shut down the viewer loop?

[Stefan van der Walt]

Hi Steven

On 2015-05-21 03:58:14, Steven Drake <drake.steven at gmail.com> 
wrote:
> OK, this is a trimmed down version

Attached, find a fully functional code snippet.  This exits on my 
machine as soon as it is done (but I didn't modify your code at 
all).

Regards
Stéfan

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