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
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).