Sets the natural size of guide.
If guide is attached to a gtk.constraint_layout.ConstraintLayout, the constraints will be updated to reflect the new size.
the new natural width, or -1 to not change it
the new natural height, or -1 to not change it
Sets the natural size of guide.
If guide is attached to a gtk.constraint_layout.ConstraintLayout, the constraints will be updated to reflect the new size.