+ else
+ {
+ // sequence refs are identical. We may need to update the existing dataset
+ // alignment with this one, though.
+ if (ds != null && dseqs == null)
+ {
+ int opos = ds.findIndex(dsq);
+ SequenceI tseq = null;
+ if (opos != -1 && vseqpos != opos)
+ {
+ // remove from old position
+ ds.deleteSequence(dsq);
+ }
+ if (vseqpos < ds.getHeight())
+ {
+ if (vseqpos != opos)
+ {
+ // save sequence at destination position
+ tseq = ds.getSequenceAt(vseqpos);
+ ds.replaceSequenceAt(vseqpos, dsq);
+ ds.addSequence(tseq);
+ }
+ }
+ else
+ {
+ ds.addSequence(dsq);
+ }
+ }
+ }