[Interest] CSS: How to select all QLabel which have not the class property set to a certain value

[Philipp Kursawe]

I would like to select all QLabel which do not have the "error" class
property.

This would select all QLabel which have the "error" in their "class"
property.

QLabel[class~="error"] {
}

However, I would like to have the reverse way, all items *not* having this
class. In CSS3 we have "not(x)" but its not available in Qt 5.x Is there a
way to do that?
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