How to enable focus effect (as in QLineEdit) for QAbstractScrollArea subclasses?

  • In Qt5 (and KDE), QAbstractScrollArea subclasses (like QTextEdit or QListWidget) don't highlight their frame when they are focused (unlike, e.g., QTextEdit, which gets a nice blue border when it has the focus):
    How can I enable a similar effect for QTextEdit/QListWidget/...?

    I already tried various variantions of frameStyles and I don't think that using setStyleSheet() should be used for such a common problem.?

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