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diff --git a/src/quicktemplates/qquickcombobox_p.h b/src/quicktemplates/qquickcombobox_p.h
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+++ b/src/quicktemplates/qquickcombobox_p.h
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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQUICKCOMBOBOX_P_H
+#define QQUICKCOMBOBOX_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include <QtCore/qloggingcategory.h>
+#include <QtQmlModels/private/qtqmlmodels-config_p.h>
+#include <QtQuickTemplates2/private/qquickcontrol_p.h>
+
+QT_REQUIRE_CONFIG(qml_delegate_model);
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcItemManagement)
+
+class QValidator;
+class QQuickPopup;
+class QQmlInstanceModel;
+class QQuickComboBoxPrivate;
+
+class Q_QUICKTEMPLATES2_EXPORT QQuickComboBox : public QQuickControl
+{
+    Q_OBJECT
+    Q_PROPERTY(int count READ count NOTIFY countChanged FINAL)
+    Q_PROPERTY(QVariant model READ model WRITE setModel NOTIFY modelChanged FINAL)
+    Q_PROPERTY(QQmlInstanceModel *delegateModel READ delegateModel NOTIFY delegateModelChanged FINAL)
+    Q_PROPERTY(bool pressed READ isPressed NOTIFY pressedChanged FINAL)
+    Q_PROPERTY(int highlightedIndex READ highlightedIndex NOTIFY highlightedIndexChanged FINAL)
+    Q_PROPERTY(int currentIndex READ currentIndex WRITE setCurrentIndex NOTIFY currentIndexChanged FINAL)
+    Q_PROPERTY(QString currentText READ currentText NOTIFY currentTextChanged FINAL)
+    Q_PROPERTY(QString displayText READ displayText WRITE setDisplayText RESET resetDisplayText NOTIFY displayTextChanged FINAL)
+    Q_PROPERTY(QString textRole READ textRole WRITE setTextRole NOTIFY textRoleChanged FINAL)
+    Q_PROPERTY(QQmlComponent *delegate READ delegate WRITE setDelegate NOTIFY delegateChanged FINAL)
+    Q_PROPERTY(QQuickItem *indicator READ indicator WRITE setIndicator NOTIFY indicatorChanged FINAL)
+    Q_PROPERTY(QQuickPopup *popup READ popup WRITE setPopup NOTIFY popupChanged FINAL)
+    // 2.1 (Qt 5.8)
+    Q_PROPERTY(bool flat READ isFlat WRITE setFlat NOTIFY flatChanged FINAL REVISION(2, 1))
+    // 2.2 (Qt 5.9)
+    Q_PROPERTY(bool down READ isDown WRITE setDown RESET resetDown NOTIFY downChanged FINAL REVISION(2, 2))
+    Q_PROPERTY(bool editable READ isEditable WRITE setEditable NOTIFY editableChanged FINAL REVISION(2, 2))
+    Q_PROPERTY(QString editText READ editText WRITE setEditText RESET resetEditText NOTIFY editTextChanged FINAL REVISION(2, 2))
+#if QT_CONFIG(validator)
+    Q_PROPERTY(QValidator *validator READ validator WRITE setValidator NOTIFY validatorChanged FINAL REVISION(2, 2))
+#endif
+    Q_PROPERTY(Qt::InputMethodHints inputMethodHints READ inputMethodHints WRITE setInputMethodHints NOTIFY inputMethodHintsChanged FINAL REVISION(2, 2))
+    Q_PROPERTY(bool inputMethodComposing READ isInputMethodComposing NOTIFY inputMethodComposingChanged FINAL REVISION(2, 2))
+    Q_PROPERTY(bool acceptableInput READ hasAcceptableInput NOTIFY acceptableInputChanged FINAL REVISION(2, 2))
+    // 2.5 (Qt 5.12)
+    Q_PROPERTY(qreal implicitIndicatorWidth READ implicitIndicatorWidth NOTIFY implicitIndicatorWidthChanged FINAL REVISION(2, 5))
