set_default_icon_list

function set_default_icon_list(list:[GdkPixbuf.Pixbuf]):void {
    // Gjs wrapper for gtk_window_set_default_icon_list()
}

Sets an icon list to be used as fallback for windows that haven't had Gtk.Window.prototype.set_icon_list called on them to set up a window-specific icon list. This function allows you to set up the icon for all windows in your app at once.

See Gtk.Window.prototype.set_icon_list for more details.