[Interest] CSS class only works in designer, not during runtime

[Philipp Kursawe]

I want to style my QLineEdit in case of an error like this:

QLineEdit.error { border: 2px solid orange; }

I have set this style on the QLE parent widget. When I add the dynamic
"class" property in the designer and set it to "error" the QLE gets a nice
thick orange border.
However if I do the same in code:
edit->property("class", "error")
the QLE does not change its border.

Any ideas? Do I need to force it to refresh?
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