Freeze break request: "boxPointer" positioning for gnome-shell

[Owen Taylor <otaylor redhat com>]

I'd like to land my set of three patches in:

 https://bugzilla.gnome.org/show_bug.cgi?id=645744

They fix three things:

 - They are an alternative fix to the crash when clicking on
   notifications (https://bugzilla.gnome.org/show_bug.cgi?id=645697)

 - The restore the slide animation that is supposed to happen when Shell
   popup menus and notification bubble are opened. While it's
   certainly not an essential feature, it's a nice touch, and it
   seems lame to lose that slick touch that a contributor spent
   a bunch of time on via accidental regression a few days before
   the release.

 - The fix a bunch of warnings that are spewed to stderr if you mouse
   over other status icons while you have a right click menu on
   a notification open.

While they aren't tiny I'm pretty confident - the first patch is
basically a cut-and-paste of code from Clutter, the second is a
straightforward substitution, and the third patch takes some flawed
code that we were adding layers of band-aids on top of and reworks
it a simpler way.

- Owen