Retrieves the #GIcon used for the icon, or %NULL if there is no icon or if the icon was set by some other method (e.g., by stock, pixbuf, or icon name).
Icon position
A #GIcon, or %NULL if no icon is set or if the icon is not a #GIcon
2.16
See Implementation
Retrieves the #GIcon used for the icon, or %NULL if there is no icon or if the icon was set by some other method (e.g., by stock, pixbuf, or icon name).