I have some problems with displaying edges.

I have difficulties to reproduce things outside my application. But I am trying to add arrows. So when I do:

(RTLine new color: Color red) + (RTSimpleArrowHead new color: Color red),

the text that follow the + brake my visualization: the arrow is wrongly placed.

If I remove the + (RTSimpleArrowHead new color: Color red), it works fine.

When I tried to reproduce it, I created an example that does not work, I do not understand why:

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