OK. I wrote the following one-line functions to solve my own problem. Hopefully helpful for others as well:
function GetPairwiseAlignmentSeqStart(aln::PairwiseAlignment)
return aln.a.aln.anchors[1].seqpos + 1
end
function GetPairwiseAlignmentRefStart(aln::PairwiseAlignment)
return aln.a.aln.anchors[1].refpos + 1
end
function GetPairwiseAlignmentSeqEnd(aln::PairwiseAlignment)
return aln.a.aln.anchors[end].seqpos
end
function GetPairwiseAlignmentRefEnd(aln::PairwiseAlignment)
return aln.a.aln.anchors[end].refpos
end