no member named 'init' in 'QStyleOption'

Hello, on https://doc.qt.io/qt-6/stylesheet-reference.html#list-of-stylable-widgets, in the QWidget cell, one reads

 

Supports only the background, background-clip and background-origin properties.

If you subclass from QWidget, you need to provide a paintEvent for your custom QWidget as below:
void CustomWidget::paintEvent(QPaintEvent *)

{ [QStyleOption|https://doc.qt.io/qt-6/qstyleoption.html] opt; opt.init(this); [QPainter|https://doc.qt.io/qt-6/qpainter.html] p(this); style()->drawPrimitive([QStyle|https://doc.qt.io/qt-6/qstyle.html]::PE_Widget, &opt, &p, this); }

opt.init(this); should read opt.initFrom(this). QStyleOption has no init() member in either Qt5 or Qt6.