[issue22047] Deprecate unsupported nesting of argparse groups

[László Attila Tóth]

László Attila Tóth <laszlo.attila.toth at gmail.com> added the comment:

Hi, according to the group update the _MutuallyExclusiveGroup should have an add_argument_group() call with the deprecation warning, but that method is missing in commit 30322c497e0b8d978f7a0de95985aac9c5daf1ac.

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nosy: +Laszlo.Attila.Toth

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<https://bugs.python.org/issue22047>
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