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qelectrotech-source-mirror/sources
Dieter Mayer 20a7047b27 Renew element uuids when duplicating a folio
The project panel's "copy and paste" action duplicates a folio through
an XML round-trip (toXml/fromXml), and Element::fromXml adopts the uuid
stored in the XML - so every element on the duplicated folio kept the
uuid of its source element. On-diagram copy/paste already handles this
(PasteDiagramCommand::redo() calls newUuid()), but the folio-duplicate
path bypasses that command.

Since element.uuid is the PRIMARY KEY of the project database, the
duplicated elements failed to insert ("UNIQUE constraint failed:
element.uuid" spam in the log) and silently disappeared from
nomenclature/summary tables, even though they are valid on the folio.

Renew the uuid of every element on the freshly duplicated folio, exactly
as the paste command does. In-memory links established during fromXml
are pointer-based and unaffected; the new uuids are written on save.
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