Hide an Option_group from help

[jbriales]

Is there any easy way to hide a whole Option_group and its contained options from the help message?
I know opt->group(""); makes the option disappear from help,
but e.g. auto group = app.add_option_group(""); still shows the contained options within an unnamed group.

[phlptp]

I hadn't considered this, but I will take a look at that see if that could be made to work.