Returns the index into the list of siblings for the element at @pos as returned by gtk_widget_path_iter_get_siblings(). If that function would return %NULL because the element at @pos has no siblings, this function will return 0.
position to get the sibling index for, -1 for the path head
Return: 0 or the index into the list of siblings for the element at @pos.
See Implementation
Returns the index into the list of siblings for the element at @pos as returned by gtk_widget_path_iter_get_siblings(). If that function would return %NULL because the element at @pos has no siblings, this function will return 0.