Sets the comparison function used when sorting to be sort_func. If
the chooser has the sort type set to #GTK_RECENT_SORT_CUSTOM then
the chooser will sort using this function.
To the comparison function will be passed two #GtkRecentInfo structs and
sort_data; sort_func should return a positive integer if the first
item comes before the second, zero if the two items are equal and
a negative integer if the first item comes after the second.
Sets the comparison function used when sorting to be sort_func. If the chooser has the sort type set to #GTK_RECENT_SORT_CUSTOM then the chooser will sort using this function.
To the comparison function will be passed two #GtkRecentInfo structs and sort_data; sort_func should return a positive integer if the first item comes before the second, zero if the two items are equal and a negative integer if the first item comes after the second.