The DM topic reply fallback code in send() hardcoded should_thread=True
when telegram_dm_topic_reply_fallback metadata was present, bypassing
_should_thread_reply() and ignoring reply_to_mode config. This caused
quote bubbles on every response even with reply_to_mode: 'off'.
Fix:
- Add reply_to_mode param to _reply_to_message_id_for_send() and
_thread_kwargs_for_send() classmethods
- In send(), check self._reply_to_mode != 'off' for DM topic fallback
- Suppress reply anchor and reply_to_message_id when mode is 'off'
while preserving message_thread_id for correct topic routing
- Thread reply_to_mode through all 29 call sites
Regression coverage: 10 new tests in test_telegram_reply_mode.py
covering classmethod behavior, send() integration, and backward
compatibility.
Fixes reply_to_mode: 'off' ignored by Telegram DM topic reply fallback code #23994
21a15b6711