gtk-icon-factory-add (factory stock-id iconset)

factory -- a gtk-icon-factory object
stock-id -- a string with the icon name
iconset -- a gtk-icon-set instance

Adds the given iconset to the icon factory, under the name stock-id. The argument stock-id should be namespaced for your application, e.g. "myapp-whatever-icon". Normally applications create a gtk-icon-factory object, then add it to the list of default factories with the function gtk-icon-factory-add-default. Then they pass the argument stock-id to widgets such as a gtk-image widget to display the icon. Themes can provide an icon with the same name, such as "myapp-whatever-icon", to override your default icons of the application. If an icon already existed in factory for stock-id, it is unreferenced and replaced with the new iconset instance. The function gtk-icon-factory-add has been deprecated since version 3.10 and should not be used in newly written code. Use the gtk-icon-theme class instead.