Implement Repository.get_file_graph()

bzr: ERROR: exceptions.NotImplementedError: <bound method GitTexts.get_parent_map of <bzrlib.plugins.git.versionedfiles.GitTexts object at 0x85309ec>>

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/loggraphprovider.py", line 806, in load_filter_file_id
    revids[start:start + chunk_size])
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/util.py", line 879, in decorate
    run_in_loading_queue(f, *args, **kargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/util.py", line 891, in run_in_loading_queue
    f(*args, **kargs)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/logmodel.py", line 79, in load_filter_file_id_chunk
    LogGraphProvider.load_filter_file_id_chunk(self, repo, revids)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/loggraphprovider.py", line 828, in load_filter_file_id_chunk
    check_text_keys(text_keys)
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr/lib/loggraphprovider.py", line 813, in check_text_keys
    for fileid, revid in repo.texts.get_parent_map(text_keys):
  File "/usr/lib/python2.6/dist-packages/bzrlib/plugins/git/versionedfiles.py", line 113, in get_parent_map
    raise NotImplementedError(self.get_parent_map)
NotImplementedError: <bound method GitTexts.get_parent_map of <bzrlib.plugins.git.versionedfiles.GitTexts object at 0x85309ec>>

bzr 2.1.1 on python 2.6.5 (linux2)
arguments: ['/usr/bin/bzr', 'explorer']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'ru_RU.utf8'
plugins:
  bzrtools /usr/lib/python2.6/dist-packages/bzrlib/plugins/bzrtools [2.1.0]
  explorer /usr/lib/python2.6/dist-packages/bzrlib/plugins/explorer [1.0.1]
  git /usr/lib/python2.6/dist-packages/bzrlib/plugins/git [0.4.3]
  launchpad /usr/lib/python2.6/dist-packages/bzrlib/plugins/launchpad [2.1.1]
  netrc_credential_store /usr/lib/python2.6/dist-packages/bzrlib/plugins/netrc_credential_store [2.1.1]
  news_merge /usr/lib/python2.6/dist-packages/bzrlib/plugins/news_merge [2.1.1]
  qbzr /usr/lib/python2.6/dist-packages/bzrlib/plugins/qbzr [0.18.6]