[Bugs] #4104 sugar HIGH: 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:  High     |      Milestone:  0.98          
   Component:  sugar    |        Version:  Unspecified   
    Severity:  Major    |       Keywords:  regression, r?
Distribution:  OLPC     |   Status_field:  Assigned      
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Comment(by godiard):

 I think the name of the varibles you are using is not clear.

  window_surface = Gdk.Window.create_similar_surface(
         window, cairo.CONTENT_COLOR, width, height)

 should be:

  screenshot_surface = Gdk.Window.create_similar_surface(
         window, cairo.CONTENT_COLOR, width, height)

 because that surface is not the real window surface, but the destination
 of the paint operation.

 Other than that, I think is ok.

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4104#comment:9>
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