A video listed without a preview still renders its own element and is
released on refresh. Test teardowns and the browser reset stop the
automatic preview worker before the temp tree goes, so no preview lands
after cleanup (Windows). TESTING.md documents automatic previews.
New outputs never got a preview, so the workspace grid loaded full-size
originals (844 of 19,907 images on a live install, exactly the newest).
- Listings always give images and videos a thumbnail URL; a missing
preview is made by the serve route on first view (bounded, single
flight per file) and falls back to the original, remembering files
that cannot be decoded.
- The image monitor queues each settled output's preview on one
background worker that follows Worker threads.
- A scan that leaves 200 or more previews missing starts the visible
thumbnail job; fewer go through the worker.
- Automatic previews wait for a restore, a duplicate removal, a sources
change, the gallery's clear and exclusive jobs.
- The inspector cover uses the preview; the Overview row counts
previews that failed.
Vito Sansevero