[RFC PATCH 05/13] b4: normalise git-reported absolute paths with os.path.normpath

git rev-parse --git-common-dir emits forward-slash paths on Windows even
though the OS uses backslashes.  Pass the result through
os.path.normpath so all callers receive a path in the native format on
every platform.

Signed-off-by: Adrian Neftali Sanchez <[email protected]>
---
 src/b4/__init__.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/b4/__init__.py b/src/b4/__init__.py
index bddf2db..262668f 100644
--- a/src/b4/__init__.py
+++ b/src/b4/__init__.py
@@ -4534,6 +4534,11 @@ def git_get_common_dir(path: Optional[str] = None) -> Optional[str]:
             topdir = git_get_toplevel(path)
             if topdir:
                 result = os.path.normpath(os.path.join(topdir, result))
+        else:
+            # Normalize absolute paths to use the OS-native separator.
+            # On Windows, git outputs forward-slash paths; normpath converts
+            # them to backslashes so all callers see a consistent format.
+            result = os.path.normpath(result)
         return result
     return None
 
-- 
2.45.0.windows.1