mainwindow.h

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include "document.h"

#include <QMainWindow>
#include <QString>

QT_BEGIN_NAMESPACE
namespace Ui {
class MainWindow;
}
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);