[issue30620] textwrap: dedent contains logic that can never execute

[Emily Morehouse]

Emily Morehouse added the comment:

Jonathan, could you improve the comments for the dedent function? You have a great understanding of the logic flow from your proof and it would be beneficial to document this to avoid future confusion.

Specifically, it should be clear that Clause 2 inherently handles equivalence for margin and indent and that Clause 4 will always complete with the break statement.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue30620>
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