Fix daughter labels when running parallel merger #5286
Merged
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This PR fixes the daughter labels when running parallel simulation.
The merger code was resetting the
firstDaughterLabel
of all tracks, which caused the information for the generator history to be lost.The fix now resets the
firstDaughterLabel
ONLY if the tracks was actually transported.Eventually, if the track has generated secondaries the labels of the daughters will be set in the following loop, as it was previously.