Error message on import of QWebEngineView

[David Cortesi]

When my code, long subsequent to creating the QApplication and a main
window, hits this statement,

    from PyQt6.QtWebEngineWidgets import QWebEngineView

the following error message appears,

Qt WebEngine seems to be initialized from a plugin. Please set
Qt::AA_ShareOpenGLContexts using QCoreApplication::setAttribute and
QSGRendererInterface::OpenGLRhi using QQuickWindow::setGraphicsApi before
constructing QGuiApplication.

I could do the first thing at the time I create the QApplication, but I
never have cause to import QQuickWindow and don't want to.

Can anybody shed light on what this is about?
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