QWebEngineView inside of QWidget

[Delta]

Hey Qt Community,

I was trying to create a QWebEngineView inside of an custom QWidget,
and simply add it to it's layout.

But for some reason, it won't update properly.

If I add the QWebEngineView directly into a QMainWindow, everything wors fine.

Am I missing something in custom QWidgets class?

Example code:

class WWebBrowser : public QWidget
{
	 Q_OBJECT
public:
	WWebBrowser(QWidget *parent = (QWidget *)NULL);
	virtual ~WWebBrowser();
};

///

WWebBrowser::WWebBrowser(QWidget *parent) : QWidget(parent)
{
	QVBoxLayout *l = new QVBoxLayout();

	QWebEngineView *m_webView = new QWebEngineView(parent);
	m_webView->load(QUrl("http://www.google.com"));
	l->addWidget(m_webView, 1);

	setLayout(l);
	m_webView->show();
}

WWebBrowser::~WWebBrowser()
{
}

Any suggestions / ideas?

[Delta]

Well, it was caused by a QGraphicsEffect on the QWidget.
After removing it, the QWebEngineView worked without any flaws. weird.