FA-11318 / Media playlist lifecycle / Member archive

Previous track history: Appends the displaced current item after existing forward history · case 03

Appends the displaced current item after existing forward history and produces an incorrect media-control or presentation result.

Member previewVariant 3 · 3 implementations · 6 checks per implementation

Case scope

Appends the displaced current item after existing forward history and produces an incorrect media-control or presentation result.

Why this case matters

A deterministic in-memory media application model with explicit playlist, timeline or synchronization semantics. Does not implement codecs, transport protocols, rendering hardware or concurrent playback.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
forward stack preserves order	`["b", 0, ["a"], ["d", "e", "c"]]`	`["b", 0, ["a"], ["c", "d", "e"]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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