Returns a list of lines that have breakpoints for this edit.
        
        :return     [<int>, ..]

def breakpoints( self ):
        """
        Returns a list of lines that have breakpoints for this edit.
        
        :return     [<int>, ..]
        """
        lines = []
        result = self.markerFindNext(0, self._breakpointMarker + 1)
        while ( result != -1 ):
            lines.append(result)
            result = self.markerFindNext(result + 1, self._breakpointMarker + 1)
        return lines