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Re: Zippier outliner development environment?

     Err -- not knowing much about how the outliner is implemented, this  
   doesn't seem like a hard problem.  When you start a drag, you cache the  
   'image' that is being drawn.  Assuming that you have backing-store for the  
   window you are dragging over, this is a very efficient operation.

In general any morph is allowed to change its representation in any
frame, for animation.  For outliners, the values of the slots are
updated even though the outliner is being dragged.  Caching would
defeat this.