[issue28822] Fix indices handling in PyUnicode_FindChar

[STINNER Victor]

STINNER Victor added the comment:

PyUnicode_FindChar-v2.patch LGTM with a minor comment on the review, but I would prefer that Serhiy also reviews it ;-)

Remaining question: what is the behaviour for direction=0, direction=100 or direction=-2? Maybe we can add a few unit tests for strange values of direction? (Not sure if it's worth it.)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28822>
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