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Tim, sorry for the inconvenience.  I ran reindent.py over
all the .py files and duplicated what you saw --
test_difflib.py does fail due to white space being removed
from triple-quoted template strings. 

You are correct, the proper action is to run reindent.py
over the .py files and regenerate test_difflib_expect.html.
 (It can be done by temporarily uncommenting three lines in
test_difflib.py on the lines following "# temporarily
uncomment".)  I went through this exercise and verified the
new expectations are OK.  (After regenerating, you may want
to open test_difflib_expect.html just to make sure it
renders reasonably for a sanity check.)  

I would volunteer to generate a new patch file but I do not
have direct access to the CVS archives and this would
probably create as much work for you as I save.  I
appreciate your offer to help.  If there is anything else I
should do let me know by posting here or emailing me
directly at dan.gass at gmail.com.

Thanks,
Dan