FA-76999 / Calendar recurrence rules / Member archive

Applying moved and cancelled instance overrides in a window query: orphan guard · case 04

An override for a date that is not an instance adds a phantom occurrence.

Member previewVariant 4 · 3 implementations · 7 checks per implementation

Case contract

A daily-interval series of count instances. overrides is an ordered list of [original_date, new_date] where new_date None cancels; for repeated originals the last override wins; overrides whose original is not a series instance are ignored. Return [original, actual] pairs for instances whose actual date lies in [window_start, window_end], sorted by actual then original date.

Why this case matters

Recurring calendar series are expanded into concrete instances for display, reminders and conflict checks.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
orphan after series end	`[["2024-05-01", "2024-05-01"], ["2024-05-02", "2024-05-02"], ["2024-05-10", "2024-05-02"], ["2024-05-03", "2024-05-03"]]`	`[["2024-05-01", "2024-05-01"], ["2024-05-02", "2024-05-02"], ["2024-05-03", "2024-05-03"]]`	Failed

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