Code review comment for lp:~mc-return/compiz/compiz.merge-fix1082001-gridded-windows-jump-workspaces

@sampo55:
Did some experiments with making expo send the start/end_viewport_switch event at the start/end of viewport switch, but I was not able to get it right :(
The main new problem I got by doing that, was that Expo drag-and-dropping windows failed to work once Expo announces start_viewport_switch...
I am quite clueless @ the moment, so if you have a working solution or did experiments yourself, please propose a MP, so we can test it...