yAsSeq = hiddenSeqs.adjustForHiddenSeqs(
hiddenSeqs.findIndexWithoutHiddenSeqs(yAsSeq));
yAsSeq = Math.max(yAsSeq, 0); // -1 if before first visible sequence
yAsSeq = hiddenSeqs.adjustForHiddenSeqs(
hiddenSeqs.findIndexWithoutHiddenSeqs(yAsSeq));
yAsSeq = Math.max(yAsSeq, 0); // -1 if before first visible sequence