Scroll the dirty region with WA_PaintOnScreen
Scroll the dirty region with WA_PaintOnScreen

When QWidget::scroll() is called on a widget with WA_PaintOnScreen,
scroll the dirty region.

Task-number: 254742
Reviewed-by: bnilsen

KDE/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,KDE/qt,igor-sfdc/qt-wk,igor-sfdc/qt-wk,RLovelett/qt,igor-sfdc/qt-wk,RLovelett/qt,RLovelett/qt,KDE/qt,radekp/qt,igor-sfdc/qt-wk,radekp/qt,RLovelett/qt,RLovelett/qt,igor-sfdc/qt-wk,radekp/qt,RLovelett/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,radekp/qt,KDE/qt,radekp/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt,igor-sfdc/qt-wk,KDE/qt,igor-sfdc/qt-wk,radekp/qt,igor-sfdc/qt-wk,radekp/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,KDE/qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,radekp/qt,radekp/qt,KDE/qt,KDE/qt,radekp/qt,RLovelett/qt,igor-sfdc/qt-wk,pruiz/wkhtmltopdf-qt,RLovelett/qt,pruiz/wkhtmltopdf-qt,pruiz/wkhtmltopdf-qt