//cppobj.h
class CppObj : public QObject
{
    Q_OBJECT
    QML_ELEMENT
    QML_SINGLETON

public:
    explicit CppObj(QObject* parent = nullptr) : QObject(parent) {}

    Q_INVOKABLE void spinNestedLoop()
    {
        qDebug("Spinning inner event loop...");

        QEventLoop innerLoop;
        QTimer::singleShot(2000, this, [&]{
            innerLoop.quit();
        });
        innerLoop.exec(); // No nested loop ==> no crash

/*
        // Same outcome if this is used instead of QEventLoop
        int i = 20;
        while (--i >= 0)
        {
            QThread::msleep(100);
            QCoreApplication::processEvents();
        }
*/

        qDebug("...done!");
    }
};

// main.qml
import QtQuick 2.15
import QtQuick.Controls 2.15
import NestedEventsPopCrash 1.0

ApplicationWindow {
    id: window
    width: 640
    height: 480
    visible: true

    header: Button {
        property bool timeToPush: stackView.depth <= 1

        text: timeToPush ? "Push" : "Pop"
        onClicked: {
            if (timeToPush) {
                stackView.push(otherComp)
            } else {
                console.log("Popping...")
                let item = stackView.pop()
                console.log("...Popped!")
            }
        }
    }

    StackView {
        id: stackView
        anchors.fill: parent
        initialItem: Text {
            text: "Click the 'Push' button"
            onVisibleChanged: {
                if (visible)
                    CppObj.spinNestedLoop()
            }
        }
    }

    Component {
        id: otherComp
        Text {
            text: "Click the 'Pop' button to crash"
            Component.onDestruction: console.log(this, "says bye")
        }
    }
}