Gets the i-th selected Accessible child of an Selection.
Note that selected_child_index
refers to the index in the list of 'selected' children and generally differs from that
used in get_child_at_index or returned by
get_index_in_parent. selected_child_index
must lie
between 0 and get_n_selected_children - 1, inclusive.
this |
a pointer to the Selection on which to operate. |
selected_child_index |
a int indicating which of the selected children is specified. |
a pointer to a selected Accessible child object, specified by |