See screenshot at http://david.woodhou.se/wnck-applet.jpeg

The applet doesn't seem to use the full width available on the panel unless it's
forced to by setting the minimum size. Also, its definition of 'when space is
limited' seems to have changed -- it'll let each box in its list get
_really_ tiny now, so that only one character is readable, before it'll
start to group windows.