Default fixed-width font in Qt
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Is there a cross-platform way of getting the user's preferred fixed-width and proportional fonts in Qt?

For example, in Cocoa, there is

    NSFont *proportional = [NSFont userFontOfSize];
    NSFont *fixed-width = [NSFont userFixedPitchFontOfSize];

I would like to find an equivalent in Qt that works in Mac, Linux, and Windows.