Variability: Grey out non-editable cells in the variant configuration dialog
Mandatory features shall be greyed out to indicate they cannot be deselected.
Testing instructions:
- Create/open an AF3 Project with a feature model that contains optional, non-optional and alternative features.
- Right-click on the project and select "Generarte variant of AF3-Project"
- Observe: Non-optional features are greyed out an indicated as "non-optional".
Edited by Andreas Bayha