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test(multiple-subtitles): [PKG-MULTI-SUB-09] isolate old-core source seeking from caption loss

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Harvey Zhao committed 2026-09-14 13:02:49 +08:00
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commit 31f9024bff
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+8419 -18
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refactor/risks.json
+16 -7
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@@ -6028,21 +6028,30 @@
{
"id": "MULTI-SUB-SWITCH-01",
"title": "Intermittent WebKit core5.3.0 caption loss after selected-track source switch",
"confirmation": "unverified",
"workspaceState": "One Windows WebKit26.6 run lost Translation after switchUrl and seek1.5; diagnostic rerun passed without a production change. Root cause and reproducibility are unresolved; do not mark accepted or fixed. Expanded153 offset/lifecycle run again lost the selected caption after source switch on published5.3.0 and5.4.0 in WebKit, while candidate core passed. Root cause remains unclassified; the offset fix does not close this issue.",
"compatibleResolution": "Inspect native track loading and source-switch ordering with deterministic state evidence; distinguish historical host failure from fixture ordering and candidate regression.",
"confirmation": "reproduced",
"workspaceState": "Original failing snapshots kept the1..3 cue intact but video time was near0.002. Independent no-plugin and published1.2/current-plugin WebKit traces reproduce5 old-core first-seek misses, with promises sometimes settled during native seeking. Candidate already waits and honors every first seek. Actual main three-engine probes and corrected normal caption sequencing pass; old race observations remain explicit.",
"compatibleResolution": "Classify the old-host source/native-seek race separately from caption rendering; preserve immediate-call probes, require candidate first seeks, and wait for real native source completion before independent caption-seek assertions.",
"closureCriteria": "Root cause classified with targeted evidence, any required fix validated, and changed candidate/old-core combination rerun without hiding the original failure.",
"status": "open",
"status": "resolved",
"owners": [
"PKG-MULTI-SUB-05"
"PKG-MULTI-SUB-05",
"PKG-MULTI-SUB-09"
],
"evidence": [
"refactor/changes/2026-09-14-PKG-MULTI-SUB-05-combinations.md",
"refactor/baselines/multiple-subtitles-combinations-validation.json",
"test/browser/multiple-subtitles-combinations.spec.js",
"refactor/changes/2026-09-14-CORE-SUBTITLE-OFFSET-01-paused.md",
"refactor/baselines/subtitle-offset-validation.json"
]
"refactor/baselines/subtitle-offset-validation.json",
"refactor/changes/2026-09-14-PKG-MULTI-SUB-09-switch-order.md",
"refactor/baselines/multiple-subtitles-switch-validation.json",
"test/browser/multiple-subtitles-switch.spec.js"
],
"resolutionEvidence": [
"refactor/changes/2026-09-14-PKG-MULTI-SUB-09-switch-order.md",
"refactor/baselines/multiple-subtitles-switch-validation.json"
],
"resolutionRationale": "No-plugin controls reproduce the same miss and a settled seek restores correct old/new captions without changing plugin data. Candidate source code already provides the necessary readiness guard (BASE-LIFE-44/CORE-19 context). This resolves the suspected plugin-switch defect; it does not approve every historical source call or complete package task05."
}
]
}