Gets the id of the stock icon being displayed by the GtkStatusIcon.
The storage type of the status icon must be GTK_IMAGE_EMPTY or
GTK_IMAGE_STOCK (see gtk_status_icon_get_storage_type()).
The returned string is owned by the GtkStatusIcon and should not
be freed or modified.
Since 2.10
Gets the id of the stock icon being displayed by the GtkStatusIcon. The storage type of the status icon must be GTK_IMAGE_EMPTY or GTK_IMAGE_STOCK (see gtk_status_icon_get_storage_type()). The returned string is owned by the GtkStatusIcon and should not be freed or modified. Since 2.10