try_attach_device was rejecting any device that did not report KEY_A or
KEY_R — a leftover heuristic from the whisper-overlay seed. A user whose
binding was anything else (Ctrl+Shift+D is a common default) would see
no hotkey events from that device even though it supports the key.
Replace the hard-coded check with device_supports_combo(supported,
combo), a pure helper that reads the configured trigger key code from
the HotkeyCombo snapshot. Snapshot is taken from hotkey_rx.borrow()
before opening the device; an unconfigured or shutting-down listener
short-circuits to a non-attach.
Four regression tests in linux::tests cover: supported+D → attach,
unsupported → reject, no reported keys → reject, and the explicit
non-A/non-R case that demonstrates the bug.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Jake
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