PhotoThumbnail computed cell height as size * min(aspectRatio, 1.5),
so portrait photos overflowed their row. The TanStack Virtual row
estimate is a single fixed value (thumbnailSize + gap), so any cell
taller than that pushed into the row below — visible as overlapping
thumbnails whenever a portrait shared a row with landscapes.
Switching to square cells (Lightroom Library default) means every row
is exactly the estimated height. The image still fills via object-cover,
just cropped on the long axis.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
dtoro
6e6672f225