It removes the 'Window is ready' notification and puts the window immediately into focus instead.
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If this is the behaviour you want, that's cool!
yeah because firefox's jump to existing window using addressbar, pidgin's present conversation when clicking notification, and deluge's focus deluge window when clicking tray icon are quite broken without it >.<
That's a matter of passing timestamps around, instead of using CurrentTime. Both firefox and deluge, as you describe them, have relevant timestamps from X events. pidgin doesn't, because org.fd.Notifications doesn't support them, but that's definitely a bug in the specification. It would be helpful if you could report it, either at gnome-shell, libnotify or directly at xdg-list.