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/pdf/PDFTableLM.java
* @param cellArea
	 */
	public void resolveBorderConflict( CellArea cellArea )
	{
		IContent cellContent = cellArea.getContent( );
		int columnID = cellArea.getColumnID( );
		int rowID = cellArea.getRowID( );
		int colSpan = cellArea.getColSpan( );
		IRowContent row = (IRowContent) cellContent.getParent( );
		IStyle cellContentStyle = cellContent.getComputedStyle( );
		IStyle cellAreaStyle = cellArea.getStyle( );
		IStyle tableStyle = tableContent.getComputedStyle( );
		IStyle rowStyle = row.getComputedStyle( );
		IStyle columnStyle = getColumnStyle( columnID );
		IStyle preRowStyle = null;
		IStyle preColumnStyle = getColumnStyle( columnID - 1 );
		IStyle leftCellContentStyle = null;
		IStyle topCellStyle = null;
		if ( rowID == currentRowID-1 )
		{
			if ( columnID > 0 && currentRowContent[columnID - 1] != null )
			{
				leftCellContentStyle = currentRowContent[columnID - 1].cell
						.getComputedStyle( );
			}
			if ( lastRow != null )
			{
				preRowStyle = lastRow.row.getComputedStyle( );
				if ( lastRowContent[columnID] != null )
				{