Code review comment for lp:~smspillaz/unity/unity.fix_84037_864784_868120_872625

Testcase is to make sure that the screen actually redraws the way you'd expect it to. Bonus points if you can

 1) Test with multiple monitors to make sure the blur is correct on both
 2) No blur offsets
 3) No "flickering" when switching workspaces using expo
 4) No crashes when you hotplug a monitor on intel.

There is no unit test.