On Aug 15, 2013, at 10:45 , Stéphane Ducasse <[email protected]> wrote:

> probably that show: invokes somehow doLayoutIn:
> 
> Stef

Yes, when you show something on screen, its layout usually has to be computed 
first.
To be on the safe side, never use anything but #haltOnce to debug graphics 
code, or you WILL end up in infinite loops hanging your image really, really 
often. 
Which should also answer your question of why can interrupt the UI process, 
it's the only foolproof way to debug UI code in a familiar way ;)

Cheers,
Henry

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