[issue15045] Make textwrap.dedent() consistent with str.splitlines(True) and str.strip()

[Sanyam Khurana]

Change by Sanyam Khurana <sanyam.khurana01 at gmail.com>:


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pull_requests: +4932

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue15045>
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