[Interest] Very pixalated rendering when using non-integer as a device scale factor with QGraphicsOpacityEffect applied.

[Pavlo Dyachenko]

Hi, it seems that when screen scale ratio is non integer and opacity is applied the whole widget looks very pixalated.
Example:qputenv("QT_SCALE_FACTOR", QByteArray("1.5"));
QWidget mainWindget;
QLabel label(&mainWindget);
label.setText("Sample Test");
label.setGraphicsEffect(new QGraphicsOpacityEffect(&label));
mainWindget.show();
Running on Windows with QT 5.6. Is it a bug?
Thanks,Pavlo
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