message: Use anti-aliasing when rendering histogram bar
diff: @@ -226,6 +226,9 @@ void RangeHistogram::leaveEvent(QEvent *e)
  void RangeHistogram::paintEvent(QPaintEvent *e)
  {
  QPainter p(this);
  +
  + p.setRenderHint(QPainter::Antialiasing);
  +
  const QBrush blackBrush(QColor(0, 0, 0));
  const QBrush grayBrush(QColor(180, 180, 180));
  const QBrush redBrush(QColor(60, 0, 0));
  