fix: assure that worktree-roots are never considered ignored (#1458).

If they were, they would more easily be deleted by tooling like `gix clean`.

Author: Byron

gix-dir/src/walk/classify.rs

@@ -169,6 +169,7 @@ pub fn path(
                         .map(|platform| platform.excluded_kind())
                 })
                 .map_err(Error::ExcludesAccess)?
+                .filter(|_| filename_start_idx > 0)
             {
                 out.status = entry::Status::Ignored(excluded);
             }
@@ -256,6 +257,7 @@ pub fn path(
     if let Some(excluded) = ctx
         .excludes
         .as_mut()
+        .filter(|_| !rela_path.is_empty())
         .map_or(Ok(None), |stack| {
             stack
                 .at_entry(rela_path.as_bstr(), is_dir, ctx.objects)

gix-dir/tests/walk/mod.rs

@@ -4285,15 +4285,21 @@ fn top_level_slash_with_negations() -> crate::Result {
         assert_eq!(
             out,
             walk::Outcome {
-                read_dir_calls: 0,
+                read_dir_calls: 2,
                 returned_entries: entries.len(),
-                seen_entries: 1,
+                seen_entries: 5,
             }
         );
         assert_eq!(
             entries,
-            &[entry("", Ignored(Expendable), Directory)],
-            "This is wrong - the root can never be listed"
+            &[
+                entry_nokind(".git", Pruned).with_property(DotGit).with_match(Always),
+                entry(".github/workflow.yml", Tracked, File),
+                entry(".gitignore", Tracked, File),
+                entry("file", Untracked, File),
+                entry("readme.md", Tracked, File),
+            ],
+            "the top-level is never considered ignored"
         );
 
         let ((out, _root), entries) = collect(&root, None, |keep, ctx| {
@@ -4319,14 +4325,10 @@ fn top_level_slash_with_negations() -> crate::Result {
         assert_eq!(
             entries,
             &[
-                entry_nokind(".git", Ignored(Expendable))
-                    .with_property(DotGit)
-                    .with_match(Always),
-                entry("file", Ignored(Expendable), File)
+                entry_nokind(".git", Pruned).with_property(DotGit).with_match(Always),
+                entry("file", Untracked, File)
             ],
-            "This is still wrong, but consistent within what it should do.\
-            Top-level `.git` should always be Pruned, even if ignored.\
-            Except for `file` which should be untracked."
+            "And the negated file is correctly detected as untracked"
         );
     }
     Ok(())