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diff --git a/src/platformsupport/input/xkbcommon/qxkbcommon_p.h b/src/platformsupport/input/xkbcommon/qxkbcommon_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2018 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** 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-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QXKBCOMMON_P_H
+#define QXKBCOMMON_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/QString>
+#include <QtCore/QVector>
+#include <QtCore/QLoggingCategory>
+#include <QtCore/QList>
+
+#include <xkbcommon/xkbcommon.h>
+
+#include <memory>
+
+QT_BEGIN_NAMESPACE
+
+Q_DECLARE_LOGGING_CATEGORY(lcXkbcommon)
+
+class QEvent;
+class QKeyEvent;
+class QPlatformInputContext;
+
+class QXkbCommon
+{
+public:
+    static QString lookupString(struct xkb_state *state, xkb_keycode_t code);
+    static QString lookupStringNoKeysymTransformations(xkb_keysym_t keysym);
+
+    static QVector<xkb_keysym_t> toKeysym(QKeyEvent *event);
+
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers);
+    static int keysymToQtKey(xkb_keysym_t keysym, Qt::KeyboardModifiers modifiers,
+                             xkb_state *state, xkb_keycode_t code,
+                             bool superAsMeta = false, bool hyperAsMeta = false);
+
+    // xkbcommon_* API is part of libxkbcommon internals, with modifications as
+    // desribed in the header of the implementation file.
+    static void xkbcommon_XConvertCase(xkb_keysym_t sym, xkb_keysym_t *lower, xkb_keysym_t *upper);
+    static xkb_keysym_t qxkbcommon_xkb_keysym_to_upper(xkb_keysym_t ks);
+
+    static Qt::KeyboardModifiers modifiers(struct xkb_state *state);
+
+    static QList<int> possibleKeys(xkb_state *state, const QKeyEvent *event,
+                                   bool superAsMeta = false, bool hyperAsMeta = false);
+
+    static void verifyHasLatinLayout(xkb_keymap *keymap);
+    static xkb_keysym_t lookupLatinKeysym(xkb_state *state, xkb_keycode_t keycode);
+
+    static bool isLatin(xkb_keysym_t sym) {
+        return ((sym >= 'a' && sym <= 'z') || (sym >= 'A' && sym <= 'Z'));
+    }
+    static bool isKeypad(xkb_keysym_t sym) {
+        return sym >= XKB_KEY_KP_Space && sym <= XKB_KEY_KP_9;
+    }
+
+    static void setXkbContext(QPlatformInputContext *inputContext, struct xkb_context *context);
+
+    struct XKBStateDeleter {
+        void operator()(struct xkb_state *state) const { return xkb_state_unref(state); }
+    };
+    struct XKBKeymapDeleter {
+        void operator()(struct xkb_keymap *keymap) const { return xkb_keymap_unref(keymap); }
+    };
+    struct XKBContextDeleter {
+        void operator()(struct xkb_context *context) const { return xkb_context_unref(context); }
+    };
+    using ScopedXKBState = std::unique_ptr<struct xkb_state, XKBStateDeleter>;
+    using ScopedXKBKeymap = std::unique_ptr<struct xkb_keymap, XKBKeymapDeleter>;
+    using ScopedXKBContext = std::unique_ptr<struct xkb_context, XKBContextDeleter>;
+};
+
+QT_END_NAMESPACE
+
+#endif // QXKBCOMMON_P_H