Is it possible to wrap long lines in the GitHub diff viewer?

Question

Is it possible to wrap long lines in the GitHub diff viewer?

Maybe a query string param?

Answer 1

Note that from December 3rd, 2013, GitHub now proposes "Soft-wrapping on prose diffs":
(Meaning you might not have to put anything special in the url or as a query to benefit from that feature)

Before:

After:

See as an example a diff on a patch I did, where you can see the line soft-wrapped.