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diff --git a/src/designer/src/lib/shared/selectsignaldialog_p.h b/src/designer/src/lib/shared/selectsignaldialog_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Designer of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of Qt Designer.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef SELECTSIGNALDIALOG_H
+#define SELECTSIGNALDIALOG_H
+
+#include <QtWidgets/QDialog>
+#include <QtCore/QStringList>
+
+QT_BEGIN_NAMESPACE
+
+class QDesignerFormEditorInterface;
+class QStandardItemModel;
+
+namespace Ui { class SelectSignalDialog; }
+
+namespace qdesigner_internal {
+
+class SelectSignalDialog : public QDialog
+{
+    Q_OBJECT
+public:
+    struct Method
+    {
+        Method() {}
+        explicit Method(const QString &c, const QString &s, const QStringList &p = QStringList())
+            : className(c), signature(s), parameterNames(p) {}
+        bool isValid() const { return !signature.isEmpty(); }
+
+        QString className;
+        QString signature;
+        QStringList parameterNames;
+    };
+
+    explicit SelectSignalDialog(QWidget *parent = nullptr);
+    ~SelectSignalDialog();
+
+    Method selectedMethod() const;
+
+    void populate(QDesignerFormEditorInterface *core, QObject *object, QString defaultSignal);
+
+private slots:
+    void currentChanged(const QModelIndex &, const QModelIndex &);
+    void activated(const QModelIndex &);
+
+private:
+    Method methodFromIndex(const QModelIndex &) const;
+    void populateModel(QDesignerFormEditorInterface *core, QObject *object);
+
+    Ui::SelectSignalDialog *m_ui;
+    QPushButton *m_okButton;
+    QStandardItemModel *m_model;
+};
+
+} // namespace qdesigner_internal
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(qdesigner_internal::SelectSignalDialog::Method)
+
+#endif // SELECTSIGNALDIALOG_H