Multi-line labels overlap

[orange-buffalo]

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We have a diagram with multi-line labels and face two overlapping issues (TALA layout engine).

Labels overlapping other arrows

This can be reproduced in the playground:

Note that the labels are placed on top of relations they don't belong to. It makes it very hard to understand what labels actually annotate.

Labels overlapping each other

This can be reproduced in the playground:

Note one label is placed on top of another.