set_default_icon_from_file

function set_default_icon_from_file(filename:filename):Boolean {
    // Gjs wrapper for gtk_window_set_default_icon_from_file()
}

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 file on disk. Warns on failure if @err is null.

Since 2.2