Dead keys don't generate a keyPressed event on linux

#include <QApplication>
#include <QKeyEvent>
#include <QLineEdit>
#include <QWidget>
#include <QtGui>

class KeyPress : public QWidget
{
    Q_OBJECT
public:
    KeyPress(QWidget *parent = nullptr) : QWidget(parent) { new QLineEdit(this); }

protected:
    void keyPressEvent(QKeyEvent *event) override final
    {
        qDebug() << "press" << event->key() << event->text();
    }
    void keyReleaseEvent(QKeyEvent *event) override final
    {
        qDebug() << "release" << event->key() << event->text();
    }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);    
    KeyPress *keyPress = new KeyPress();
    keyPress->show();
    return a.exec();
}