insert_child_above
Description:
Inserts child into the list of children of this, above another child of
this or, if sibling is null, above all the children of
this.
This function will acquire a reference on child that will only be released when calling
remove_child.
This function will not take into consideration the depth of child
.
This function will emit the actor_added signal on this.
Parameters:
| this |
a Actor |
| child |
a Actor |
| sibling |
a child of this, or |