FA-26207 / Filter interfaces / Member archive

A new drilldown after backing up replaces the abandoned trail suffix · case 02

A new drilldown after backing up replaces the abandoned trail suffix 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: A new drilldown after backing up replaces the abandoned trail suffix.

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": 2, "branch-after-back": ["a", "b", "a", "y"], "breadcrumb-cut": ["a"], "drilldown-depth": 3, "effective-constraints": ["a", "b", "a"], "root-reset": []}`	`{"active-crumb": 2, "branch-after-back": ["a", "y"], "breadcrumb-cut": ["a"], "drilldown-depth": 3, "effective-constraints": ["a", "b", "a"], "root-reset": []}`	Failed

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