How To Enable Anti-Aliasing in View Components

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Scenes rendered within OSG View QML components do not have anti-aliasing applied. What is the correct way to enable anti-aliasing for such scenes?

I have tried the following approaches but to no avail:

• Enable multi-sampling on default QSurfaceFormat (see https://stackoverflow.com/a/49576756).
• Call osg::DisplaySettings::setNumMultiSamples() in main function of application.