KeyError on the root folder inside volume manager

The trace is:

2011-06-27 18:01:33,697 - ubuntuone.SyncDaemon.fsm - DEBUG - get_by_path(\\?\C:\Users\Test\Ubuntu One\) with idx {u'\\\\?\\C:\\Users\\Test\\Ubuntu One\\yadda': '2ddb851d-bc2e-4a1d-8b87-113fee73da8a', u'\\\\?\\C:\\Users\\Test\\Ubuntu One\\images\\inner': 'a1ceb8f8-fbcc-4a11-978e-af96aa286042', '\\\\?\\C:\\Users\\Test\\Ubuntu One\\file.18.txt': '9bee0973-8300-4f48-96cb-679356a135a6', '\\\\?\\C:\\Users\\Test\\Ubuntu One': '7172c671-ccbb-4505-badf-efe86c43837d', u'\\\\?\\C:\\Users\\Test\\Ubuntu One\\images': 'e7812341-9288-47f4-b1f9-9b182ec341d6', u'\\\\?\\C:\\Users\\Test\\Ubuntu One\\empty': '670e3f42-7d09-4513-975b-0fafc8394c62'}
2011-06-27 18:01:33,697 - ubuntuone.SyncDaemon.sync - ERROR - Node delta for :407d60a4-2153-4b99-b631-76b6126a27b5 can't be applied.
Traceback (most recent call last):
  File "C:\Users\Test\src\extra_os_helper_logging\ubuntuone\syncdaemon\sync.py", line 1156, in handle_AQ_DELTA_OK
    os.path.dirname(node.path))
  File "C:\Users\Test\src\extra_os_helper_logging\ubuntuone\syncdaemon\filesystem_manager.py", line 775, in get_by_path
    mdid = self._idx_path[path]
KeyError: '\\\\?\\C:\\Users\\Test\\Ubuntu One\\'

This is caused becasue os.path.normpath will not normalize paths that starts with the \\\\?\\ prefix. Refer to the source code for details, but the key part is:

def normpath(path):
    """Normalize path, eliminating double slashes, etc."""
    # Preserve unicode (if path is unicode)
    backslash, dot = (u'\\', u'.') if isinstance(path, unicode) else ('\\', '.')
    if path.startswith(('\\\\.\\', '\\\\?\\')):
        # in the case of paths with these prefixes:
        # \\.\ -> device names
        # \\?\ -> literal paths
        # do not do any normalization, but return the path unchanged
        return path

We need to handle path normalization by our own, on the window side.