FA-32279 / Keyboard interactions / Member archive
Deferred short shortcut versus longer key sequence: Mismatch retry loses the current key or retries the already failed prefix · case 04
The event trace violates the retry current rule and produces incorrect keyboard state or command output.
Case contract
Case [bindings,timeout,events]. Binding [nonempty_key_sequence,action] has unique sequence. Events [kind,key,time]. Down extends prefix. Exact match with longer candidates is delayed until deadline; exact unambiguous match dispatches immediately. Tick or next event at deadline emits pending exact match and clears prefix. Mismatch dispatches pending match then retries only current key as fresh prefix. Cancel drops pending without dispatch. Return [action,time] dispatches,buffer,pending action,deadline. 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 |
|---|---|---|---|
| ambiguous-shortcut-prefix scenario 4 | [[[["short", 12]], [], null, null], [[["short", 12]], [], null, null], [[["short", 12]], [], null, null], [[["short", 12]], [], null, null]] | [[[["short", 12], ["other", 12]], [], null, null], [[["short", 12], ["other", 12]], [], null, null], [[["short", 12], ["other", 12]], [], null, null], [[["short", 12], ["other", 12]], [], null, null]] | Failed |
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