[issue30920] Sequence Matcher from diff lib is not implementing longest common substring problem correctly

[Tim Peters]

Tim Peters added the comment:

This is an unfortunate consequence of the default "autojunk" feature.  You can turn that off by passing `autojunk=False`, like so:

match = SequenceMatcher(None, string1, string2, autojunk=False)...
                                              ^^^^^^^^^^^^^^^^

Then it returns a match of size 534.

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nosy: +tim.peters

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<http://bugs.python.org/issue30920>
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