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diff --git a/experimental/compensator/org.eclipse.fx.text.ui/src/org/eclipse/jface/text/ITextListener.java b/experimental/compensator/org.eclipse.fx.text.ui/src/org/eclipse/jface/text/ITextListener.java
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+++ b/experimental/compensator/org.eclipse.fx.text.ui/src/org/eclipse/jface/text/ITextListener.java
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+/*******************************************************************************
+ * Copyright (c) 2000, 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jface.text;
+
+
+
+/**
+ * Text listeners registered with a text viewer are informed about all
+ * modifications of an {@link org.eclipse.jface.text.ITextViewer} by means of
+ * text events. A text event describes a change as a replace operation.
+ * <p>
+ * The changes described in the event are the changes applied to the text
+ * viewer's widget (i.e., its visual representation) and not those applied to the
+ * text viewer's document. The text event can be asked to return the
+ * corresponding document event. If the text event does not contain a document
+ * event, the modification of the text viewer is a presentation change. For
+ * example, changing the visible region of a text viewer, is a presentation
+ * change. A completely empty text event represents a change of the viewer's
+ * redraw state.</p>
+ * <p>
+ * If a text listener receives a text event, it is guaranteed that both the
+ * document and the viewer's visual representation are synchronized.</p>
+ * <p>
+ * Clients may implement this interface.</p>
+ *
+ * @see org.eclipse.jface.text.ITextViewer
+ * @see org.eclipse.jface.text.TextEvent
+ * @see org.eclipse.jface.text.DocumentEvent
+ */
+public interface ITextListener {
+
+	/**
+	 * The visual representation of a text viewer this listener is registered with
+	 * has been changed.
+	 *
+	 * @param event the description of the change
+	 */
+	void textChanged(TextEvent event);
+}