Render artefacts on top right of Hex Table about qhexview HOT 6 CLOSED

    const int lineHeight = m_renderer->lineHeight();
    const qint64 first = firstvisible + std::max(0, (r.top() / lineHeight) - 1);
    const qint64 last = firstvisible + (r.bottom() / lineHeight) + 1;
    int count = static_cast<int>((last - first) + 1);

    const quint64 firstVisible = this->firstVisibleLine();
    const int lineHeight = m_renderer->lineHeight();
    const int headerCount = m_renderer->headerLineCount();

    const int first = std::max(0, (r.top() / lineHeight) - headerCount);  // because all lines are moved down by header
    const int last = (r.bottom()  + lineHeight - 1) / lineHeight;  // round up for fractional line
    const int count = (last - first) + 1;

    m_renderer->render(&painter, firstVisible + first, count, firstVisible);