FA-31260 / Keyboard interactions / Member archive
Keyboard layout mapping generations: Physical code and device identity are misplaced in the layout cache key · case 05
The event trace violates the map key rule and produces incorrect keyboard state or command output.
Case contract
Events [kind,device,a,b]. layout replaces device generation a and clears cached labels; map caches physical code a to label b in current generation; lookup emits cached label or code a as fallback. Disconnect removes generation and cache. Maps and lookups before layout are ignored. Return emitted labels, generations and cached [device,code,label] rows. 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 |
|---|---|---|---|
| layout-cache scenario 2 | [[["KeyA"], [["a", 1]], [["KeyA", "a", "x"]]], [["KeyA"], [["a", 1]], [["KeyA", "a", "x"]]], [["KeyA"], [["a", 1]], [["KeyA", "a", "x"]]], [["KeyA"], [["a", 1]], [["KeyA", "a", "x"]]], [["KeyA"], [["a", 1]], [["KeyA", "a", "x"]]]] | [[["x"], [["a", 1]], [["a", "KeyA", "x"]]], [["x"], [["a", 1]], [["a", "KeyA", "x"]]], [["x"], [["a", 1]], [["a", "KeyA", "x"]]], [["x"], [["a", 1]], [["a", "KeyA", "x"]]], [["x"], [["a", 1]], [["a", "KeyA", "x"]]]] | Failed |
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