paul j3 added the comment:
In
_ActionsContainer._add_container_actions there is this note:
# add container's mutually exclusive groups
# NOTE: if add_mutually_exclusive_group ever gains title= and
# description= then this code will need to be expanded as above
In other bug/issues we've noted that the way to give an exclusive group a title
and description is to nest it in an argument_group.
So it looks like no one has worked through the details - in this parent
situation - of adding a nested mutually exclusive group.
In my preliminary tests, it looks like the 'group_map' is being messed up by
the block of code that adds the mutually_exclusive_groups. I don't know how
easy it is to fix that.
The immediate user solution is not use parents and nested mutually exclusive
groups together.
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nosy: +paul.j3
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<http://bugs.python.org/issue25882>
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