Comment 8 for bug 1393020

I see the commit that caused this was a bug fix for https://bugs.launchpad.net/compiz/0.9.11/+bug/1125442
It's probably better when doing something like this to note the bug in the changelog rather than generic entry -

[ Dariusz Gadomski ]
  * CompScreen: Save focused window id before changing viewport.

I see a new proposed commit which seems to fix the ^ but not too sure it may not cause issues with rotate users
(- if that's a concern, (rotate),, then may be good to give a reasonable test before releasing