globalIndex gather fails with multi-world

As noted in discussions with @andy - the globalIndex gather uses procIDs, but these are the subranks (in the parent), not the actual ranks for the communicator.

@Mattijs

assigned to @mark

The wrapper function

void Foam::globalIndex::gather
(
    const UList<Type>& sendData,
    List<Type>& allData,
    const int tag,
    const UPstream::commsTypes commsType,
    const label comm
) const

accesses the UPstream::procID. This returns the ranks in the parent communicator, not the ranks in the current communicator (since they are always 0..nProcs-1).

mentioned in commit f1ecad63

@andy - just placed on fix-2706-globalIndex-multiworld. Could you pick that across (for 2206) and see if that solves your problem? If so, then it is also ready for the maintenance-v2212 already.

closed via commit c9081d5d

yes - good change

I'll pick across for a few maintenance versions.

mentioned in commit a7d77391

mentioned in commit 58a5587c

mentioned in commit 2c6fc157