Internal folds don't get drawn to SVG
This was a choice, why?
https://git.uclalemur.com/roco/rocolib/-/blob/main/rocolib/api/composables/graph/DrawingEdge.py#L14
(Or maybe the real problem is the auto fold->flex at: https://git.uclalemur.com/roco/rocolib/-/blob/main/rocolib/api/composables/graph/DrawingEdge.py#L32 )