Bug 204245 Blank column on visibility column in excel[0300]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/buffermgr/TableContentLayout.java
for ( int j = colId; j < lastColId; j++ )
			{
				cells[j] = Cell.EMPTY_CELL;
			}
		}
	}
	/**
	 * we never change both the row span and col span at the same time.
	 * 
	 * @param cell
	 *            the cell to be changed
	 * @param newRowSpan
	 *            new row span
	 * @param newColSpan
	 *            new col span
	 */
	protected void resizeCell( Cell cell, int newRowSpan, int newColSpan )
	{
		assert cell.status == Cell.CELL_USED;
		int rowId = cell.rowId;
		int colId = cell.colId;
		int rowSpan = cell.rowSpan;
		if ( rowSpan <= 0 )
		{
			rowSpan = rowCount - rowId;
		}
		int colSpan = cell.colSpan;
		assert rowSpan >= newRowSpan && colSpan >= newColSpan;
		fillEmptyCells( rowId, colId + newColSpan, rowSpan, colSpan
				- newColSpan );