The contributor's hunk passed reply_to=_initial_reply_to_id on every
fallback chunk, which also re-threaded tail continuations on every
platform. On main this chunk loop sends with no reply_to at all, so a
full resend (Feishu post vs cleaned-text prefix mismatch, #103068) lands
unthreaded next to the preview it replaces.
Thread only the full-resend case (continuation == final_text), and only
its first chunk. Tail continuations keep main's unthreaded delivery.
Co-authored-by: HanYunChenLuo <23613397+HanYunChenLuo@users.noreply.github.com>
Co-authored-by: Bartok9 <259807879+Bartok9@users.noreply.github.com>
Co-authored-by: huangyoje <25878791+huangyoje@users.noreply.github.com>
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