GObject-based rewrite use asynchronous packagekit-glib API use persistent menu widget and notification object update existing notification when new updates become available, close it when no updates are available show status icon when updates are available, hide it when no updates are available hide icon when gpk-update-viewer is executed, check for updates when gpk-update-viewer exits introduce a startup delay before the first check for updates is made add context menu item to manually trigger a check for updates remove context menu item for quitting pk-update-icon