fix(__init__.py): edit tree release in Windows

Previously, tests about the deletion of tagtrees in GitHub's Windows
osrunner failed, while the same tests in the runners of Ubuntu an
MacOS passed.  This likely is due how these files are "released" for
deletion with greter ease (Linux/MacOS), or not (Windows).  This is
addressed by function `force_rmtree` added to `__init__.py`, result
of a discussion with Claude AI/Sonnet 4.6.  Simultaneously, this
commit corrects the addition of the file extension `.lnk` in one of
the tests.

When submitted to the check by `ci_pytest.yml`, now each unit test
compiled in `unit_tests.py` passes with Python 3.14 and either
osrunner of Ubuntu 24.04.3, Microsoft Windows Server 2025 /
10.0.26100, and macOS 15.7.4 GitHub currently provides as
ubuntu-latest, windows-latest, macos-latest.

Signed-off-by: Norwid Behrnd <nbehrnd@yahoo.com>

filetags/__init__.py

@@ -53,6 +53,9 @@ try:
 except ModuleNotFoundError:
     have_tkinter = False
 
+import stat
+import tempfile
+
 safe_import('operator')   # for sorting dicts
 safe_import('difflib')    # for good enough matching words
 safe_import('readline')   # for raw_input() reading from stdin
@@ -2521,6 +2524,7 @@ def assert_empty_tagfilter_directory(directory):
         if not options.dryrun:
             safe_import('shutil')  # for removing directories with shutil.rmtree()
             shutil.rmtree(directory)
+            force_rmtree(directory)
             logging.debug('re-creating tagfilter directory "%s" ...' % str(directory))
             os.makedirs(directory)
 
@@ -3278,6 +3282,29 @@ def main():
     successful_exit()
 
 
+def force_rmtree(path):
+    """Provide a rmtree compatible both for Linux/MacOS and Windows.
+
+    Previous definitions worked well for Linux/MacOS and their tests
+    by `unit_tests.py` launched by `pytest` passed with GitHub's
+    osrunners.  However, the very same tests constantly failed with
+    the osrunner of Windows.  After discussion, this function was
+    provided by Claude AI/Sonnet 4.6."""
+    import stat, tempfile
+    def _remove_readonly(func, fpath, _exc):
+        os.chmod(fpath, stat.S_IWRITE)
+        func(fpath)
+    # Windows locks the CWD; move away before attempting deletion
+    try:
+        cwd = os.getcwd()
+        if os.path.abspath(cwd).startswith(os.path.abspath(path)):
+            os.chdir(tempfile.gettempdir())
+    except Exception:
+        pass
+    if os.path.isdir(path):
+        rmtree(path, onerror=_remove_readonly)
+
+
 if __name__ == "__main__":
     try:
         main()

tests/unit_tests.py

@@ -417,8 +417,8 @@ class TestLocateAndParseControlledVocabulary(unittest.TestCase):
 
         # Note: cwd = subdir3
         # Let's create all missing files in all dirs:
-        filetags.create_link(self.subdir2_file, self.subdir1_file)  # create link
-        filetags.create_link(self.subdir2b_file, self.tempdir_file)  # create link
+        filetags.create_link(self.subdir2_file, self.subdir1_file + ".lnk")  # create link
+        filetags.create_link(self.subdir2b_file, self.tempdir_file + ".lnk")  # create link
 
         # prio 1 = .filetag file in startfile directory
         self.assertEqual(filetags.locate_and_parse_controlled_vocabulary(self.subdir1_test_file),