Bug 176467 Wrong page break effect for spanned cell
When page break occurs on spanned cell, this cell on next page is lost, which cause incorrect page layout. Report design to reproduce the error is attached.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/cache/TableAreaLayout.java
{
		return cell != null && cell.getRowSpan( ) < 0;
	}
	
	protected void mergeDropCell(RowArea row)
	{
		if(unresolvedRow==null )
		{
			return;
		}
		CellArea[] cells = new CellArea[columnNumber];
		Iterator iter = row.getChildren( );
		while(iter.hasNext( ))
		{
			CellArea cell = (CellArea)iter.next( );
			int colStart = cell.getColumnID( );
			int colEnd = colStart + cell.getColSpan( );
			for(int i=colStart; i<colEnd; i++)
			{
				int index = colStart - start;
				if(index>=0 && index<columnNumber)
				{
					cells[colStart-start] = cell;
				}
			}
		}
		
		for(int i=0; i<columnNumber; i++)
		{
			if(cells[i]==null)