Comment 2 for bug 30659

libwnck adds a NET_WM_STATE_FULLSCREEN status apps can use to prevent the screensaver from lockong while in fullscreen mode (gnome-screensaver respects this setting), i think something like NET_WM_STATE_LOCK_OVERRIDE with the same functionallity should be added to libwnck to make it possible for the screensaver to determine that an app is trying to prevent the locking (indeed ekiga could abuse the fullscreen state as a workaround)