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diff --git a/framework/source/inc/pattern/window.hxx b/framework/source/inc/pattern/window.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_FRAMEWORK_SOURCE_INC_PATTERN_WINDOW_HXX
+#define INCLUDED_FRAMEWORK_SOURCE_INC_PATTERN_WINDOW_HXX
+
+#include <com/sun/star/awt/XWindow.hpp>
+#include <com/sun/star/awt/XTopWindow.hpp>
+
+#include <toolkit/helper/vclunohelper.hxx>
+#include <vcl/window.hxx>
+#include <vcl/svapp.hxx>
+
+// namespaces
+
+namespace framework{
+
+class WindowHelper
+{
+    public:
+
+
+static bool isTopWindow(const css::uno::Reference< css::awt::XWindow >& xWindow)
+{
+    // even child frame containing top level windows (e.g. query designer of database) will be closed
+    css::uno::Reference< css::awt::XTopWindow > xTopWindowCheck(xWindow, css::uno::UNO_QUERY);
+    if (xTopWindowCheck.is())
+    {
+        // Note: Toolkit interface XTopWindow sometimes is used by real VCL-child-windows also .-)
+        // Be sure that these window is really a "top system window".
+        // Attention ! Checking Window->GetParent() is not the right approach here.
+        // Because sometimes VCL create "implicit border windows" as parents even we created
+        // a simple XWindow using the toolkit only .-(
+        SolarMutexGuard aSolarGuard;
+        VclPtr<vcl::Window> pWindow = VCLUnoHelper::GetWindow( xWindow );
+        if ( pWindow && pWindow->IsSystemWindow() )
+            return true;
+    }
+
+    return false;
+}
+
+};
+
+} // namespace framework
+
+#endif // INCLUDED_FRAMEWORK_SOURCE_INC_PATTERN_WINDOW_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */