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diff --git a/src/plugins/emacskeys/emacskeysstate.cpp b/src/plugins/emacskeys/emacskeysstate.cpp
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+++ b/src/plugins/emacskeys/emacskeysstate.cpp
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+/**************************************************************************
+**
+** Copyright (c) nsf <no.smile.face@gmail.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#include "emacskeysstate.h"
+
+#include <QTextCursor>
+#include <QPlainTextEdit>
+
+using namespace EmacsKeys::Internal;
+
+//---------------------------------------------------------------------------
+// EmacsKeysState
+//---------------------------------------------------------------------------
+
+EmacsKeysState::EmacsKeysState(QPlainTextEdit *edit):
+    m_ignore3rdParty(false),
+    m_mark(-1),
+    m_lastAction(KeysAction3rdParty),
+    m_editorWidget(edit)
+{
+    connect(edit, SIGNAL(cursorPositionChanged()),
+        this, SLOT(cursorPositionChanged()));
+    connect(edit, SIGNAL(textChanged()),
+        this, SLOT(textChanged()));
+    connect(edit, SIGNAL(selectionChanged()),
+        this, SLOT(selectionChanged()));
+}
+
+EmacsKeysState::~EmacsKeysState() {}
+
+void EmacsKeysState::setLastAction(EmacsKeysAction action)
+{
+    if (m_mark != -1) {
+        // this code can be triggered only by 3rd party actions
+        beginOwnAction();
+        QTextCursor cursor = m_editorWidget->textCursor();
+        cursor.clearSelection();
+        m_editorWidget->setTextCursor(cursor);
+        m_mark = -1;
+        endOwnAction(action);
+    } else {
+        m_lastAction = action;
+    }
+}
+
+void EmacsKeysState::cursorPositionChanged() {
+    if (!m_ignore3rdParty)
+        setLastAction(KeysAction3rdParty);
+}
+
+void EmacsKeysState::textChanged() {
+    if (!m_ignore3rdParty)
+        setLastAction(KeysAction3rdParty);
+}
+
+void EmacsKeysState::selectionChanged()
+{
+    if (!m_ignore3rdParty)
+        setLastAction(KeysAction3rdParty);
+}