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
64f5b91eee