Returns the index of the currently active item, or -1 if there's no
active item. If the model is a non-flat treemodel, and the active item
is not an immediate child of the root of the tree, this function returns
gtk_tree_path_get_indices (path), where
path is the
GtkTreePath of the active item.
[integer] An integer which is the index of the currently active item, or -1 if there's no active item.
Derived by RGtkGen from GTK+ documentation
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