Taking screenshots for the doc [Help]

[Antoni Bella Pérez]

  Hi everybody,

  Recently I takened some app screenshots and I noticed window shadows had 
disappeared. I think that in the windows it is crucial, because in manual 
rendering, their edges are lost into background. 

  Can I set something to fix it?

Ubuntu Impish
 - Qt                   5.15.2
 - Plasma               5.23.0
 - KDE Frameworks       5.87.0
 - KDE Gears           21.08.2
   * Spectacle

  Regards
  Toni
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