Aari 919caf7c83
fix(gateway): keep a manual rename through edit and rerun (#4539)
Renaming a conversation and then editing one of its turns reverts the
title to whatever it was before that turn ran, so the user's own name for
the thread is silently replaced by an older automatically generated one.

Edit replay resumes from the checkpoint before the edited turn, and that
checkpoint predates the rename. Regenerate already guards against exactly
this rollback by replaying the current title as graph input; the edit
replay path was added later and did not carry the guard over.

Replay the title the same way, but only when the replay base already has
one. An untitled base belongs to a thread the title middleware has not
named yet — pinning the current title there would keep a name generated
from the prompt this edit just replaced, and stop the middleware from
naming the rewritten turn.
2026-07-28 18:06:23 +08:00
..