[170026] copying and then pasting text block twice makes file not dirty (restore)

bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/text/BasicStructuredDocument.java

diff --git a/bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/text/BasicStructuredDocument.java b/bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/text/BasicStructuredDocument.java
index 07e95da..d17dec6 100644
--- a/bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/text/BasicStructuredDocument.java
+++ b/bundles/org.eclipse.wst.sse.core/src/org/eclipse/wst/sse/core/internal/text/BasicStructuredDocument.java
@@ -458,8 +458,7 @@
 						((IDocumentListener) holdListeners[i]).documentChanged(NULL_DOCUMENT_EVENT);
 					}
 					else {
-						// disabled for pre-2.0M5 specific assembly
-//						fDocumentEvent.fModificationStamp = getModificationStamp();
+						fDocumentEvent.fModificationStamp = getModificationStamp();
 						((IDocumentListener) holdListeners[i]).documentChanged(fDocumentEvent);
 					}
 				}