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Text selection replacement: Backward selections retain selected suffix text · case 02
Backward selections retain selected suffix text.
Case contract
Composition is preserved; replace the normalized half-open selection and collapse both endpoints immediately after inserted text.
Why this case matters
A deterministic model of text selection replacement; 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 |
|---|---|---|---|
| backward | ["aXYbcdef", 3, 3] | ["aXYef", 3, 3] | Failed |
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