if (fDocument != null) {
if (true)
	public void close() {		if (fDocument != null) {			// already closed			return;		}				IDocument d= fDocument;		fDocument= null;		d.removePrenotifiedDocumentListener(this);				fireBufferChanged(new BufferChangedEvent(this, 0, 0, null));		fBufferListeners.clear();		fBufferListeners= null;	}