Fix the reading of HepMcParticleLink_p1 in master

Even in 21.0 HepMcParticleLinks pointing to GenEvents which aren't the first entry in the McEventCollection are using the event numbers rather than the position McEventCollection as the eventIndex.

FYI @npetters and @ncalace

added bugfix label

unmarked as a Work In Progress

This merge request affects 1 package:

• Generators/GeneratorObjectsTPCnv

added Generators master review-pending-level-1 labels

Hi @miochoa and @jferrand,
This one may possibly help out with issues seen with truth matching seen in physics validation when reading files produced in 21.0 with master.

Cheers,

John

FYI @wlampl and @emoyse.

CI Result SUCCESS (hash 822f9778)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 10636]

Changes and CI look good. Approving.

Kira (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 2597fec8

added sweep:ignore label

mentioned in merge request !31114 (merged)