FA-7974 / Selection controls / Member archive
Anchored range selection: The clicked endpoint is excluded from range selection · case 04
The clicked endpoint is excluded from range selection.
Case contract
Ranges include both endpoints in document order; plain clicks replace; additive selection unions; missing targets preserve selection.
Why this case matters
A deterministic model of anchored range selection; this isolates one interface invariant without requiring a browser.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| forward | ["a", "b"] | ["a", "b", "c"] | Failed |
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