Fix bugs with nested drawers in X.L.Drawer
Fix bugs with nested drawers in X.L.Drawer

Ignore-this: 5c7665f3f3ea2c629deb0cca3715bb8d
There were two bugs:
1. The layout modifier assumed the rect's x was zero.
2. The layout modifier assumed that the stackset's focus actually had focus.

darcs-hash:20100310170159-a5338-19f7aa3df6ad57734d0ebc874e5d758935d19850

yzhou61/xmonad-contrib,yzhou61/xmonad-contrib,yzhou61/xmonad-contrib