Copyparty and other file servers expose each folder as an OPDS feed where
subfolders are rel="subsection" navigation entries. Auto-download only
followed the catalog's "by newest" feed or the subscribed feed itself, so
books in subfolders were never discovered, and a folder containing only
subfolders was skipped entirely.
When a catalog has no "by newest" feed, treat it as a directory-style
listing and crawl its subsection navigation entries breadth-first, bounded
by MAX_CRAWL_DEPTH levels, MAX_FEEDS_PER_CRAWL fetches, and the visited
set. Library catalogs with a "by newest" feed keep the previous behavior
and are never crawled. Facet and structural rels (self, up, start, top,
search) are excluded so the crawl cannot escape the subscribed folder.
Fixes#4272
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Huang Xin
e7f0b53bdf