[issue20491] textwrap: Non-breaking space not honored

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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versions: +Python 3.6, Python 3.7 -Python 2.7, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20491>
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