+    Q_PROPERTY(qreal implicitIndicatorHeight READ implicitIndicatorHeight NOTIFY implicitIndicatorHeightChanged FINAL REVISION(2, 5))
+    Q_CLASSINFO("DeferredPropertyNames", "background,contentItem,indicator,popup")
+    // 2.14 (Qt 5.14)
+    Q_PROPERTY(QVariant currentValue READ currentValue NOTIFY currentValueChanged FINAL REVISION(2, 14))
+    Q_PROPERTY(QString valueRole READ valueRole WRITE setValueRole NOTIFY valueRoleChanged FINAL REVISION(2, 14))
+    // 2.15 (Qt 5.15)
+    Q_PROPERTY(bool selectTextByMouse READ selectTextByMouse WRITE setSelectTextByMouse NOTIFY selectTextByMouseChanged FINAL REVISION(2, 15))
+    // 6.0 (Qt 6.0)
+    Q_PROPERTY(ImplicitContentWidthPolicy implicitContentWidthPolicy READ implicitContentWidthPolicy
+        WRITE setImplicitContentWidthPolicy NOTIFY implicitContentWidthPolicyChanged FINAL REVISION(6, 0))
+    QML_NAMED_ELEMENT(ComboBox)
+    QML_ADDED_IN_VERSION(2, 0)
+
+public:
+    explicit QQuickComboBox(QQuickItem *parent = nullptr);
+    ~QQuickComboBox();
+
+    int count() const;
+
+    QVariant model() const;
+    void setModel(const QVariant &model);
+    QQmlInstanceModel *delegateModel() const;
+
+    bool isPressed() const;
+    void setPressed(bool pressed);
+
+    int highlightedIndex() const;
+
+    int currentIndex() const;
+    void setCurrentIndex(int index);
+
+    QString currentText() const;
+
+    QString displayText() const;
+    void setDisplayText(const QString &text);
+    void resetDisplayText();
+
+    QString textRole() const;
+    void setTextRole(const QString &role);
+
+    QString valueRole() const;
+    void setValueRole(const QString &role);
+
+    QQmlComponent *delegate() const;
+    void setDelegate(QQmlComponent *delegate);
+
+    QQuickItem *indicator() const;
+    void setIndicator(QQuickItem *indicator);
+
+    QQuickPopup *popup() const;
+    void setPopup(QQuickPopup *popup);
+
+    Q_INVOKABLE QString textAt(int index) const;
+    Q_INVOKABLE int find(const QString &text, Qt::MatchFlags flags = Qt::MatchExactly) const;
+
+    // 2.1 (Qt 5.8)
+    bool isFlat() const;
+    void setFlat(bool flat);
+
+    // 2.2 (Qt 5.9)
+    bool isDown() const;
+    void setDown(bool down);
+    void resetDown();
+
+    bool isEditable() const;
+    void setEditable(bool editable);
+
+    QString editText() const;
+    void setEditText(const QString &text);
+    void resetEditText();
+
+#if QT_CONFIG(validator)
+    QValidator *validator() const;
+    void setValidator(QValidator *validator);
+#endif
+
+    Qt::InputMethodHints inputMethodHints() const;
+    void setInputMethodHints(Qt::InputMethodHints hints);
+
+    bool isInputMethodComposing() const;
+    bool hasAcceptableInput() const;
+
+    // 2.5 (Qt 5.12)
+    qreal implicitIndicatorWidth() const;
+    qreal implicitIndicatorHeight() const;
+
+    // 2.14 (Qt 5.14)
+    QVariant currentValue() const;
+    Q_REVISION(2, 14) Q_INVOKABLE QVariant valueAt(int index) const;
+    Q_REVISION(2, 14) Q_INVOKABLE int indexOfValue(const QVariant &value) const;
+
+    // 2.15 (Qt 5.15)
