Optimize dirty regions of groups + effect

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      Groups with effects are currently fully rendered.
      For Lombard, we should optimize this in 2 ways:
      - ignore effects that don't change surrounding pixels
      - add some padding to the others

        1.
        		 Implementation of pixelAffectsSurroundingPixels check for effects Sub-task Closed Martin Sládeček  
        2.
        		 Dirty region of nodes under group with effect should adjust itself so that it covers every affected pixels Sub-task Resolved Radko Najman (Inactive)  

            Assignee:
            Radko Najman (Inactive)
            Reporter:
            Martin Sládeček
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              Created:
              Updated:
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