Fix indentation undistinguish from the next logical line.

def fix_e125(self, result):
        """Fix indentation undistinguish from the next logical line."""
        num_indent_spaces = int(result['info'].split()[1])
        line_index = result['line'] - 1
        target = self.source[line_index]

        spaces_to_add = num_indent_spaces - len(_get_indentation(target))
        indent = len(_get_indentation(target))
        modified_lines = []

        while len(_get_indentation(self.source[line_index])) >= indent:
            self.source[line_index] = (' ' * spaces_to_add +
                                       self.source[line_index])
            modified_lines.append(1 + line_index)  # Line indexed at 1.
            line_index -= 1

        return modified_lines