a UTF-8 string
length of @text, or -1 if @text is nul-terminated.
Return: the new script iterator, initialized to point at the first range in the text, which should be freed with pango_script_iter_free(). If the string is empty, it will point at an empty range.
ConstructionException GTK+ fails to create the object.
1.4
Create a new #PangoScriptIter, used to break a string of Unicode into runs by text. No copy is made of @text, so the caller needs to make sure it remains valid until the iterator is freed with pango_script_iter_free().