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Returning to a drilldown breadcrumb retains that breadcrumb itself · case 02

Returning to a drilldown breadcrumb retains that breadcrumb itself is violated by the widget projection.

Member previewVariant 2 · 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: Returning to a drilldown breadcrumb retains that breadcrumb itself.

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": ["a", "y"], "breadcrumb-cut": [], "drilldown-depth": 1, "effective-constraints": ["a"], "root-reset": []}`	`{"active-crumb": 0, "branch-after-back": ["a", "y"], "breadcrumb-cut": ["a"], "drilldown-depth": 1, "effective-constraints": ["a"], "root-reset": []}`	Failed

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