Review follow-up (CodeRabbit): thumbnails rendered the symbol alone in an empty document, so a
symbol nesting another one, or painting with a pattern or showing an image, lost that art in the
Symbols panel and in symbol library panels. The preview now renders an instance alone on a copy of
the document (or library) the symbol comes from, which keeps its resources but none of its art,
and the thumbnail cache also follows the art of the document's symbols and patterns.
Taha-Mahmoodi
89abc2c9d2