git: Keep trailing slash when checking if directory is gitignored (#6232)

* Keep trailing slash when checking if directory is gitignored

* Calling is_ignored with correct type (could be Path-like)

* Fix test to comply to annotated types

* Fix separator issues

* Relaxed typing in is_ignored

* Added test

* Test scm

* Fix test on Windows

* Expanded test_ignored_dir_unignored_subdirs

* Even more assertions

dvc/scm/git/backend/gitpython.py

@@ -3,7 +3,16 @@ import locale
 import logging
 import os
 from functools import partial
-from typing import Callable, Iterable, List, Mapping, Optional, Tuple, Union
+from typing import (
+    TYPE_CHECKING,
+    Callable,
+    Iterable,
+    List,
+    Mapping,
+    Optional,
+    Tuple,
+    Union,
+)
 
 from funcy import ignore
 
@@ -14,6 +23,9 @@ from dvc.utils import fix_env, is_binary, relpath
 from ..objects import GitCommit, GitObject
 from .base import BaseGitBackend
 
+if TYPE_CHECKING:
+    from dvc.types import StrPath
+
 logger = logging.getLogger(__name__)
 
 
@@ -111,11 +123,11 @@ class GitPythonBackend(BaseGitBackend):  # pylint:disable=abstract-method
     def git(self):
         return self.repo.git
 
-    def is_ignored(self, path: str) -> bool:
+    def is_ignored(self, path: "StrPath") -> bool:
         from git.exc import GitCommandError
 
         func = ignore(GitCommandError)(self.repo.git.check_ignore)
-        return bool(func(path))
+        return bool(func(str(path)))
 
     @property
     def root_dir(self) -> str: