Brennan Benson
dc45f79465
multi-client-navigation-isolation.integration.test.ts fails intermittently on
clean main — measured at 4-8/24 with a flush-window sweep — and has been taxing
unrelated PRs across the repo.
Mechanism, confirmed by instrumented trace (schedule t=23412, listener REGISTER
23460/23461, coalescer fire 23462): a ~4ms race between the 50ms session-tabs
notify coalescer and listener registration in onMobileSessionTabsChanged. When
the pending timer fires after the listener registers but before
session.tabs.activate is handled, it emits a stale
{type:'updated', activeTabId:'host-tab'} that the test consumes.
flushAll() at the top of onMobileSessionTabsChanged, before the listener joins the
set — mirroring the flushAll() its own unsubscribe closure already performs.
DRAINING rather than cancelling is load-bearing: cancel/dispose has no emit, so it
would silence the stale frame but DELETE the pending update for subscribers
already registered, leaving them stale until an unrelated next schedule(). That
would trade a flaky test for a real lost-update bug. The newcomer cannot miss an
update by having it drained — listMobileSessionTabs and the coalesced emit read
the same mobileSessionTabsByWorktree map, and snapshot-read to listener-add is
macrotask-atomic.
Sweep: 4-5/24 before, 0/24 after. The regression test uses fake timers and is
two-sided — it fails if flushAll is removed (stale frame delivered) and fails if
flush is swapped for dispose (nothing drained), on different assertions, so it
pins the specific choice rather than merely the presence of a change.
Reviewed independently and returned clean with both mutations re-run by the
reviewer. A latent flushAll re-entrancy double-emit exists in principle — fire()
does not re-check pending.has the way flush() does — but is unreachable: both
production callers' listeners only invoke the dispatcher reply, a shape that has
shipped since #8141 on the symmetric unsubscribe flush.
Not verified: live paired-device mobile/relay behaviour (no device available); the
mobile conclusion rests on a code trace.
Orca
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The AI Orchestrator for 100x builders.
Run Codex, ClaudeCode, OpenCode or Pi side-by-side — each in its own worktree, tracked in one place.
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Mobile CompanionMonitor and steer your agents from your phone — get notified when an agent finishes and send follow-ups from anywhere. |
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