dagre: stop container edges at container label

[gavin-ts]

Summary

when an edge goes to a container, it often conflicts with the container's label so we want to stop the edge at its label instead.

Details

• stop dagre edge to container at the container's label if it runs into it
• add todo e2e test
• Note: this doesn't affect edges to container children which may also cross the container label

e2ereport changes

new e2e test before/after

closes #823

[alixander]

should we add label.PADDING on all sides to it too? to cover these cases

[gavin-ts]

should we add label.PADDING on all sides to it too? to cover these cases

good idea updated:

[alixander]

can you add @bo-ku-ra 's example as an e2e test? #823 (comment)

[gavin-ts]

can you add @bo-ku-ra 's example as an e2e test? #823 (comment)

[alixander]

oh interesting. so arrowhead label and shape can overlap. that's a different issue then, and layout engine agnostic. i'll change that issue to reflect