withinLink mark on circular track does not show border

[etowahadams]

When withinLink is used on a circular track, the border does not show.

Spec to reproduce:

{"arrangement": "horizontal","assembly": [["chr",100]],"static": true,"title": "No border for withinLink track","views": [{"arrangement": "horizontal","centerRadius": 0.5,"layout": "circular","views": [{"spacing": 0.1,"tracks": [{"title": "withinlink","data": {"chromosomeField": "chr","genomicFields": ["start","end"],"type": "json","values": [{"chr": "chr","end": 20,"end1": 30,"label": "A","start": 10,"start1": 20,"value": 2},{"chr": "chr","end": 50,"end1": 60,"label": "B","start": 30,"start1": 40,"value": 3},{"chr": "chr","end": 90,"end1": 100,"label": "C","start": 60,"start1": 70,"value": 1}]},"height": 150,"mark": "withinLink","opacity": {"value": 0.5},"style": {"outline": "black","outlineWidth": 1},"width": 150,"x": {"axis": "none","field": "start","type": "genomic"}}]},{"spacing": 0.1,"tracks": [{"title": "betweenLink","data": {"chromosomeField": "chr","genomicFields": ["start","end"],"type": "json","values": [{"chr": "chr","end": 20,"end1": 30,"label": "A","start": 10,"start1": 20,"value": 2},{"chr": "chr","end": 50,"end1": 60,"label": "B","start": 30,"start1": 40,"value": 3},{"chr": "chr","end": 90,"end1": 100,"label": "C","start": 60,"start1": 70,"value": 1}]},"height": 150,"mark": "betweenLink","style": {"outline": "black","outlineWidth": 1},"width": 150,"x": {"axis": "none","field": "start","type": "genomic"}}]}]}],"xDomain": {"chromosome": "chr","interval": [0,100]}}