Patrick Buckley
54631d3111
fix( #894 ): render-time gate at the refetch chokepoint; liveness-gate the retry; G4/G5 scenarios
...
Review round 4 (1 major + 3 minor bug, 1 major + 3 minor quality;
bug-4≡q-2). Two correctness findings landed in one seam — the
refetch-vs-live-state chokepoint — so the seam was redesigned once
against its matrix (caller x stream-state-at-render x refs-at-render)
instead of patched per-finding:
- RENDER-TIME gate inside refetchHistory, post-await, pre-wipe: the
await is a real window (queued sends drain at exactly the idle edges
the backstop rides; another operator on a shared coordinator can send
any time; hide/suspend can land mid-fetch), and only the chokepoint
can see across it. Skip the wipe when a live turn exists (content
refs — a wipe strands the bubble and loses the rest of the turn
invisibly) or when a seedless render lost its idle/live-stream
precondition (busy covers the tool phase the ref check can't see;
a dead stream means rendering past the frozen cursor and
double-rendering on the show-edge replay). Both requirements key on
the seedCursor ARG — seeded callers own their reconnect flows and
legitimately rebuild mid-turn. Skips leave the latch set; heals
converge at the next organic settle.
- The retry's fire guard gains evtSource (close-on-hide keeps the timer
armed by design; a hidden firing must not fetch). The backstop needs
no term — it runs inside SSE dispatch.
- Pins: producer ORDER (inc < await < finally < dec), ref-guard pairs
on both heal arms, the else-if exclusivity structure, the render-gate
order and terms, the evtSource guard tail. Seven mutants, all caught.
- Harness: __esOpens gate in G1-G3 (a pre-connect rewind drops its
clear_ui into a channel nobody joined and false-fails the scenario);
G4 coord-heal-midturn (a turn started under a held backstop fetch
survives its resolution; hist==2 is the discriminating bit — noted
honestly in the docstring); G5 coord-hidden-retry (hidden0
non-occurrence + organic-settle heal after show, per the accepted
liveness-lag ruling — a quiet reconnect delivers no state_change
edge). Negative controls: gate-stripped stamps hist1; guard-less
stamps hidden1. Docstring gains the G-family catalog.
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