Retrieves the GIcon being displayed by the GtkStatusIcon.
The storage type of the status icon must be GTK_IMAGE_EMPTY or
GTK_IMAGE_GICON (see gtk_status_icon_get_storage_type()).
The caller of this function does not own a reference to the
returned GIcon.
If this function fails, icon is left unchanged;
Since 2.14
Retrieves the GIcon being displayed by the GtkStatusIcon. The storage type of the status icon must be GTK_IMAGE_EMPTY or GTK_IMAGE_GICON (see gtk_status_icon_get_storage_type()). The caller of this function does not own a reference to the returned GIcon. If this function fails, icon is left unchanged; Since 2.14