code: def _subtitlesRemoved(self, path, subNos):
          
          def action(current, count, model, row):
              if count.equal > 0:
                  model.removeRow(row)
              else:
                  _setSubNo(current - count.greater_equal, model, row)
  
          def count(current, nos):
              return _GtEqCount(current, nos)
  
          self._changeSubNos(path, subNos, count, action)
docs: When subtitle is removed, all syncPoints greater than removed
          subtitle are decremented. SyncPoint equal to removed subtitle is also
          removed.