[issue10680] argparse: titles and add_mutually_exclusive_group don't mix (even with workaround)

[Martin von Gagern]

Martin von Gagern <Martin.vGagern at gmx.net> added the comment:

I've added a unit test for this nested mutex scenario. The attached patch includes the original fix as well, as for some reason the patch by loewis wouldn't apply to my tree automatically.

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nosy: +gagern
Added file: http://bugs.python.org/file20548/issue10680_withTestcase.patch

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