gtk:constraint-layout-add-constraint (layout constraint)

layout -- a gtk:constraint-layout object
constraint -- a gtk:constraint object

Adds a gtk:constraint object to the layout manager. The source and target properties of constraint can be:

• set to nil to indicate that the constraint refers to the widget using layout
• set to the gtk:widget object using layout
• set to a child of the gtk:widget object using layout
• set to a gtk:constraint-guide object that is part of layout

The layout acquires the ownership of constraint after calling this function.