### Eclipse Workspace Patch 1.0
#P org.eclipse.compare.tests
Index: src/org/eclipse/compare/tests/DocLineComparatorTest.java
===================================================================
RCS file: /cvsroot/eclipse/org.eclipse.compare.tests/src/org/eclipse/compare/tests/DocLineComparatorTest.java,v
retrieving revision 1.4
diff -u -r1.4 DocLineComparatorTest.java
--- src/org/eclipse/compare/tests/DocLineComparatorTest.java	16 Mar 2007 20:25:10 -0000	1.4
+++ src/org/eclipse/compare/tests/DocLineComparatorTest.java	24 Dec 2008 11:47:08 -0000
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * 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
@@ -17,6 +17,7 @@
 import org.eclipse.compare.rangedifferencer.IRangeComparator;
 import org.eclipse.jface.text.Document;
 import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.Region;
 
 public class DocLineComparatorTest extends TestCase {
 	
@@ -70,4 +71,15 @@
 
 		Assert.assertTrue(comp1.rangesEqual(0, comp2, 0));
 	}
+	
+	public void testBug259422() {
+		IDocument doc= new Document();
+		doc.set(""); //$NON-NLS-1$
+		
+		IRangeComparator comp1= new DocLineComparator(doc, null, true);
+		IRangeComparator comp2= new DocLineComparator(doc, new Region(0, doc.getLength()), true);
+
+		Assert.assertTrue(comp1.rangesEqual(0, comp2, 0));
+		
+	}
 }