Allow the default screen area to be set
Allow the default screen area to be set

For the purposes of confining popup menus, of course. I had planned to use Insets here, but decided
against it now. Oh well, the Background.insets change is nice on its own.

tomfisher/tripleplay,joansmith/tripleplay,tomfisher/tripleplay,tomfisher/tripleplay,joansmith/tripleplay,joansmith/tripleplay,tomfisher/tripleplay,joansmith/tripleplay,tomfisher/tripleplay,joansmith/tripleplay