fix(event): suppress native asyncio.QueueShutDown on Python 3.13+

[axelray-dev]

Summary

On Python 3.13+, asyncio.Queue.shutdown() makes queue.get() raise the stdlib asyncio.QueueShutDown. EventProcessor only suppressed a local subclass of that exception, so the native instance was treated as an unexpected processor error and could emit error logs/telemetry during normal stop.

Changes

• Catch/suppress the native asyncio.QueueShutDown (when present) in _process_queue and stop.
• Keep the pre-3.13 local QueueShutDown fallback for artificial raises.
• Add a unit regression that shuts down a native queue and asserts stop/process does not call telemetry/console error helpers.

Verification

• uv run pytest tests/units/reflex_base/event/processor/test_event_processor.py -q (37 passed)
• Ruff and targeted Pyright clean on touched files

Backwards compatibility

No public API change. Pre-3.13 behavior unchanged. Stop still drains and cancels as before; only expected shutdown exceptions are ignored correctly.

Fixes #6756

[greptile-apps]

Greptile Summary

This PR fixes a Python 3.13+ regression where asyncio.Queue.shutdown() raises the native asyncio.QueueShutDown base class, but the processor only suppressed the local subclass — meaning the base-class instance escaped as an unexpected error during normal shutdown. The fix introduces a _QUEUE_SHUTDOWN_ERRORS tuple, populated with asyncio.QueueShutDown on 3.13+ and the pre-existing local class otherwise, and uses it in both contextlib.suppress and the except clause.

• event_processor.py: Adds _QUEUE_SHUTDOWN_ERRORS at module level (branched on hasattr(asyncio, \"QueueShutDown\")) and substitutes it everywhere QueueShutDown was previously caught directly.
• test_event_processor.py: Adds a skipif-guarded regression test that shuts down a native queue, calls _process_queue and stop directly, and asserts that neither telemetry.send_error nor console.error is invoked.

Confidence Score: 5/5

Safe to merge — the change is narrowly scoped to exception handling during shutdown, with no behavioural impact on the hot path.

The fix is minimal and targeted: it replaces a single exception class with a version-aware tuple in two catch sites, pre-3.13 behaviour is completely unchanged, and a new regression test directly exercises the 3.13+ code path.

Files Needing Attention: No files require special attention.

Important Files Changed

Filename	Overview
packages/reflex-base/src/reflex_base/event/processor/event_processor.py	Introduces _QUEUE_SHUTDOWN_ERRORS tuple to correctly catch the native asyncio.QueueShutDown (Python 3.13+) alongside the local subclass, fixing uncaught exceptions during shutdown
tests/units/reflex_base/event/processor/test_event_processor.py	Adds a Python 3.13+-only regression test that verifies native asyncio.QueueShutDown is suppressed in both _process_queue and the queue task awaited during stop, asserting telemetry/console errors are not emitted
packages/reflex-base/news/6773.bugfix.md	Changelog entry for the bugfix; missing trailing newline (cosmetic)

_{Reviews (2): Last reviewed commit: "add news fragment" | Re-trigger Greptile}

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 8 skipped benchmarks¹

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_{Comparing axelray-dev:fix/queue-shutdown-py313 (c0a5c85) with main (a8857cd)}

Footnotes

1. 8 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