6832a4375e
The 4.x tracking enforces reduced dimensionality on the parcels by moving them to the centre of the mesh at the start of each track, without considering the topology. This can leave the parcel outside it's associated tetrahedron. The barycentric algorithm isn't tolerant to incorrect topology, so instead of changing position, it was written to track to the mesh centre. This worked, but effectively doubled the number of tracking calls. This additional cost has now been removed by absorbing the constraint displacement into the existing motion track, so that the same number of tracking steps are performed as before. Partially resolves bug report https://bugs.openfoam.org/view.php?id=2688
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