void gtk_numerable_icon_set_background_gicon ( GtkNumerableIcon* self, GIcon* icon )
Updates the icon to use
icon as the base background image.
self will go back using style information
or default theming for its background image.
If this method is called and an icon name was already set as
background for the icon,
icon will be used, i.e. the last method
gtk_numerable_icon_set_background_icon_name() has always priority.
Please do not use it in newly written code.
The argument can be
The data is owned by the caller of the function.