Special padding for group with col -1 and 1
Sometimes we use group to display alternatively one of a set of fields but as the group is rendered using the standard Container (a Table), there is a padding.
So the single field displayed has a double padding and so it is no aligned with the other fields.
I propose to use a HBox and VBox for group with col -1 and 1. This will remove the padding.
For sao, we can keep the table but just remove the padding for the specific cases.