[Xmonad] darcs patch: make createNewWindow set background and ... (and 1 more)

I'm resending this because in the previous patch I forgot to remove the screen rectangle caching. andrea Mon Oct 8 14:52:06 CEST 2007 David Roundy * make createNewWindow set background and foreground to a given color. This means we don't need to draw colors that are this color. Also speeds up redrawing, since the X server can do all the drawing on its own, without talking with xmonad. Mon Oct 8 16:38:01 CEST 2007 Andrea Rossato * DragPane: no need to deal with expose events in this simplified version