Bug 152560 PDF doesn't display bottom Border in inner group footer properly
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTableLM.java
int delta = (colSum - maxWidth)/columnNumber;
					assert(delta>=0);
					for ( int i = 0; i < columnNumber; i++ )
					{
						columns[i] -= delta;
					}
					return columns;
				}
			}
			else
			{
				if(specifiedWidth==0)
				{
					if(colSum<maxWidth)
					{
						int colNumber = columnNumber - columnWithWidth;
						int aw = (maxWidth - colSum)/colNumber;
						distributeWidth( columns, colNumber, aw);
					}
					else
					{
						distributeWidth(columns, columnNumber, maxWidth/columnNumber);
					}
				}
				else
				{
					if(colSum<specifiedWidth)
					{
						int colNumber = columnNumber - columnWithWidth;
						int aw = (specifiedWidth - colSum)/colNumber;