Why doesn't Qt::AA_DisableHighDpiScaling disable high DPI scaling, and why does Qt::AA_EnableHighDpiScaling disable it?

Here's what I did in the end to forcibly disable any scaling on Qt 5.11:

    QCoreApplication::setAttribute(Qt::AA_DisableHighDpiScaling);    if (qgetenv("QT_FONT_DPI").isEmpty()) {        qputenv("QT_FONT_DPI", "84");    }

CodeHunter

Why doesn't Qt::AA_DisableHighDpiScaling disable high DPI scaling, and why does Qt::AA_EnableHighDpiScaling disable it?

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