Checks whether the specified element should have its character indices
        updated as part of real-time updating.

def _update_char_check(self, element, target, docdelta):
        """Checks whether the specified element should have its character indices
        updated as part of real-time updating."""
        if docdelta != 0:
            if (element.docstart <= target and 
                element.docend >= target - docdelta):
                return True
            else:
                return element.absstart > target
        else:
            return element.absstart > target