NSRadio button 10.7 behavior is not implemented in GNUstep

[gcasa]

The behavior described here is not implemented in GNUtstep.

https://stackoverflow.com/questions/61243478/assign-radio-group-to-radio-buttons

I have created the following test:

https://github.com/gcasa/NSRadio_test

Steps to recreate:

1. in Xcode on a mac create a new application
2. Add two radio buttons in the same view
3. Connect them to the same actions
4. Build it on gs using buildtool
5. test

Expected: Radio buttons should behave properly Actual: Radio buttons do not behave correctly