Cloning to F17.

+++ This bug was initially created as a clone of Bug #856242 +++

Description of problem:
spice software cursor jumping to the edges and corners randomly
  * latest 0.12.something from koji doesn't have this bug
  * the bug occurs when I rebuild current fedora's 0.10 in RHEL
==> rebase to 0.12 would fix the thing

Version-Release number of selected component (if applicable):
spice-vdagent-0.10

How reproducible:
always

Steps to Reproduce:
1. grab a window in a VM running spice-vdagent, move it slowly
2.
3.
  
Actual results:
cursor and window jumps sometimes to the edges and back

Expected results:
cursor should move just as mouse moves

Additional info:
F17 (and probably F16) is affected as well making especially gnome-shell unusable because of unwanted Activities triggering so rebase of spice-vdagent there would be also wise.