There is the following code:

linedit ed;
ed.setValidator(new QIntValidator(0,3600,&ed));
qApp->connect(&ed,&linedit::inputRejected,&ed,&linedit::edited);

linedit:

#ifndef LINEDIT_H
#define LINEDIT_H
#include<QLineEdit>
#include<QWidget>

class linedit : public QLineEdit
{
    Q_OBJECT
public:
    linedit(QWidget *parent = nullptr);

public slots:
    bool edited();
};

#endif // LINEDIT_H

edited:

bool linedit::edited(){
    qDebug() << text();
    return 0;
}

Why, when entering, for example, 4000, the inputRejected signal is not generated, but is generated when trying to enter “a” or “10000”