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Draft: Fix McEventCollectionCnv_p5 so that an identical McEventCollection is produced

John Derek Chapmanrequested to merge
jchapman/athena:GeneratorObjectsTPCnvUnitTests_21.0 into 21.0

Based on !39716 (merged).

The current version of McEventCollectionCnv_p5 flips the order of the GenParticles associated with each GenVertex after T1->P1->T2 conversion. Running though this twice is sufficient to regain agreement (i.e. T1->P1->T2->P2->T3. T1 == T3 != T2).

In this merge request McEventCollectionCnv_p5::persToTrans is revised so that T2 == T1 again.

Edited by John Derek Chapman

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