why there is not "pango_layout_iter_previous_line"



there is a function "pango_layout_iter_next_line" in pango. but if I want to the previous line, what can I do ?
It is used when I scroll the text.  If I frequently call  "pango_layout_get_line", is the efficiency very low ?

I think the list linking pango lines should be GList, not GSList



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