Qt窗口不再闪烁WA_PaintOnScreen

//设置WA_PaintOnScreen+paintEngine()，点击或移动助手窗口，连麦对方窗口不再闪烁
OBSQLabelDisplay::OBSQLabelDisplay(QWidget *parent, Qt::WindowFlags flags)
    : QLabel(parent, flags)
{
    //setAttribute(Qt::WA_PaintOnScreen);
    //setAttribute(Qt::WA_StaticContents);
    //setAttribute(Qt::WA_NoSystemBackground);
    //setAttribute(Qt::WA_OpaquePaintEvent);
    setAttribute(Qt::WA_DontCreateNativeAncestors);
    setAttribute(Qt::WA_NativeWindow);
}

QPaintEngine *OBSQLabelDisplay::paintEngine() const
{
    return nullptr;
}