Bug: qfc-item-controller-expansion-registry-divergence

[drmoisan]

• Work Mode: minor-audit

Summary

QfcItemController's synchronous and asynchronous expansion paths maintain disjoint keyboard-action
registries for the 'B' and 'D' keys while sharing a single _expanded state flag. Interleaving
the two paths drives the flag and the registries out of agreement, and the next registration throws
ArgumentException because KbdActions.Add is not idempotent.

Environment

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Steps to Reproduce

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Expected Behavior

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Actual Behavior

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Logs / Screenshots

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Impact / Severity

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Source

From: docs/features/potential/2026-08-07-qfc-item-controller-expansion-registry-divergence.md