Pre-existing (byte-identical to origin/main), flagged by CodeRabbit on #844: the
outer try's only guard was `except Exception as e: log.exception("highway_ws
unhandled error")`. The inner `except WebSocketDisconnect` covers ONLY the
post-`ready` keep-alive loop, and the drum_tab/notation sends have their own
localized guards — but the ~13 other streamed sends (beats, sections, notes,
chords, anchors, …) fall through to the blanket handler. Since
WebSocketDisconnect is an Exception subclass, a routine tab-close mid-load was
logged as an error at whichever send was in flight.
Fix: a dedicated `except WebSocketDisconnect: return` before the blanket handler,
matching the two localized guards and the lib/ coding guideline.
tests/test_ws_highway_disconnect.py drives highway_ws with a fake websocket that
raises WebSocketDisconnect on the first streamed send (`loading`), over a real
minimal sloppak. Negative-checked: removing the guard makes it fail (the
disconnect is logged as `highway_ws unhandled error`); the fix passes. Uses a
raw handler on `feedBack.server` rather than caplog, since configure_logging()
reroutes that logger through structlog where caplog doesn't observe it.
Full suite green. Closes the review thread on #844.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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