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test(thread): poll instead of fixed sleeps in the tail-first tests - #1497

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currentbits merged 1 commit into
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fix/tail-first-test-poll
Oct 6, 2026
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currentbits merged 1 commit into
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fix/tail-first-test-poll

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#1489's "mounts a big thread's tail first" test failed on #1494's Ubuntu CI. #1494 is electron-only, so the failure isn't related to it.

Cause: the test waited a fixed 50 ms for the tail-first fill-in. That fill-in parses five large answers one idle slot at a time (setTimeout(0) under jsdom) and then mounts in a transition, which can outrun 50 ms on a loaded runner.

Fix: poll for the condition every 50 ms for up to 5 s. The sibling test's 120 ms stream-throttle sleep gets the same treatment. Test-only change; all 7 window tests pass locally.

🤖 Generated with Claude Code

…1475)

The tail-first fill-in parses five large answers one idle slot at a time
(setTimeout(0) under jsdom) and then mounts in a transition; a fixed 50 ms
sleep lost that race on a loaded Ubuntu runner (seen on #1494's CI, an
electron-only PR). Poll up to 5 s for the condition instead, same for the
120 ms stream-throttle wait in the sibling test.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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📝 Code Review ✅ Completed 2026-10-06T13:33:26.366403Z 43b29db PR opened
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@currentbits
currentbits merged commit 6f65328 into main Oct 6, 2026
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