Removes a child from the selected children list of an Selection.
Note that selected_child_index is the index in the selected-children list, not the index in the parent container.
selected_child_index in this method and child_index in
select_child are asymmetric.
| this |
a pointer to the Selection on which to operate. |
| selected_child_index |
a int indicating which of the selected children of the |
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