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diff --git a/sd/source/ui/sidebar/NavigatorWrapper.hxx b/sd/source/ui/sidebar/NavigatorWrapper.hxx
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+++ b/sd/source/ui/sidebar/NavigatorWrapper.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <sfx2/sidebar/ILayoutableWindow.hxx>
+#include <navigatr.hxx>
+
+class SfxBindings;
+namespace sd { class ViewShellBase; }
+
+namespace sd::sidebar {
+
+/** Present the navigator as control that can be displayed inside the
+    sidebar.
+    This wrapper has two main responsibilities:
+    - Watch for document changes and update the navigator when one
+    happens.
+    - Forward size changes from sidebar to navigator.
+*/
+class NavigatorWrapper
+    : public SdNavigatorWin,
+      public sfx2::sidebar::ILayoutableWindow
+{
+public:
+    NavigatorWrapper (
+        weld::Widget* pParent,
+        sd::ViewShellBase& rViewShellBase,
+        SfxBindings* pBindings);
+
+    // From ILayoutableWindow
+    virtual css::ui::LayoutSize GetHeightForWidth (const sal_Int32 nWidth) override;
+
+private:
+    ViewShellBase& mrViewShellBase;
+
+    void UpdateNavigator();
+};
+
+} // end of namespace sd::sidebar
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */