Funny you should mention this; below is a message from Bob on the issue. The
solution is as trivial as "World borderWidth: 0" :-) Oh, and what
constitutes this as a [BUG]?! ;-)

Cheers,
  - Andreas

> -----Forwarded Message-----
> From: Bob Arning [mailto:arning at charm.net]
> Sent: Friday, February 02, 2001 6:52 PM
> To: Alan.Kay at disney.com; Dan.Ingalls at disney.com; 
> Ted.Kaehler at disney.com;
> Raab, Andreas; John.Maloney at disney.com; Rose, Kim;
> Scott.Wallace at disney.com; arning at charm.net; Rueger, Michael
> Subject: WorldDrawCleanup-ar
> 
> 
> Andreas,
> 
> It's interesting to see your changes in WorldDrawCleanup-ar. 
> About a year ago I was wrestling with an oddity wrt screen 
> redraws. I had an image morph that completely filled the 
> world, but sometimes there appeared to be a faint border that 
> wasn't part of the image. I finally tracked it down to the 
> fact that the world had a one-pixel light green border which 
> was sometimes drawn and sometimes not. With this change, the 
> border is now reappearing regularly (my world has an 
> InfiniteForm as its fill style). I mention this because we 
> may start getting lots of questions about the ring around the 
> world and also to raise the question whether a border width 
> of zero would be a better default for new worlds.
> 
> Cheers,
> Bob
> 

> -----Original Message-----
> From: Karl Ramberg [mailto:karl.ramberg at chello.se]
> Sent: Saturday, February 03, 2001 2:50 AM
> To: squeak at cs.uiuc.edu
> Cc: recipient list not shown
> Subject: [BUG]World has a one pixel green frame.
> 
> 
> Well, I don't know if this is a bug, but when Squeak
> is in a window the world has a one pixel green frame/ border. 
> I think I have seen this as a general issue with 
> PasteUpMorphs .
> 
> Karl
>