from somewhere in open_from_paths.

Reported via starship/starship#6417

Expected behavior 🤔

Discovered work_dir is temp-wt directory

Git behavior

Matches expected behavior

Steps to reproduce 🕹

git init
touch Readme.md
git commit -m "c"

git submodule add https://github.com/GitoxideLabs/gitoxide temp-submod
cd temp-submod
git worktree add ../../temp-wt
cd ../../temp-wt
# discover
# Repository { kind: Submodule, git_dir: "base-repo/.git/modules/temp-submod/worktrees/temp-wt", work_dir: Some("base-repo/.git/modules/temp-submod") }

[Byron]

Thanks a lot for reporting and for helping to reproduce the issue - fixing it that way was a breeze!

Unfortunately the fix will have to wait until the 22nd of January for when the next major release is scheduled. A patch release is already impossible due to breaking changes in at least one plumbing crate, unfortunately.