buffer.addFoldListener(foldHandler);
	public void addNotify()	{		super.addNotify();		ToolTipManager.sharedInstance().registerComponent(painter);		ToolTipManager.sharedInstance().registerComponent(gutter);		if(!documentHandlerInstalled)		{			documentHandlerInstalled = true;			buffer.addDocumentListener(documentHandler);		}		recalculateVisibleLines();	}