Adds the states of the specified types to the state set.
Note that because an #AtkStateSet is a read-only object, this method should
be used to add states to a newly-created set which will then be returned by
#atk_object_ref_state_set. It should not be used to modify the existing state
of an object. See also #atk_object_notify_state_change.
Adds the states of the specified types to the state set.
Note that because an #AtkStateSet is a read-only object, this method should be used to add states to a newly-created set which will then be returned by #atk_object_ref_state_set. It should not be used to modify the existing state of an object. See also #atk_object_notify_state_change.