I’m trying to handle the event of when my ChartManager (QWidget) is destroyed (i.e. when it’s closed). But the signal isn’t emitted at all (i dont get the debug output)

//Mainwindow.cpp
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), m_ui(new Ui::MainWindow),
      . . . 
      m_chartManager(new ChartManager(nullptr)) {
      . . . 
  connect(m_chartManager, &QObject::destroyed, this, [this]() {
    qDebug() << "ChartManager destroyed";
    m_isChartVisible = false;
    m_toolbar->actionShowCharts->setEnabled(false);
  });
     . . . 
//Chartmanager.h
 . . . 
class ChartManager : public QWidget {
  Q_OBJECT
public:
 . . . 

setting it to .. new ChartManager(this), embodies the chart manager window into mainwindow itself
which is not what i want…
I tried chaning to QObject