Rewrite root thread resizing code, remove width: 99999px
Rewrite root thread resizing code, remove width: 99999px

Let the browser calculate the appropriate width.  And ignore pages
without .dw-depth-0, there's always a root thread nowadays?

debiki/debiki-server-old,debiki/debiki-server-old,debiki/debiki-server-old,debiki/debiki-server-old