[issue10984] argparse add_mutually_exclusive_group should accept existing arguments to register conflicts

[paul j3]

paul j3 added the comment:

While playing with some examples, I found that exclusive group formatting has another failure case.  If the usage line is long enough to wrap, optionals and positionals are formatted separately, with positionals appearing on a separate line(s).  That means that if a group includes a positional, it will not be marked.

So (shortening lines for convenience sake), instead of:

    usage: [-h] ... (-a | -b | x)

we get

    usage: [-h] ... [-a] [-b]
           x

This is true even if arguments are added to the group in the normal way.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10984>
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