'Return a list of `(library_name, handler_name)` tuples.'

def _get_all_handler_names(self):

    handlers = [('', printable_name(handler.name, True)) for handler in self.user_keywords.handlers]
    for library in chain(self.libraries.values(), self.resources.values()):
        if (library.name != 'Reserved'):
            handlers.extend((((library.name or ''), printable_name(handler.name, code_style=True)) for handler in library.handlers))
    return sorted(handlers)
