Bug 147676 [regression]Visibility set in the first col will affect the second col
Description: Visibility set in the first col will affect the second col Steps to reproduce: 1. Insert a grid(3*3), insert contents to each cell. 2.Set the first col to hide all in visibility and preview Expected result: Only the first col is hidden. Actual result: The second col is hidden, too. If you set the second col in step2, the third col will disappear.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLAbstractLM.java
}
		return false;
	}
	/**
	 * execute the executor, drip all its children contents.
	 * 
	 * @param executor
	 */
	private void traverse( IReportItemExecutor executor )
	{
		assert executor != null;
		while ( executor.hasNextChild( ) )
		{
			IReportItemExecutor child = (IReportItemExecutor) executor
					.getNextChild( );
			if ( child != null )
			{
				child.execute( );
				traverse( child );
				child.close( );
			}
		}
	}
	/**
	 * execute the report and add all its contents into the content.
	 * 
	 * @param content
	 * @param executor
	 */
	protected void execute( IContent content, IReportItemExecutor executor )