[PATCH][BUG] StringIO mixes poorly with difflib

[John A Meinel]

difflib likes to return a generator, rather than returning the actual text.
StringIO.writelines() tries to pre-allocate, and makes a "len()" request
on it's argument.
However, a generator has no length.

Basically, the simple fix is to just change diff.py with the attached patch.

John
=:->

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