Problem B of #71047: with streaming + reply_to_mode='first', the streamed
preview is a reply-quote of the user's message. When the turn-final edit
hits flood control, the empty-tail fresh-commit resend either (a) also got
flood-capped -> the consumer reported 'failed', the gateway's normal final
send fired, and the never-deleted preview + the fresh final left TWO
visible bubbles, or (b) succeeded but as a plain non-reply message that
didn't match the preview's anchor.
- preserve the turn's reply anchor (initial_reply_to_id) on the
empty-fallback fresh-commit resend so the replacement message quotes the
user's message exactly like the preview and the non-streaming path
- retry a flood-rejected preview deleteMessage once (delete_message
returns False rather than raising) so the stale preview doesn't linger
next to the fresh final; still best-effort, and the preview is only ever
deleted AFTER the replacement send succeeded
- regression tests for the anchor, the delete retry, and the
flood-capped-resend single-bubble suppression decision
Builds on @fangliquanflq's PR #96097 ('preview' verdict for flood-rejected
fresh commits), cherry-picked as the previous commit with the conflict
against fd998120c1 resolved (record the payload AND keep
_delivery_ambiguous only for real timeouts).
Teknium
fab36436b2