What's the URL of the page containing the problem?
http://reviewboard/r/1/diff/1-2/


What steps will reproduce the problem?
1. Edit an existing repo file (called 'rusty'), diff repo, create review
2. `svn add` a new file ('shiny'), diff repo, update existing review
3. View interdiff


What is the expected output? What do you see instead?
* Viewing d1 correctly loads the diff fragment for the file 'rusty'
* Viewing d2 correctly loads a fragment for the new file 'shiny' on top and
shows the existing changes to 'rusty' as in d1, below
* Viewing the interdiff 1-2 incorrectly shows 'rusty' in "Files Changed"
** The only change between the diffs should be the newly-added 'shiny'.
* Furthermore, the 'rusty' diff fragment gives the error:
"Diff currently unavailable.
Error: Internal error. Unable to locate file record for filediff 1"

The URL for the single diff fragment that gets loaded is:
http://reviewboard/r/1/diff/1-2/fragment/1/?index=0&1233643340


What operating system are you using? What browser?
* Clean install of ReviewBoard-1.0alpha2.dev_20090203-py2.5
* Ubuntu 8.04 JeOS
* Firefox 3.0.6


I'm not sure about this, but diffutils.get_diff_files may somehow be
outputting the wrong list of files for the given diffset, interdiffset and
filediff.

Anyway, I reproduced this using a tiny test SVN repo and can provide a dump
plus the original diff files if they'd be of use.