QTextLayout doesn't draw Cursor when background not drawn

void AnnotationText::paint(QPainter *painter, const QStyleOptionGraphicsItem *style, QWidget *widget)
{
   // Paint border
   AbstractAnnotationRect::paint(painter, style, widget);

   auto textArea = mRect->normalized();
   if (mIsInEditMode) {
      setupEditModeOutlinePen();
      painter->setPen(mEditModeOutlinePen);
      painter->drawRect(textArea);
   }

   // Paint text
   painter->setPen(properties()->textColor());
   auto margin = properties()->width();

   painter->setClipRect(boundingRect().adjusted(margin, margin, -margin, -margin));

   QFontMetrics fontMetrics(textProperties()->font());
   auto boxHeight = 0;

   QTextDocument document(mText);
   for (auto block = document.begin(); block != document.end(); block = block.next()) {
      auto blockPosition = block.position();
      auto blockLength = block.length();
      QTextLayout textLayout(block);
      textLayout.setFont(textProperties()->font());
      auto blockHeight = 0;
      textLayout.setCacheEnabled(true);

      textLayout.beginLayout();
      while (true) {
         auto line = textLayout.createLine();
         if (!line.isValid()) {
            break;
         }

         line.setLineWidth(textArea.width() - margin * 2);
         blockHeight += fontMetrics.leading();
         line.setPosition(textArea.adjusted(margin, margin, 0, 0).topLeft());
         blockHeight += line.height();
      }
      textLayout.endLayout();

      textLayout.draw(painter, QPoint(0, boxHeight));

      painter->setBrush(Qt::NoBrush);
      painter->drawRect(textArea);

      if (mTextCursor.isVisible() && (mTextCursor.position() >= blockPosition && mTextCursor.position() < blockPosition + blockLength)) {
         textLayout.drawCursor(painter, QPointF(0, boxHeight), mTextCursor.position() - blockPosition, 1);
      }
      boxHeight += blockHeight;
   }
}