* fix(threads): stop background work at exit, on cleanup and on the tests' unload (#301)
- __init__.py: _stop_background_work() detaches the monitor's callbacks,
stops the monitor, closes the preview worker and shuts the prompt
cleanup thread down against one 10 s deadline, once. It runs from
atexit (ComfyUI never runs aiohttp's cleanup hooks), from on_cleanup
where a host runs it, and from the tests' package unload; it removes
its own atexit callback. Registered after the history hook, so at exit
it runs before the history dispose.
- AutoThumbnailer.close/close_auto_thumbnails take a timeout and return
whether the worker ended.
- Tests: teardown result, once-only, on_cleanup, atexit order, a failing
step or a second Ctrl+C never skipping the tracker, one shared
deadline, three repeated loads leaving no thread, and a child process
that exits normally with the image worker alive.
* fix(threads): refuse new previews before the monitor stops; isolate the exit child (#301)
Review findings:
- The teardown makes the API refuse new previews before it detaches the
monitor's callbacks: an image in hand that already read the preview
queue no longer starts a preview worker during exit (Python 3.12+
refuses that thread and logs a traceback). New
refuse_auto_thumbnails().
- The teardown imports its bounds inside each step and falls back to the
standard logger, so a failing import never skips the other steps.
- The exit child keeps its library and log in its own folder
(PROMPT_MANAGER_DATA_DIR), reports watchdog's threads too, fails with
the child's output on a hang, and rejects "Error while stopping".
- TESTING.md: "Background threads at exit".
