async def flush(self, request: Request, stacks: List[Stack]):
ns = await self.expand_stacks(request, stacks)<EOL>ns = self.split_stacks(ns)<EOL>ns = self.clean_stacks(ns)<EOL>await self.next(request, [Stack(x) for x in ns])<EOL>
For all stacks to be sent, append a pause after each text layer.