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diff --git a/sw/inc/HandleAnchorNodeChg.hxx b/sw/inc/HandleAnchorNodeChg.hxx
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+++ b/sw/inc/HandleAnchorNodeChg.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 "pam.hxx"
+#include <wrtsh.hxx>
+
+class SwFlyFrameFormat;
+class SwFormatAnchor;
+class SwFlyFrame;
+
+// helper class to track change of anchor node of at-paragraph respectively
+// at-character anchored fly frames
+// if such a change happens, it has to be checked, if the count of the anchor
+// frames also change. if yes, a re-creation of the fly frames is needed:
+// - deletion of existing fly frames before the intrinsic anchor node changes
+// - creation of new fly frames after the intrinsic anchor node change.
+class SwHandleAnchorNodeChg
+{
+public:
+    /** checks, if re-creation of fly frames for an anchor node change at the
+        given fly frame format is necessary, and performs the first part.
+
+        @param _rFlyFrameFormat
+        reference to the fly frame format instance, which is handled.
+
+        @param _rNewAnchorFormat
+        new anchor attribute, which will be applied at the given fly frame format
+
+        @param _pKeepThisFlyFrame
+        optional parameter - pointer to a fly frame of the given fly frame format,
+        which isn't deleted, if re-creation of fly frames is necessary.
+    */
+    SwHandleAnchorNodeChg(SwFlyFrameFormat& _rFlyFrameFormat,
+                          const SwFormatAnchor& _rNewAnchorFormat,
+                          SwFlyFrame const* _pKeepThisFlyFrame = nullptr);
+
+    /** calls <SwFlyFrameFormat::MakeFrames>, if re-creation of fly frames is necessary. */
+    ~SwHandleAnchorNodeChg();
+
+private:
+    // fly frame format, which is tracked for an anchor node change.
+    SwFlyFrameFormat& mrFlyFrameFormat;
+    // internal flag, which indicates that the certain anchor node change occurs
+    // and that re-creation of fly frames is necessary.
+    bool mbAnchorNodeChanged;
+
+    /// If the fly frame has a comment, this points to the old comment anchor.
+    std::optional<SwPosition> moCommentAnchor;
+
+    SwWrtShell* mpWrtShell;
+
+    void ImplDestroy();
+
+    SwHandleAnchorNodeChg(const SwHandleAnchorNodeChg&) = delete;
+    void operator=(const SwHandleAnchorNodeChg) = delete;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */