[Bugs] #1443 UNSP: leaking pixmaps when switching activities

[Sugar Labs Bugs]

#1443: leaking pixmaps when switching activities
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    Reporter:  tomeu                      |          Owner:  erikos                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-toolkit              |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 probably need to explicitly dispose it in Activity.get_preview

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1443>
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