set_selected
Description:
Selects the item at the given position.
If the list does not have an item at position or gtk_invalid_list_position is given, the
behavior depends on the value of the [property@Gtk.SingleSelection:autoselect] property: If it is set, no change will occur and the old item
will stay selected. If it is unset, the selection will be unset and no item will be selected.
Parameters:
| this |
a `GtkSingleSelection` |
| position |
the item to select or gtk_invalid_list_position |