`git worktree list` reports the main worktree as the common git dir with
a trailing "/.git" removed, which equals the working tree only when the
git dir sits inside it. In a submodule, a bare repo, or a repo using
core.worktree it doesn't, so comparing the reported path against the
working tree path matches nothing: no worktree is recognized as current
or as main. Most visibly, inside a submodule lazygit claimed we were in
a linked worktree named after the submodule, and offered to remove that
"worktree".
Comparing git dirs identifies a worktree unambiguously, so use that.
A worktree whose directory is gone has no git dir to compare, and there
we still have nothing better than its path.
The submodule tests were asserting the linked-worktree suffix in the
status view; it is gone now, and the repo name still says which
submodule we're in.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>