[issue39809] argparse: add max_text_width parameter to ArgumentParser

[Luca]

Luca <lucatrv at hotmail.com> added the comment:

The issue has been fixed in `typeshed`, so the following is now allowed:

width = min(80, shutil.get_terminal_size().columns - 2)
formatter_class = lambda prog: argparse.RawDescriptionHelpFormatter(prog, width=width)

https://github.com/python/typeshed/issues/3806#event-3104796040

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<https://bugs.python.org/issue39809>
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