work copy

utils.py

@@ -22,6 +22,9 @@ def border_bottom(sh, cell):
 def border_top(sh, cell):
     return border(sh, cell).top_line_style
     
+def has_no_bottom_border(sh, coord):
+    return border_bottom(sh, coord) == 0 and border_top(sh, coord.shift(down=1)) == 0
+
 def parse_all_dirt(sh, min_pos, right, down):
     RET = set()