the data for the new element
the function to compare elements in the list. It should return a number > 0 if the first parameter comes after the second parameter in the sort order.
user data to pass to comparison function
Return: the (possibly changed) start of the #GList
2.10
Inserts a new element into the list, using the given comparison function to determine its position.
If you are adding many new elements to a list, and the number of new elements is much larger than the length of the list, use g_list_prepend() to add the new items and sort the list afterwards with g_list_sort().