Bug 206603 Table column is not rendered in pdf if its width is set in ems
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTableLM.java
return height;
	}
	protected int getGroupLevel( )
	{
		if ( !groupStack.isEmpty( ) )
		{
			return ( (Integer) groupStack.peek( ) ).intValue( );
		}
		return -1;
	}
	private int createDropID( int groupIndex, String dropType )
	{
		int dropId = -10 * ( groupIndex + 1 );
		if ( "all".equals( dropType ) ) 
		{
			dropId--;
		}
		return dropId;
	}
	/**
	 * start cell update content cache
	 * 
	 * @param cell
	 */
	public int getRowSpan( ICellContent cell )
	{
		int groupLevel = getGroupLevel( );
		int rowSpan = cell.getRowSpan( );
		if ( groupLevel >= 0 )
		{