Fix test_defaults_cfg_creation Windows cleanup issue

On Windows, TemporaryDirectory cannot be deleted if it's the current
working directory. The test was doing os.chdir(tmpdir) but never
restoring the original directory, causing cleanup to fail with:
  PermissionError: The process cannot access the file because it is
  being used by another process

Fix: Save original cwd and restore it in finally block before
TemporaryDirectory context manager exits.

Fixes Windows CI test failure.

Author: pocc

tests/test_edge_cases.py

@@ -215,32 +215,36 @@ class TestUncrustifyDefaults:
 
     def test_defaults_cfg_creation(self):
         """Test that defaults.cfg is created if missing."""
+        original_cwd = os.getcwd()
         with tempfile.TemporaryDirectory() as tmpdir:
-            os.chdir(tmpdir)
-            with tempfile.NamedTemporaryFile(
-                mode="w", suffix=".c", delete=False, dir=tmpdir
-            ) as f:
-                f.write("int main() { return 0; }\n")
-                temp_file = f.name
-
             try:
-                # Mock sys.argv for get_added_files()
-                original_argv = sys.argv
-                sys.argv = ["uncrustify-hook", temp_file]
-                cmd = UncrustifyCmd(["uncrustify-hook", temp_file])
-                sys.argv = original_argv
-                # If no -c arg provided, defaults.cfg should be created
-                if "-c" in cmd.args:
-                    idx = cmd.args.index("-c")
-                    config_file = cmd.args[idx + 1]
-                    # Check that config file exists or is defaults.cfg
-                    assert config_file == "defaults.cfg" or os.path.exists(config_file)
+                os.chdir(tmpdir)
+                with tempfile.NamedTemporaryFile(
+                    mode="w", suffix=".c", delete=False, dir=tmpdir
+                ) as f:
+                    f.write("int main() { return 0; }\n")
+                    temp_file = f.name
+
+                try:
+                    # Mock sys.argv for get_added_files()
+                    original_argv = sys.argv
+                    sys.argv = ["uncrustify-hook", temp_file]
+                    cmd = UncrustifyCmd(["uncrustify-hook", temp_file])
+                    sys.argv = original_argv
+                    # If no -c arg provided, defaults.cfg should be created
+                    if "-c" in cmd.args:
+                        idx = cmd.args.index("-c")
+                        config_file = cmd.args[idx + 1]
+                        # Check that config file exists or is defaults.cfg
+                        assert config_file == "defaults.cfg" or os.path.exists(config_file)
+                finally:
+                    if os.path.exists(temp_file):
+                        os.unlink(temp_file)
+                    defaults_path = os.path.join(tmpdir, "defaults.cfg")
+                    if os.path.exists(defaults_path):
+                        os.unlink(defaults_path)
             finally:
-                if os.path.exists(temp_file):
-                    os.unlink(temp_file)
-                defaults_path = os.path.join(tmpdir, "defaults.cfg")
-                if os.path.exists(defaults_path):
-                    os.unlink(defaults_path)
+                os.chdir(original_cwd)
 
 
 class TestOCLintVersionHandling: