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A symbol saved without a uuid got a random one from Element::fromXml() on every load, and the next save wrote it out: two loads of the same file gave the same symbol two identities, and anything pointing at it by uuid (a script, a comparison of two versions, a wire's identity) could not follow it from one session to the next. When a folio is loaded, such a symbol now gets a UUID v5 derived from what it is and where it sits: its type, its position on the folio and its orientation. Never the folio's index, so inserting or moving a folio does not change it. Identical symbols stacked on one spot, or a copied folio, are told apart by a counter kept per project (QETProject::derivedUuid()), in load order among those symbols alone. A paste still renews uuids. Symbols that have a uuid in the file keep it. All 24 example projects already have one for every symbol, so they are unchanged; with the symbols' uuids stripped, each saves byte-for-byte the same twice (master: different every time). tst_derivedsymboluuid runs --resave on a fixture with its uuids stripped: same uuids on every load, same after a folio is inserted in front, saved uuids kept, stacked copies differ. The first two fail without this change. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>