[Bugs] #1899 UNSP: Do not use deprecated API

[Sugar Labs Bugs]

#1899: Do not use deprecated API
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    Reporter:  alsroot                    |          Owner:  benzea
        Type:  defect                     |         Status:  new   
    Priority:  Unspecified by Maintainer  |      Milestone:  0.88.x
   Component:  sugar-artwork              |        Version:  0.88.x
    Severity:  Blocker                    |       Keywords:  r?    
Distribution:                             |   Status_field:  New   
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Comment(by sascha_silbe):

 Patch is straightforward and fixes the issue. Benzea, can we get this into
 mainline (i.e. r+ from you) ASAP, please?

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1899#comment:5>
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