bzr: ERROR: exceptions.TypeError: run() got an unexpected keyword argument 'new'

While testing difftools with a branch of difftools, I encountered a bug. Looks like --using and --new don't work together:

I'm just diffing against the only other public difftools branch for example:

$ bzr diff --new http://repo.spacepants.org/bzr/plugins/difftools | diffstat
 controller.py | 44 +++++++++++++--------------
 difftool.py | 92 +++++++++++++++++++++++++++++++++++++++-------------------
 2 files changed, 84 insertions(+), 52 deletions(-)

That works okay. Now, let's try it with "--using kompare":

$ bzr diff --new http://repo.spacepants.org/bzr/plugins/difftools --using kompare
bzr: ERROR: exceptions.TypeError: run() got an unexpected keyword argument 'new'

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 846, in run_bzr_catch_errors
    return run_bzr(argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 797, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib/python2.5/site-packages/bzrlib/commands.py", line 499, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/home/wjlanda/.bazaar/plugins/difftools/__init__.py", line 78, in run
    return Controller().run(*args, **kwargs)
TypeError: run() got an unexpected keyword argument 'new'

bzr 1.5 on python 2.5.2 (linux2)
arguments: ['/usr/bin/bzr', 'diff', '--new', 'http://repo.spacepants.org/bzr/plugins/difftools', '--using', 'kompare']
encoding: 'UTF-8', fsenc: 'UTF-8', lang: 'en_US.UTF-8'
plugins:
  bisect /home/wjlanda/.bazaar/plugins/bisect [1.1.0pre0]
  bzrtools /usr/lib/python2.5/site-packages/bzrlib/plugins/bzrtools [1.5.0]
  cvsps /home/wjlanda/.bazaar/plugins/cvsps [unknown]
  difftools /home/wjlanda/.bazaar/plugins/difftools [0.91.0]
  gtk /home/wjlanda/.bazaar/plugins/gtk [0.95.0dev1]
  launchpad /usr/lib/python2.5/site-packages/bzrlib/plugins/launchpad [unknown]
  loom /home/wjlanda/.bazaar/plugins/loom [1.4.0dev0]
  rebase /home/wjlanda/.bazaar/plugins/rebase [0.4.0dev0]
  stats /home/wjlanda/.bazaar/plugins/stats [unknown]
  svn /home/wjlanda/.bazaar/plugins/svn [0.4.11dev0]
  update_mirrors /home/wjlanda/.bazaar/plugins/update_mirrors [unknown]
*** Bazaar has encountered an internal error.
    Please report a bug at https://bugs.launchpad.net/bzr/+filebug
    including this traceback, and a description of what you
    were doing when the error occurred.