[Bugs] #1250 UNSP: Do not requery if visibility wasn't changed

[SugarLabs Bugs]

#1250: Do not requery if visibility wasn't changed
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    Reporter:  alsroot                    |          Owner:  tomeu                      
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar                      |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:  r?                         
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 |TestCase|
 open non-ds volume
 move mouse cursor away from non-ds volume icon
 move mouse cursor back to non-ds volume icon
 while opening icon palette list view blinks(since it reread non-ds volume)

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Ticket URL: <http://dev.sugarlabs.org/ticket/1250>
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