+    bool selectTextByMouse() const;
+    void setSelectTextByMouse(bool canSelect);
+
+    // 6.0 (Qt 6.0)
+    enum ImplicitContentWidthPolicy {
+        ContentItemImplicitWidth,
+        WidestText,
+        WidestTextWhenCompleted
+    };
+    Q_ENUM(ImplicitContentWidthPolicy)
+
+    ImplicitContentWidthPolicy implicitContentWidthPolicy() const;
+    void setImplicitContentWidthPolicy(ImplicitContentWidthPolicy policy);
+
+public Q_SLOTS:
+    void incrementCurrentIndex();
+    void decrementCurrentIndex();
+    Q_REVISION(2, 2) void selectAll();
+
+Q_SIGNALS:
+    void activated(int index);
+    void highlighted(int index);
+    void countChanged();
+    void modelChanged();
+    void delegateModelChanged();
+    void pressedChanged();
+    void highlightedIndexChanged();
+    void currentIndexChanged();
+    void currentTextChanged();
+    void displayTextChanged();
+    void textRoleChanged();
+    void delegateChanged();
+    void indicatorChanged();
+    void popupChanged();
+    // 2.1 (Qt 5.8)
+    Q_REVISION(2, 1) void flatChanged();
+    // 2.2 (Qt 5.9)
+    Q_REVISION(2, 2) void accepted();
+    Q_REVISION(2, 2) void downChanged();
+    Q_REVISION(2, 2) void editableChanged();
+    Q_REVISION(2, 2) void editTextChanged();
+#if QT_CONFIG(validator)
+    Q_REVISION(2, 2) void validatorChanged();
+#endif
+    Q_REVISION(2, 2) void inputMethodHintsChanged();
+    Q_REVISION(2, 2) void inputMethodComposingChanged();
+    Q_REVISION(2, 2) void acceptableInputChanged();
+    // 2.5 (Qt 5.12)
+    Q_REVISION(2, 5) void implicitIndicatorWidthChanged();
+    Q_REVISION(2, 5) void implicitIndicatorHeightChanged();
+    // 2.14 (Qt 5.14)
+    Q_REVISION(2, 14) void valueRoleChanged();
+    Q_REVISION(2, 14) void currentValueChanged();
+    // 2.15 (Qt 5.15)
+    Q_REVISION(2, 15) void selectTextByMouseChanged();
+    // 6.0 (Qt 6.0)
+    Q_REVISION(6, 0) void implicitContentWidthPolicyChanged();
+
+protected:
+    bool eventFilter(QObject *object, QEvent *event) override;
+    void focusInEvent(QFocusEvent *event) override;
+    void focusOutEvent(QFocusEvent *event) override;
+#if QT_CONFIG(im)
+    void inputMethodEvent(QInputMethodEvent *event) override;
+#endif
+    void keyPressEvent(QKeyEvent *event) override;
+    void keyReleaseEvent(QKeyEvent *event) override;
+#if QT_CONFIG(wheelevent)
+    void wheelEvent(QWheelEvent *event) override;
+#endif
+    bool event(QEvent *e) override;
+
+    void componentComplete() override;
+    void itemChange(ItemChange change, const ItemChangeData &value) override;
+    void fontChange(const QFont &newFont, const QFont &oldFont) override;
+    void contentItemChange(QQuickItem *newItem, QQuickItem *oldItem) override;
+    void localeChange(const QLocale &newLocale, const QLocale &oldLocale) override;
+
+    QFont defaultFont() const override;
+
+#if QT_CONFIG(accessibility)
+    QAccessible::Role accessibleRole() const override;
+    void accessibilityActiveChanged(bool active) override;
+#endif
+
+private:
+    Q_DISABLE_COPY(QQuickComboBox)
+    Q_DECLARE_PRIVATE(QQuickComboBox)
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKCOMBOBOX_P_H