docs: def drawOverlay(self, painter, option, rect, icon):
          """
          Draws the overlay pixmap for this item.
          
          :param      painter | <QtGui.QPainter>
                      option  | <QtGui.QSylteOptionIndex>
                      rect    | <QtCore.QRect>
                      pixmap  | <QtGui.QIcon>
          """
          if icon and not icon.isNull():
              painter.drawPixmap(rect, icon.pixmap(rect.width(), rect.height()))