Bug 315050 [Automation][Regression]Image size is different from golden file when preview as xls
engine/org.eclipse.birt.report.engine.emitter.prototype.excel/src/org/eclipse/birt/report/engine/emitter/excel/layout/ExcelLayoutEngine.java
if ( col == -1 || col >= cache.getColumnCount( ) )
			return;
		int span = axis.getColumnIndexByCoordinate( data.getEndX( ) ) - col;
		
		outputDataIfBufferIsFull( );
		updataRowIndex( data, container );
		addDatatoCache( col, data );
		for ( int i = col + 1; i < col + span; i++ )
		{
			BlankData blankData = new BlankData( data );
			blankData.setType( Type.HORIZONTAL );
			addDatatoCache( i, blankData );
		}
		if ( data.getDataType( ) == SheetData.IMAGE )
		{
			addEmptyData( data, container );
		}
		while ( container != null )
		{
			if ( container instanceof XlsCell )
			{
				XlsCell cell = (XlsCell) container;
				data.setRowSpanInDesign( cell.getRowSpan( ) - 1 );
				break;
			}
			else
			{
				container = container.getParent( );
			}
		}