NewTabbed: we must check if the sceen rectangle changed
NewTabbed: we must check if the sceen rectangle changed

- Check if rectangle changed
- removed orphan instances warnings
- some code formatting

darcs-hash:20070926114056-32816-82fecbb401a9b189de27199a5e528ec9849e19ea

jthornber/XMonadContrib,jthornber/XMonadContrib