Warning
gtk_stock_add is deprecated and should not be used in newly-written code. 3.10
Registers each of the stock items in items. If an item already
exists with the same stock ID as one of the items, the old item
gets replaced. The stock items are copied, so GTK+ does not hold
any pointer into items and items can be freed. Use
gtk_stock_add_static() if items is persistent and GTK+ need not
copy the array.
Warning gtk_stock_add is deprecated and should not be used in newly-written code. 3.10 Registers each of the stock items in items. If an item already exists with the same stock ID as one of the items, the old item gets replaced. The stock items are copied, so GTK+ does not hold any pointer into items and items can be freed. Use gtk_stock_add_static() if items is persistent and GTK+ need not copy the array.