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diff --git a/sw/source/core/inc/ptqueue.hxx b/sw/source/core/inc/ptqueue.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 .
+ */
+#ifndef INCLUDED_SW_SOURCE_CORE_INC_PTQUEUE_HXX
+#define INCLUDED_SW_SOURCE_CORE_INC_PTQUEUE_HXX
+
+/**
+ * Unfortunately we have some problems with processing more than one Paint()
+ * at a time. This happens especially often during printing.
+ *
+ * SwRootFrame::PaintSwFrame() determines that it's called a second time and adds the
+ * rectangle and the corresponding Shell to the PaintCollector.
+ * The call sites that are causing the double Paint() only need to process the
+ * collected Paint()s at the right point in time.
+ * Doing this during printing (after having printed one page) is very suitable
+ * for doing that.
+ *
+ * Invalidating windows directly from the RootFrame::PaintSwFrame was not a successful
+ * approach, because the Paint()s arrive at a very unfavourable point in time.
+ * Triggering an update for all windows after printing each page does not seem
+ * appropriate either: on the one hand we don't have direct access to the edit
+ * windows and on the other hand the updates can become very costly on some
+ * platforms.
+ */
+
+class SwQueuedPaint;
+class SwViewShell;
+class SwRect;
+
+class SwPaintQueue
+{
+public:
+    static SwQueuedPaint* s_pPaintQueue;
+
+    static void Add(SwViewShell* pSh, const SwRect& rNew);
+    static void Remove(SwViewShell const* pSh);
+    static void Repaint();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */