Bug 40130 – [Qt] Rendering artifacts when scrolling with a fixed div having a box-shadow

• Status: RESOLVED
• Resolution: WORKSFORME
• Component: Layout and Rendering

Created attachment 57790 [details]
HTML for reproducing the bug 

After loading the attached HTML to a QWebView, the drawn shadow is 'left behind' when scrolling the page upwards. When scrolling down the shadow seems to disappear under the fixed position div. Tried this both on Symbian^3 HW and emulator with a quite new Qt 'unstable' release (please contact me by email if you need more specific details). The same HTML viewed with Anomaly (on the same HW) doesn't seem to suffer from this same problem. The app I used to reproduce the problem was this minimal one:

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

#if defined (Q_OS_SYMBIAN)
    qt_SetDefaultIap();
#endif

    QWebView view;
    QPalette pal = view.palette();
    pal.setBrush(QPalette::Window, Qt::white);
    pal.setBrush(QPalette::Base, Qt::white);
    pal.setBrush(QPalette::Background, Qt::white);
    view.setPalette(pal);

    QNetworkProxyFactory::setUseSystemConfiguration(true);
    view.load(QUrl("file:///C:/data/artifacts.html"));

    view.show();
    return a.exec();
}

[Benjamin Poulain]

I think I fixed that some times ago. You were probably testing the 4.6 branch and not WebKit trunk.