This adds some meaningful functionality to the notification icons in the tray
and in the notification pop-up and allows to switch to the application that
sent the notification.
We get the application from the notification context and set it on the source
for the notification.
Currently the messagetray opens up everytime the user hits the bottom of the screen.
To avoid this "opening by accident" this patch changes the behaviour so that:
1) It only opens when there is a notification showing or
2) When the user hits the summary area (assuming he wants to interact with it)
Includes fixes from https://bugzilla.gnome.org/show_bug.cgi?id=607244#c17https://bugzilla.gnome.org/show_bug.cgi?id=607244
This helps illustrate that expired notifications move to the summary view.
Animate the separate components of the message tray individually
as in http://www.gnome.org/~mccann/shell/mockups/20090630-demo
Based on the patch from Florian Müllner.