render: dagre layout min spacing

[gavin-ts]

Summary

Dagre layouts had a fixed ranksep of 100, but this could sometimes be insufficient space for large edge labels.
This checks all the edge label dimensions to determine the minimum spacing necessary to nicely fit all edge labels.

Details

• fixes dagre: ensure sufficient space between shapes for large edge labels #263
• adds e2e test for spacing with horizontal direction
• ensures ranksep is sufficient space for all edge labels

before/after

e2e report delta

[ejulio-ts]

what about setting nodesep too to solve
maybe, this case is more about setting the container width to wrap the edge label too instead of only the node 🤔

[alixander]

@ejulio-ts yeah unfortunately, dagre doesn't let us set container widths =(

[gavin-ts]

what about setting nodesep too to solve maybe, this case is more about setting the container width to wrap the edge label too instead of only the node 🤔

we could adjust nodesep which indirectly affects container padding but it will affect all node spacing