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diff --git a/include/vcl/i18nhelp.hxx b/include/vcl/i18nhelp.hxx
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+++ b/include/vcl/i18nhelp.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_I18NHELP_HXX
+#define INCLUDED_VCL_I18NHELP_HXX
+
+#include <com/sun/star/uno/Reference.h>
+#include <i18nlangtag/languagetag.hxx>
+#include <mutex>
+#include <rtl/ustring.hxx>
+#include <tools/long.hxx>
+#include <vcl/dllapi.h>
+#include <memory>
+
+namespace com::sun::star::uno {
+    class XComponentContext;
+}
+namespace utl {
+    class TransliterationWrapper;
+}
+class LocaleDataWrapper;
+
+namespace vcl
+{
+
+class VCL_DLLPUBLIC I18nHelper
+{
+    mutable std::mutex              maMutex;
+    LanguageTag                     maLanguageTag;
+    css::uno::Reference< css::uno::XComponentContext > m_xContext;
+
+    std::unique_ptr<LocaleDataWrapper>              mpLocaleDataWrapper;
+    std::unique_ptr<utl::TransliterationWrapper>    mpTransliterationWrapper;
+
+    bool                            mbTransliterateIgnoreCase;
+
+    SAL_DLLPRIVATE void             ImplDestroyWrappers();
+
+    SAL_DLLPRIVATE utl::TransliterationWrapper&    ImplGetTransliterationWrapper() const;
+    SAL_DLLPRIVATE LocaleDataWrapper&              ImplGetLocaleDataWrapper() const;
+
+public:
+
+                I18nHelper( const css::uno::Reference< css::uno::XComponentContext >& rxContext, const LanguageTag& rLanguageTag );
+                ~I18nHelper();
+
+    sal_Int32   CompareString( const OUString& rStr1, const OUString& rStr2 ) const;
+
+    bool    MatchString( const OUString& rStr1, const OUString& rStr2 ) const;
+    bool    MatchMnemonic( std::u16string_view rString, sal_Unicode cMnemonicChar ) const;
+
+    OUString    GetNum( tools::Long nNumber, sal_uInt16 nDecimals, bool bUseThousandSep = true, bool bTrailingZeros = true ) const;
+
+    static OUString filterFormattingChars( const OUString& );
+};
+
+}   // namespace vcl
+
+#endif // INCLUDED_VCL_I18NHELP_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */