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diff --git a/vcl/inc/unx/saldata.hxx b/vcl/inc/unx/saldata.hxx
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+++ b/vcl/inc/unx/saldata.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_VCL_INC_UNX_SALDATA_HXX
+#define INCLUDED_VCL_INC_UNX_SALDATA_HXX
+
+#include <X11/Xlib.h>
+
+#include <unx/saldisp.hxx>
+#include <unx/gendata.hxx>
+#include <vclpluginapi.h>
+
+class SalXLib;
+class SalDisplay;
+class SalPrinter;
+
+class X11SalData final : public GenericUnixSalData
+{
+    struct XErrorStackEntry
+    {
+        bool            m_bIgnore;
+        bool            m_bWas;
+        XErrorHandler   m_aHandler;
+    };
+    std::vector< XErrorStackEntry > m_aXErrorHandlerStack;
+    XIOErrorHandler m_aOrigXIOErrorHandler;
+
+    std::unique_ptr<SalXLib>  pXLib_;
+
+public:
+    X11SalData();
+    virtual ~X11SalData() override;
+
+    virtual void            Init();
+    virtual void            Dispose() override;
+
+    void                    DeleteDisplay(); // for shutdown
+
+    SalXLib*                GetLib() const { return pXLib_.get(); }
+
+    static void             Timeout();
+
+    // X errors
+    virtual void            ErrorTrapPush() override;
+    virtual bool            ErrorTrapPop( bool bIgnoreError = true ) override;
+    void                    XError( Display *pDisp, XErrorEvent *pEvent );
+    bool                    HasXErrorOccurred() const
+                                { return m_aXErrorHandlerStack.back().m_bWas; }
+    void                    ResetXErrorOccurred()
+                                { m_aXErrorHandlerStack.back().m_bWas = false; }
+    void                    PushXErrorLevel( bool bIgnore );
+    void                    PopXErrorLevel();
+};
+
+X11SalData* GetX11SalData();
+
+#endif // INCLUDED_VCL_INC_UNX_SALDATA_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */