FA-26215 / Filter interfaces / Member archive

The active breadcrumb identifies the final actual drilldown step · case 05

The active breadcrumb identifies the final actual drilldown step is violated by the widget projection.

Member previewVariant 5 · 3 implementations · 10 checks per implementation

Case contract

A facet drilldown trail records a sequence of scoped constraints; returning to a breadcrumb truncates later drilldowns while preserving independent global filters. This example checks: The active breadcrumb identifies the final actual drilldown step.

Why this case matters

Filter-widget state and serialization must preserve user constraints while the view changes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
contract fixture 0	`{"active-crumb": 0, "branch-after-back": ["x"], "breadcrumb-cut": [], "drilldown-depth": 0, "effective-constraints": [], "root-reset": []}`	`{"active-crumb": null, "branch-after-back": ["x"], "breadcrumb-cut": [], "drilldown-depth": 0, "effective-constraints": [], "root-reset": []}`	Failed

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