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/content/ListContainerExecutor.java
protected IReportItemExecutor currentRunIn = null;
		protected IReportItemExecutor executor = null;
		protected IContent content = null;
		protected IReportItemExecutor childExecutor = null;
		protected IContent childContent = null;
		protected boolean hasNext = false;
		protected boolean needUpdate = true;
		
		public ExecutorList(IReportItemExecutor executor, IContent content)
		{
			this.content = content;
			this.executor = executor;
		}
		
		public void close( )
		{
			if(currentRunIn!=null)
			{
				currentRunIn.close( );
			}
			executor.close( );
		}
		public IContent execute( )
		{
			return content;
		}
		public IReportItemExecutor getNextChild( )
		{
			if(childContent!=null)
			{