Show selected options when group is collapsed

[Gargaj]

The group feature is great, but it'd be nice to see what option is / options are selected when the group is collapsed; I'm guessing it could be printed after the group name with a different colour / font-style.

[cos-public]

After implementing recent request #78 it's now possible to set up elaborate command line configurations with exclusive groups, so I'm not sure how it would work in my workflow for example:

[Gargaj]

Something like this: (excuse the crude mockup)

(As I noted, the red parts would only need to show when the group is collapsed.)