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Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.6.3, 5.7.2, 5.8.0
Affects Version/s: 5.6.2, 5.7.1, 5.8.0 Beta
Component/s: WebChannel, WebEngine
Labels:
None
Environment:
macos 10.12

Commits:
ff26fa899f095eff9b3265b462e97c7e48ab06f5 (5.6) dd80dd0e4efcdfcc33f71a4f964aa9d2d40c4af0 (5.7) 39f7ce19dbce34dfa7e730d6fa743d88109c3369(5.8)

The second QWebEngineView window occurs "qt is not defined" error when you create second QWebEngineView and show it in WebPage::createWindow(WebWindowType type) function.

I guess related to https://bugreports.qt.io/browse/QTBUG-53411 and https://bugreports.qt.io/browse/QTBUG-54107.
5.6.2 does not effect.

Can reproduce by fix markdowneditor demo code as following:

bool PreviewPage::acceptNavigationRequest(const QUrl &url,
                                          QWebEnginePage::NavigationType /type/,
                                          bool /isMainFrame/)
{
    // Only allow qrc:/index.html.
    if (url.scheme() == QString("qrc"))
        return true;
    QWebEngineView   *v=new QWebEngineView();
    PreviewPage *page = new PreviewPage(v);
    v->setPage(page);
    v->setUrl(QUrl("qrc:/index.html"));
    v->show();
    //QDesktopServices::openUrl(url);
    return false;
}