Comment 8 for bug 337919

@joey: I respectfully disagree. If we make a UI that checks stuff on every user gesture, that UI will get very slow. Updating the information in the UI should not depend on the user doing anything at all. If you add a file on your desktop, and you have a browser window open with your files shown in it, the file should appear in the browser shortly after, without you doing anything at all.

We can do this using clever AJAX stuff. Landscape has similar requirements, and at the MQ sprint in London a few weeks ago, Gustavo and the rest of the MQ enthusiasts designed a scalable system that allows us to do just this kind of thing.