[ Version ( since = "1.10" ) ]
public void add_child (Actor child)
Adds child to the children of this.
This function will acquire a reference on child that will only be released when calling
remove_child.
This function will take into consideration the depth of child, and
will keep the list of children sorted.
This function will emit the actor_added signal on this.
| this |
a Actor |
| child |
a Actor |