ConstraintGuide 
    A GtkConstraintGuide is an invisible layout element in a GtkConstraintLayout.
The GtkConstraintLayout treats guides like widgets. They can be used as the source or target of a GtkConstraint.
Guides have a minimum, maximum and natural size. Depending on the constraints that are applied, they can act like a guideline that widgets can be aligned to, or like flexible space.
Unlike a GtkWidget, a GtkConstraintGuide will not be drawn.
Skipped during bindings generation
- parameter - width: width: Out parameter is not supported
- parameter - width: width: Out parameter is not supported
- parameter - width: width: Out parameter is not supported
- method - max-height: Property has no getter nor setter
- method - max-width: Property has no getter nor setter
- method - min-height: Property has no getter nor setter
- method - min-width: Property has no getter nor setter
- method - nat-height: Property has no getter nor setter
- method - nat-width: Property has no getter nor setter
Constructors
Properties
The GtkConstraintStrength to be used for the constraint on the natural size of the guide.