This fixes the scrollbar overlapping problem that Tim posted about
awhile ago.  This fix is pretty simple... it just checks to see which of
the up-arrow or menu-button is lowest, and uses that as the upper bounds
for the slider (thumb).  Not sure why I didn't think of it before. 
Works with 3.2 or 3.3alpha.

- Doug Way
  dway at riskmetrics.com


from preamble:

"Change Set:		ScrollbarButtonOverlap-dew
Date:			5 February 2002
Author:			Doug Way

A simple fix for the problem of the scrollbar thumb overlapping the
scrollbar menu-button/up-arrow when you scroll up all the way.  It would
occur in existing windows when the alternativeScrollbarLook preference
is toggled.  This will also fix the problem in old windows such as the
Welcome To... window, etc.  The fixed method simply checks which button
is the lower of the two."!
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