QWebEngineView Flickers on Resize

Erika

Hello, I'm learning how to work with QWebEngineView, and I noticed there are large amounts of flickering. Before I report a bug, I wanted to check that I'm using it correctly with QWidgets/QMainWindow.

#include <QtCore>
#include <QtWidgets\QMainWindow>
#include <QtWebEngineWidgets>

int main( int argc, char * argv[] )
{
	QApplication app( argc, argv );
	QMainWindow mainWindow;

	QWebEngineView *webView = new QWebEngineView;
	webView->load( QUrl( "https://www.qt.io" ) );

	mainWindow.setCentralWidget( webView );
	mainWindow.resize( 800, 600 );
	mainWindow.show();

	return app.exec();
}

Resize Flickering Result:
http://screencast.com/t/96xRjqJgb

To avoid the flickering, I've tried, unsuccessfully, setting the following attributes:

	webView->setAttribute( Qt::WA_OpaquePaintEvent, true );
	webView->setAttribute( Qt::WA_PaintOnScreen, true );
	webView->setAttribute( Qt::WA_DontCreateNativeAncestors, true );
	webView->setAttribute( Qt::WA_NativeWindow, true );
	webView->setAttribute( Qt::WA_NoSystemBackground, true );
	webView->setAutoFillBackground( false );

I've also tried nesting it under a QWidget object. I believe there is a delay between when the QMainWindow resizes, and when the QWebEngineView receives the resize event. I've done my best to look this up on stackoverflow/here/in the Qt documentation.

I'm running Qt 5.7.0 on Windows 10, and it happens in both Debug and Release mode. Any thoughts?

VaL Doroshchuk

Hi. already fixed in https://bugreports.qt.io/browse/QTBUG-46074