Bug 201042 [Accessibility]Chart scritp should not add by auto when click the down in keyboard[17]
Description: Chart scritp should not add by auto when click the down in keyboard[0704] Step: 1. New a chart and switch to script view. 2. Let the point on the script function selection. 3. Click the down on keyboard. Actual result: A function will add by auto. Expected result: Customer can not select the function under the second function by keyboard, and it should not be added by auto.
UI/org.eclipse.birt.report.designer.ui.editors.schematic/src/org/eclipse/birt/report/designer/internal/ui/editors/script/JSEditor.java
* Sets the status of the text listener.
	 * 
	 * @param enabled
	 *            <code>true</code> if enable, <code>false</code> otherwise.
	 */
	private void setTextListenerEnable( boolean enabled )
	{
		isTextListenerEnable = enabled;
	}
	/**
	 * Get current edit element, not report design model.
	 * 
	 * @return
	 */
	public Object getModel( )
	{
		
		return editObject;
	}
	private void updateAnnotationLabel( Object handle )
	{
		String name = ProviderFactory.createProvider( handle )
				.getNodeDisplayName( handle );
		if ( name == null )
		{
			ano.setText( "" ); 
		}
		else
		{
			ano.setText( name );