Alex Pearce authored Oct 26, 2017 and Rosen Matev committed Jan 11, 2022

Charged particles should be considered as perfectly overlapping if their
ProtoParticle objects are the same *or* if their Track objects are the
same.

This matches the pointer-based implementation in LoKi::CheckOverlap, but
omits the more detailed, measurement-based implementation.

Moved from Phys@1db28a49