Sets a #GOptionGroup as main group of the context. This has the same effect as calling glib.option_context.OptionContext.addGroup, the only difference is that the options in the main group are treated differently when generating --help output.
the group to set as main group
Sets a #GOptionGroup as main group of the context. This has the same effect as calling glib.option_context.OptionContext.addGroup, the only difference is that the options in the main group are treated differently when generating --help output.