Adds the given icon_set to the icon factory, under the name stock_id .
stock_id should be namespaced for your application, e.g. "myapp-whatever-icon". Normally applications create a Gtk::IconFactory, then add it to the list of default factories with add_default(). Then they pass the stock_id to widgets such as Gtk::Image to display the icon. Themes can provide an icon with the same name (such as "myapp-whatever-icon") to override your application's default icons. If an icon already existed in factory for stock_id , it is unreferenced and replaced with the new icon_set .
This means that, for example, Gtk::Image::new_from_stock() will be able to find icons in factory . There will normally be an icon factory added for each library or application that comes with icons. The default icon factories can be overridden by themes.
