137 

   137 

   138     def checkpair(c, f2, man):

   138     def checkpair(c, f2, man):

   139         ''' check if an apparent pair actually matches '''

   139         ''' check if an apparent pair actually matches '''

   140         c2 = ctx(f2, man[f2])

   140         c2 = ctx(f2, man[f2])

   141         ca = c.ancestor(c2)

   141         ca = c.ancestor(c2)

   142         if ca and ca.path() == c.path() or ca.path() == c2.path():

   144         if ca and ca.path() == c.path() or ca.path() == c2.path():

   143             copy[c.path()] = f2

   145             copy[c.path()] = f2

   144             copy[f2] = c.path()

   146             copy[f2] = c.path()

   145 

   147 

   146     for f in u1:

   148     for f in u1: