void g_sequence_sort_changed ( GSequenceIter* iter, GCompareDataFunc cmp_func, gpointer cmp_data )
Moves the data pointed to by
iter to a new position as indicated by
function should be called for items in a sequence already sorted according
cmp_func whenever some aspect of an item changes so that
may return different values for that item.
cmp_func is called with two items of the
It should return 0 if the items are equal, a negative value if
the first item comes before the second, and a positive value if
the second item comes before the first.