[issue2142] difflib.unified_diff(...) produces invalid patches

[Mark Lawrence]

Mark Lawrence <breamoreboy at yahoo.co.uk> added the comment:

The two latest patch files were missing TestDifflib from run_unittest.  Having shown that the tests failed if test_difflib only was patched, then patch difflib against the 3.1 maintainance and py3k branches, the former passed ok and the latter failed.  Could someone please take a look, at the same time considering Mark D's suggestion about using a keyword argument to the unified_diff and context_diff functions.

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nosy: +BreamoreBoy

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