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Document::symbol_art_bounds measured a symbol's art without the document, so an instance of another symbol in that art counted as the 20 x 20 square. It now measures the art through SymbolBoxes, so a nested instance takes its own symbol's art, and an inline graphic of the outer symbol is sized by it and follows it when that symbol changes. - The inline resolve order also follows the instances that size a symbol's art, so a symbol is measured after the type in the art of the symbols it holds is laid out again. - A symbol whose art reaches itself through an instance and an inline graphic is an empty slot. Only instances that the measurement uses count, so one a clipping path hides adds no dependency. - A missing symbol, a symbol without art, a symbol that holds an instance of itself, and nesting 32 deep still measure as the square. - SymbolBoxes finds symbols through a name index built once, and the inline resolve pass and inline_art_bounds share one index, instead of scanning the symbol list for each lookup.