[Lazarus] Qt4: circle painted with artifact

[AlexeyT]

I noticed that Qt4 build of CudaText paints tabs' X on mouse-over wrong. 
Picture attached (1K). It is ATTabs code - see here

https://github.com/Alexey-T/ATTabs/blob/master/attabs/attabs.pas#L1486

attabs.pas, procedure TATTabs.DoPaintXTo

-- 
Regards,
Alexey

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