FA-31725 / Keyboard interactions / Member archive

Adjacent keyboard repeat batch coalescing: A raw key barrier loses or misclassifies the accumulated repeat batch · case 05

The event trace violates the barrier flush rule and produces incorrect keyboard state or command output.

Member previewVariant 5 · 3 implementations · 9 checks per implementation

Case contract

Events [kind,device,code,time,repeat]. Consecutive repeated down events for the same device/code coalesce into [device,code,first,last,count]; any nonrepeat or non-down event flushes the batch and is emitted as a raw event. A repeated down for a different token flushes and starts another. Return ordered entries tagged repeat or raw. 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 fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
repeat-coalescing scenario 5	`[[["raw", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["raw", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["raw", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["raw", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["raw", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]]]`	`[[["repeat", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["repeat", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["repeat", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["repeat", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]], [["repeat", "a", "A", 10, 10, 1], ["raw", "up", "a", "A", 12], ["repeat", "a", "A", 14, 14, 1]]]`	Failed

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