[Bugs] #4442 Write UNSP: "Copy to Clipboard" option not available for any adio/video received from a collaborator

[Sugar Labs Bugs]

#4442: "Copy to Clipboard" option not available for any adio/video received from a
collaborator
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    Reporter:  ajay_garg                  |          Owner:  godiard                    
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Write                      |        Version:  Git as of bugdate          
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Fedora                     |   Status_field:  Unconfirmed                
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 1)
 For any "shared" audio/video, initially the recipient only receives the
 thumbnail, and not the full data. Thus, it makes sense to not show "Copy
 to clipboard" at this point.

 2)
 When a thumbnail is clicked, the "data" is fetched from the sharer.

 3)
 Now, the "Copy to clipboard" option should be shown; however, it does not.
 This is because, the palette is initiated JUST ONCE (when the thumbnail is
 created). It then never gets updated, even when the data has been fetched.


 Note that, "Copy to Clipboard" works fine, for all audio/video generated
 locally.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4442>
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