set_default_icon_name

function set_default_icon_name(name:String):void {
    // Gjs wrapper for gtk_window_set_default_icon_name()
}

Sets an icon to be used as fallback for windows that haven't had Gtk.Window.prototype.set_icon_list called on them from a named themed icon, see Gtk.Window.prototype.set_icon_name.

Since 2.6