message: Fix nullptr connect error
diff: @@ -58,10 +58,6 @@ CachePlotWidget::CachePlotWidget(QWidget* parent) : QWidget(parent), m_ui(new Ui
  m_ui->sizeBreakdownButton->setIcon(sizeBreakdownIcon);
  connect(m_ui->sizeBreakdownButton, &QPushButton::clicked, this, &CachePlotWidget::showSizeBreakdown);
  connect(m_ui->windowed, &QCheckBox::toggled, m_ui->windowCycles, &QWidget::setEnabled);
  - connect(m_ui->windowed, &QCheckBox::toggled, m_mavgMarkerAction, [=](bool enabled) {
  - m_mavgMarkerAction->setChecked(enabled);
  - m_mavgMarkerAction->setEnabled(enabled);
  - });
  connect(m_ui->maxCyclesButton, &QPushButton::clicked, this, [=] {
  QMessageBox::information(
  @@ -196,6 +192,10 @@ void CachePlotWidget::setupPlotActions() {
  m_ui->mavgCursor->setDefaultAction(m_mavgMarkerAction);
  connect(m_mavgMarkerAction, &QAction::toggled, showMarkerFunctor(m_mavgSeries, "Average"));
  m_mavgMarkerAction->setChecked(true);
  + connect(m_ui->windowed, &QCheckBox::toggled, m_mavgMarkerAction, [=](bool enabled) {
  + m_mavgMarkerAction->setChecked(enabled);
  + m_mavgMarkerAction->setEnabled(enabled);
  + });
  const QIcon copyIcon = QIcon(":/icons/documents.svg");
  m_copyDataAction = new QAction("Copy data to clipboard", this);
  