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f74659e903
YouTube's CDN advertises maxres/sddefault thumbnails for every video but only generates them for sufficiently high-res uploads, so older/low-res videos return 404 for those qualities. The view picked the best quality and showed a blank placeholder on failure with no fallback. VideoThumbnailView now accepts an ordered fallback chain and advances to the next candidate via NukeUI's onCompletion when a load fails, so a valid thumbnail is always shown. DeArrowVideoThumbnail feeds it DeArrow branding first, then the video's own thumbnails best-quality-first.