Returns the GObject.TypePlugin structure for the dynamic interface
interface_type which has been added to instance_type, or null
if interface_type has not been added to instance_type or does
not have a GObject.TypePlugin structure. See g_type_add_interface_dynamic().
Returns the GObject.TypePlugin structure for the dynamic interface
interface_typewhich has been added toinstance_type, ornullifinterface_typehas not been added toinstance_typeor does not have a GObject.TypePlugin structure. Seeg_type_add_interface_dynamic().