[Telepathy] unable to answer video calls in empathy

[Daniel Pocock]

I've noticed that Gnome popups appear truncated/cut off on the right
hand side of the screen

For an incoming video call, this means I can see the `Answer' option but
`Answer with video' is obscured

This is a regression in Debian wheezy and makes empathy very awkward to
work with unfortunately

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=693837