[Bugs] #4208 Paint UNSP: Paint: improve scaling

[Sugar Labs Bugs]

#4208: Paint: improve scaling
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    Reporter:  manuq                      |          Owner:  godiard    
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  Paint                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:  triage     
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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 It feels a bit slow, giving poor feedback to the user because it doesn't
 update the preview in real time.  Maybe it can be improved with the Cairo
 filter we learned resizing the image in Image Viewer.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4208>
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