Hi,

We have a problem where the diff viewer for diffs with "rename" operations. 
We use mercurial, and output the diff in git style.

Here's a trivial example diff file:

diff --git a/include/CCvideo/configUI.H b/include/CCvideo/configUITest.H
rename from include/CCvideo/configUI.H
rename to include/CCvideo/configUITest.H

In the Diff summary section is:

include/CCvideo/configUITest.H 
<http://reviewboard.cctechnol.com/r/4112/diff/#0> 
Was include/CCvideo/configUI.H

So I guess the rename works up to a point, but this is the error in the 
view diff page:

The file 'include/CCvideo/configUI.H' (rUNKNOWN) could not be found in the 
repository

This may be a bug in the software, a temporary outage, or an issue with the 
format of your diff. 

Please try again, and if you still have trouble, contact support 
<http://reviewboard.cctechnol.com/support/>. 

With traceback as follows:

Traceback (most recent call last):
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/views.py",
 line 236, in get
    renderer = self.create_renderer(context, *args, **kwargs)
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/reviews/views.py",
 line 1088, in create_renderer
    *args, **kwargs)
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/views.py",
 line 328, in create_renderer
    self.diff_file = self._get_requested_diff_file()
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/views.py",
 line 369, in _get_requested_diff_file
    request=self.request)
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/diffutils.py",
 line 383, in populate_diff_chunks
    chunks = generator.get_chunks()
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/chunk_generator.py",
 line 153, in get_chunks
    large_data=True)
  File 
"/usr/lib/python2.6/site-packages/Djblets-0.8.10-py2.6.egg/djblets/cache/backend.py",
 line 111, in cache_memoize
    data = lookup_callable()
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/chunk_generator.py",
 line 152, in <lambda>
    lambda: list(self._get_chunks_uncached()),
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/chunk_generator.py",
 line 159, in _get_chunks_uncached
    old = get_original_file(self.filediff, self.request, encoding_list)
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/diffviewer/diffutils.py",
 line 169, in get_original_file
    request=request)
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/scmtools/models.py",
 line 291, in get_file
    large_data=True)[0]
  File 
"/usr/lib/python2.6/site-packages/Djblets-0.8.10-py2.6.egg/djblets/cache/backend.py",
 line 111, in cache_memoize
    data = lookup_callable()
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/scmtools/models.py",
 line 290, in <lambda>
    request)],
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/scmtools/models.py",
 line 456, in _get_file_uncached
    data = self.get_scmtool().get_file(path, revision)
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/scmtools/hg.py",
 line 43, in get_file
    return self.client.cat_file(path, six.text_type(revision))
  File 
"/usr/lib/python2.6/site-packages/ReviewBoard-2.0.7-py2.6.egg/reviewboard/scmtools/hg.py",
 line 264, in cat_file
    raise FileNotFoundError(path, rev)
FileNotFoundError: The file 'include/CCvideo/configUI.H' (rUNKNOWN) could not 
be found in the repository


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