Don't wait for all mounts to succeed when showing the panel button
Currently, when network mounts are present in the fstab, the places plugin takes a few seconds to show its panel button. It would be great if it could show the button before mounting is done. Ideally, the button would even be active (possible mounts would be then missing in the menu as long as mounting isn't finished, then would appear as soon as mounting is finished). But if this isn't possible for some reason, the button could be inactive till mounting is ready. This would at least prevent the panel items to jump again, a few seconds after the panel has been launched.