FA-31464 / Keyboard interactions / Member archive
Overlapping keyboard sequence matcher: The newest physical key is prepended or replaces the current matched prefix · case 04
The event trace violates the candidate append rule and produces incorrect keyboard state or command output.
Case contract
Case [sequence,timeout,events]. Nonempty sequence is list of key names. Events [kind,key,time,repeat]. Only nonrepeat down feeds matcher. Accepted downs more than timeout after the previous accepted down discard the prefix; tick likewise expires it. Cancel resets prefix and clock. Keep longest suffix matching a sequence prefix, and after a match retain the longest proper overlapping prefix. Return match timestamps, partial prefix and last accepted time. Inputs are finite ordered event traces; return the stated deterministic state. Batch entries are independent. N varies the number of independent input transactions.
Why this case matters
Controlled keyboard event processing model for debugging application event logic.
One recorded failure
Sample boundary fixtureThis sample comes from the broken implementation of a controlled reproducer.
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| sequence-prefix scenario 1 | [[[], ["A"], 15], [[], ["A"], 15], [[], ["A"], 15], [[], ["A"], 15]] | [[[15], [], 15], [[15], [], 15], [[15], [], 15], [[15], [], 15]] | Failed |
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