Deleting a symbol whose terminal held several wires joins the wires
left behind with a new one. That wire got a random uuid, so the same
deletion saved a different file every time: a diff for nothing in a
project kept in git (discussion #1512), and two copies with the same
edit could not be compared.
Its uuid now comes from its two ends (each end's symbol and terminal,
sorted), the recipe a wire saved without a uuid already gets on load
(Diagram::fromXml(), derivedItemUuid()). Undo and redo keep the same
wire, so its uuid too.
tst_joinedwireuuid deletes the coil KA1 of examples/affuteuse_250h.qet
in two runs: both saves are identical and no wire has a random uuid.
Without the fix one wire has a random uuid.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XCdg2Er2vYhB8Vwa5G7fSR
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