Redrawing and clipping regions

[Mark Seaborn <mrs35@cam.ac.uk>]

The MrEd documentation for canvas<%>'s `on-paint' method says that
``any drawing operations performed by on-paint are clipped to the
newly-exposed region; however, the clipping region as reported by
get-clipping-region does not change''.  So how am I supposed to find
out what the clipping region is when redrawing?  Also why does the
whole canvas get redrawn when I resize the window containing it? --
can I change this behaviour?

-- 
         Mark Seaborn
   - mseaborn@bigfoot.com - http://members.xoom.com/mseaborn/ -

             What sort of person uses the word ``diskette''?