[Bugs] #4104 sugar UNSP: Screenshot is all black in XO-4

[Sugar Labs Bugs]

#4104: Screenshot is all black in XO-4
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    Reporter:  godiard                    |          Owner:  erikos     
        Type:  defect                     |         Status:  new        
    Priority:  Unspecified by Maintainer  |      Milestone:  0.98       
   Component:  sugar                      |        Version:  Unspecified
    Severity:  Unspecified                |       Keywords:             
Distribution:  Unspecified                |   Status_field:  Unconfirmed
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Comment(by manuq):

 I can confirm humitos comment, also with xo-4 build os11.

 - take a screenshot, then go to the Journal, open it: all normal.
 - navigate to another place in the Sugar UI, take another screenshot: is
 the same as the first one

 All successive screenshots are the same.as the first one taken.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4104#comment:4>
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