"bzr mv" broken for git trees

[Jelmer Vernooij]

% bzr mv AUTHORS AUTHORS.md
brz: ERROR: AttributeError: 'GitWorkingTree' object has no attribute 'get_canonical_inventory_path'

Traceback (most recent call last):
  File "/home/jelmer/src/breezy/breezy/commands.py", line 1009, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/home/jelmer/src/breezy/breezy/commands.py", line 1194, in run_bzr
    ret = run(*run_argv)
  File "/home/jelmer/src/breezy/breezy/commands.py", line 760, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/jelmer/src/breezy/breezy/commands.py", line 784, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/home/jelmer/src/breezy/breezy/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/home/jelmer/src/breezy/breezy/cleanup.py", line 165, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/home/jelmer/src/breezy/breezy/builtins.py", line 1018, in run
    self._run(tree, names_list, rel_names, after)
  File "/home/jelmer/src/breezy/breezy/builtins.py", line 1068, in _run
    src = tree.get_canonical_inventory_path(rel_names[0])
AttributeError: 'GitWorkingTree' object has no attribute 'get_canonical_inventory_path'

brz 3.0.0dev1 on python 2.7.15 (Linux-4.18.0-1-amd64-x86_64-with-debian-
    buster-sid)
arguments: ['/home/jelmer/src/breezy/brz', '-Dhpss', 'mv', 'AUTHORS',
    'AUTHORS.md']
plugins: apt[unknown], bash_completion[3.0.0dev1], changelog_merge[3.0.0dev1],
    commitfromnews[unknown], cvs[3.0.0dev1], darcs[unknown], debian[2.8.6],
    email[unknown], fastimport[unknown], grep[3.0.0dev1], jelmer[unknown],
    launchpad[3.0.0dev1], mtn[3.0.0dev1], netrc_credential_store[3.0.0dev1],
    news_merge[3.0.0dev1], po_merge[3.0.0dev1], propose[unknown],
    repodebug[unknown], stats[3.0.0dev1], upload[3.0.0dev1],
    weave_fmt[3.0.0dev1]
encoding: 'utf-8', fsenc: 'UTF-8', lang: 'en_GB.UTF-8'

*** Bazaar has encountered an internal error. This probably indicates a
    bug in Bazaar. You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/brz/+filebug
    including this traceback and a description of the problem.