grow_lineage from row/col edge pair. internal function for rdendromap
| 1 2 3 4 5 6 7 8 9 10 11 | grow_lineage(
  row.edge,
  col.edge,
  row.tree,
  col.tree,
  rowEdgeMap,
  colEdgeMap,
  lineage_size,
  rowDescendants,
  colDescendants
)
 | 
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