fix: make repositories with worktree config work.

gix-discover/tests/fixtures/make_basic_repo.sh

@@ -70,3 +70,15 @@ git init non-bare-without-index
   git commit -m "init"
   rm .git/index
 )
+
+git --git-dir=repo-with-worktree-in-config-unborn-no-worktreedir --work-tree=does-not-exist-yet init
+worktree=repo-with-worktree-in-config-unborn-worktree
+git --git-dir=repo-with-worktree-in-config-unborn --work-tree=$worktree init && mkdir $worktree
+
+worktree=repo-with-worktree-in-config-worktree
+git --git-dir=repo-with-worktree-in-config --work-tree=$worktree init
+mkdir $worktree && touch $worktree/file
+(cd repo-with-worktree-in-config
+  git add file
+  git commit -m "make sure na index exists"
+)

gix-discover/tests/is_git/mod.rs

@@ -85,3 +85,29 @@ fn missing_configuration_file_is_not_a_dealbreaker_in_nonbare_repo() -> crate::R
     }
     Ok(())
 }
+
+#[test]
+fn unborn_with_split_worktree_by_configuration() -> crate::Result {
+    for name in [
+        "repo-with-worktree-in-config-unborn",
+        "repo-with-worktree-in-config-unborn-no-worktreedir",
+    ] {
+        let repo = repo_path()?.join(name);
+        let kind = gix_discover::is_git(&repo)?;
+        assert_eq!(
+            kind,
+            gix_discover::repository::Kind::Bare,
+            "{name}: we think these are bare as we don't read the configuration in this case - \
+            a shortcoming to favor performance which still comes out correct in `gix`"
+        );
+    }
+    Ok(())
+}
+
+#[test]
+fn split_worktree_as_seen_from_repo() -> crate::Result {
+    let repo = repo_path()?.join("repo-with-worktree-in-config");
+    let kind = gix_discover::is_git(&repo)?;
+    assert_eq!(kind, gix_discover::repository::Kind::WorkTree { linked_git_dir: None });
+    Ok(())
+}