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.?