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/pdf/PDFAbstractLM.java
{
		IReportExecutor executor;
		public ReportStackingExecutor( IReportExecutor executor )
		{
			this.executor = executor;
		}
		public void close( )
		{
			executor.close( );
		}
		public IContent execute( )
		{
			return null;
		}
		public IReportItemExecutor getNextChild( )
		{
			return executor.getNextChild( );
		}
		public boolean hasNextChild( )
		{
			return executor.hasNextChild( );
		}
	}
	protected boolean checkAvailableSpace( )
	{
		if ( parent != null )
		{
			int leftHeight = parent.getMaxAvaHeight( ) - parent.getCurrentBP( );