[issue36111] Negative `offset` values are no longer acceptable with implementation of `seek` with python3 when in text mode; should be per POSIX

[Enji Cooper]

Enji Cooper <yaneurabeya at gmail.com> added the comment:

Opening and seeking using SEEK_END worked in text mode with python 2.7. I'm not terribly sure why 3.x should depart from this behavior:

>>> fp = open("configure", "rt"); fp.seek(-100, os.SEEK_END)
>>> fp.tell()
501076

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36111>
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