at the table bottom use this row as it is the only place where we dont paint above the row, bug 254538 r/sr=bzbarsky

layout/html/table/src/nsTableFrame.cpp

@@ -7006,7 +7006,7 @@ nsTableFrame::PaintBCBorders(nsPresContext*      aPresContext,
             break;
           case eAjaRowOwner: 
             side = NS_SIDE_BOTTOM;
-            row = iter.prevRow; // and fall through
+            row = (iter.IsBottomMostTable()) ? iter.row : iter.prevRow; // and fall through
           case eRowOwner:
             if (row) {
               ::GetStyleInfo(*row, side, style, color, iter.IsBottomMostTable());

layout/tables/nsTableFrame.cpp

@@ -7006,7 +7006,7 @@ nsTableFrame::PaintBCBorders(nsPresContext*      aPresContext,
             break;
           case eAjaRowOwner: 
             side = NS_SIDE_BOTTOM;
-            row = iter.prevRow; // and fall through
+            row = (iter.IsBottomMostTable()) ? iter.row : iter.prevRow; // and fall through
           case eRowOwner:
             if (row) {
               ::GetStyleInfo(*row, side, style, color, iter.IsBottomMostTable());