diff -r 1f650edec019 openide.text/test/unit/src/org/openide/text/CloneableEditorDocumentGCTest.java
--- a/openide.text/test/unit/src/org/openide/text/CloneableEditorDocumentGCTest.java	Thu Oct 15 12:11:32 2009 +0200
+++ b/openide.text/test/unit/src/org/openide/text/CloneableEditorDocumentGCTest.java	Fri Oct 16 15:56:40 2009 +0200
@@ -55,7 +55,9 @@
 import java.util.Date;
 import java.util.List;
 import javax.swing.text.Document;
+import javax.swing.text.EditorKit;
 import org.netbeans.junit.NbTestCase;
+import org.openide.text.Line.Set;
 import org.openide.util.Exceptions;
 import org.openide.util.Lookup;
 import org.openide.windows.CloneableOpenSupport;
@@ -92,6 +94,7 @@
 
     private static final Object LOCK = new Object();
     private boolean waiting;
+    private boolean isNbLikeEditorKit;
     
     public CloneableEditorDocumentGCTest(String s) {
         super(s);
@@ -158,6 +161,11 @@
             LOCK.notifyAll();
         }
     }
+
+    public void testDocumentGCedOnNbLike () throws Exception {
+        isNbLikeEditorKit = true;
+        testDocumentGCed();
+    }
     
     //
     // Implementation of the CloneableEditorSupport.Env
@@ -240,6 +248,16 @@
         public CES (Env env, Lookup l) {
             super (env, l);
         }
+
+        protected @Override EditorKit createEditorKit() {
+            EditorKit retValue;
+            if (isNbLikeEditorKit) {
+                retValue = new NbLikeEditorKit();
+            } else {
+                retValue = super.createEditorKit();
+            }
+            return retValue;
+        }
         
         public CloneableTopComponent.Ref getRef () {
             return allEditors;