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diff --git a/tqt/tqextscintilladocument.cpp b/tqt/tqextscintilladocument.cpp
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+++ b/tqt/tqextscintilladocument.cpp
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+// This module implements the TQextScintillaDocument class.
+//
+// Copyright (c) 2006
+// 	Riverbank Computing Limited <info@riverbankcomputing.co.uk>
+// 
+// This file is part of TQScintilla.
+// 
+// This copy of TQScintilla is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2, or (at your option) any
+// later version.
+// 
+// TQScintilla is supplied in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+// details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// TQScintilla; see the file LICENSE.  If not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include "tqextscintilladocument.h"
+#include "tqextscintillabase.h"
+
+
+// This internal class encapsulates the underlying document and is shared by
+// TQextScintillaDocument instances.
+class TQextScintillaDocumentP
+{
+public:
+	TQextScintillaDocumentP() : doc(0), nr_displays(0), nr_attaches(1) {}
+
+	long doc;			// The Scintilla document.
+	int nr_displays;		// The number of displays.
+	int nr_attaches;		// The number of attaches.
+};
+
+
+// The ctor.
+TQextScintillaDocument::TQextScintillaDocument()
+{
+	pdoc = new TQextScintillaDocumentP();
+}
+
+
+// The dtor.
+TQextScintillaDocument::~TQextScintillaDocument()
+{
+	detach();
+}
+
+
+// The copy ctor.
+TQextScintillaDocument::TQextScintillaDocument(const TQextScintillaDocument &that)
+{
+	attach(that);
+}
+
+
+// The assignment operator.
+TQextScintillaDocument &TQextScintillaDocument::operator=(const TQextScintillaDocument &that)
+{
+	if (pdoc != that.pdoc)
+	{
+		detach();
+		attach(that);
+	}
+
+	return *this;
+}
+
+
+// Attach an existing document to this one.
+void TQextScintillaDocument::attach(const TQextScintillaDocument &that)
+{
+	++that.pdoc -> nr_attaches;
+	pdoc = that.pdoc;
+}
+
+
+// Detach the underlying document.
+void TQextScintillaDocument::detach()
+{
+	if (!pdoc)
+		return;
+
+	if (--pdoc -> nr_attaches == 0)
+	{
+		if (pdoc -> doc && pdoc -> nr_displays == 0)
+		{
+			TQextScintillaBase *tqsb = TQextScintillaBase::pool();
+
+			// Release the explicit reference to the document.  If
+			// the pool is empty then we just accept the memory
+			// leak.
+			if (tqsb)
+				tqsb -> SendScintilla(TQextScintillaBase::SCI_RELEASEDOCUMENT,0,pdoc -> doc);
+		}
+
+		delete pdoc;
+	}
+
+	pdoc = 0;
+}
+
+
+// Undisplay and detach the underlying document.
+void TQextScintillaDocument::undisplay(TQextScintillaBase *tqsb)
+{
+	if (--pdoc -> nr_attaches == 0)
+		delete pdoc;
+	else if (--pdoc -> nr_displays == 0)
+	{
+		// Create an explicit reference to the document to keep it
+		// alive.
+		tqsb -> SendScintilla(TQextScintillaBase::SCI_ADDREFDOCUMENT,0,pdoc -> doc);
+	}
+
+	pdoc = 0;
+}
+
+
+// Display the underlying document.
+void TQextScintillaDocument::display(TQextScintillaBase *tqsb,const TQextScintillaDocument *from)
+{
+	long ndoc;
+
+	if (from)
+	{
+		ndoc = from -> pdoc -> doc;
+		tqsb -> SendScintilla(TQextScintillaBase::SCI_SETDOCPOINTER,0,ndoc);
+	}
+	else
+		ndoc = tqsb -> SendScintilla(TQextScintillaBase::SCI_GETDOCPOINTER);
+
+	pdoc -> doc = ndoc;
+	++pdoc -> nr_displays;
+}