Retrieves the icon name used for the icon, or NULL if there is no icon or if the icon was set by some other method (e.g., by pixbuf, stock or gicon).
Icon position
An icon name, or NULL if no icon is set or if the icon wasn’t set from an icon name
2.16
Retrieves the icon name used for the icon, or NULL if there is no icon or if the icon was set by some other method (e.g., by pixbuf, stock or gicon).