[Bugs] #3027 UNSP: Problems with two active instances

[Sugar Labs Bugs]

#3027: Problems with two active instances
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    Reporter:  dsd                        |          Owner:  dsd                        
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Record                     |        Version:  Unspecified                
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Even with the code that I just pushed to master which releases the
 audio/camera when the activity is no longer active, you cannot switch
 directly between 2 instances of the Record activity. The second one does
 not "win" the camera as it should.

 I suspect this is because the events are not being delivered int he right
 order (is the 2nd instance being told that it is visible before the 1st
 instance is told that it is obscure?), or that simply not enough time is
 left for the first one to release the resources before the second instance
 picks them up (not really sure how this is supposed to work).


 Also see #2570 which must be fixed before we have a smooth multiple-
 instances experience.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3027>
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