ConstraintTarget 
    The GtkConstraintTarget interface is implemented by objects that can be used as source or target in GtkConstraints.
Besides GtkWidget, it is also implemented by GtkConstraintGuide.
Inheritors
Types
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                  class ConstraintTargetImpl(gtkConstraintTargetPointer: <Error class: unknown class><<Error class: unknown class>>) : ConstraintTarget
The ConstraintTargetImpl type represents a native instance of the ConstraintTarget interface.