I have a generally stock configured Unity 2d, with the launcher in auto-hide mode. When I get a notification, the launcher pops out and the relevant icon wiggles. That is all functioning well.

My problem is that the launcher pops out for maybe 5 seconds before hiding. Often times I'm typing or using the mouse on the portion of the display that is now covered by the launcher. After I've mentally received the notification is there some way to tell the launcher "I've seen this, you can go away now".

Note, I'm not wanting to modify or shorten the default display time. I'd be very happy to hit 'alt-h' or some other key combination to make it go away.