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
public void endGroup( IGroupContent groupContent )
	{
		assert ( !groupStack.isEmpty( ) );
		groupStack.pop( );
	}
	private int getGroupLevel( )
	{
		if ( !groupStack.isEmpty( ) )
		{
			return ( (Integer) groupStack.peek( ) ).intValue( );
		}
		return -1;
	}
	/**
	 * start row update content cache
	 * 
	 * @param row
	 */
	public void startRow( IRowContent row )
	{
		currentRowID++;
		CellWrapper[] newRowContent = new CellWrapper[columnNumber];
		if ( currentRowID > 0 )
		{
			for ( int i = 0; i < columnNumber; i++ )
			{
				if ( currentRowContent[i] != null )
				{
					int rowSpan = currentRowContent[i].rowSpan;
					if ( rowSpan > 0