Better document some of the code in RowPainter. Added a check in table-cell_number-rows-spanned_bug38397.xml which is the reason for one of the if-branches in RowPainter. It wan't tested previously so that if-branch could easily be mistaken to be useless.
xmlgraphics/fop/trunk/src/java/org/apache/fop/layoutmgr/table/RowPainter.java