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/HTMLTableBandLM.java
IElement pContent = tableBand.getParent( );
		if ( pContent instanceof IGroupContent )
		{
			IGroupContent group = (IGroupContent) pContent;
			groupLevel = group.getGroupLevel( );
		}
		dropDetailResolved = false;
	}
	protected boolean layoutChildren( )
	{
		if ( bandType == IBandContent.BAND_GROUP_FOOTER )
		{
			if ( !dropDetailResolved )
			{
				tbl.updateDropCells( groupLevel, false );
				dropDetailResolved = false;
			}
		}
		boolean hasNext = super.layoutChildren( );
		if ( !hasNext )
		{
			if ( bandType == IBandContent.BAND_GROUP_FOOTER )
			{
				tbl.updateDropCells( groupLevel, true );
			}
		}
		return hasNext;
	}
}