Like g_sequence_sort(), but uses a #GSequenceIterCompareFunc instead
of a GCompareDataFunc as the compare function
@cmp_func is called with two iterators pointing into @seq. It should
return 0 if the iterators are equal, a negative value if the first
iterator comes before the second, and a positive value if the second
iterator comes before the first.
Like g_sequence_sort(), but uses a #GSequenceIterCompareFunc instead of a GCompareDataFunc as the compare function
@cmp_func is called with two iterators pointing into @seq. It should return 0 if the iterators are equal, a negative value if the first iterator comes before the second, and a positive value if the second iterator comes before the first.