ELK Edge Label is not positioned correctly

[BjBe82]

I just updated Sprotty to the newest version 1.4.0 (from 1.0.0) and noticed that the edge label position changed. I use ELK layered to layout everything.

Version 1.0.0:

Version 1.4.0

I just tried to reproduce this in the examples and the effect can be seen there too, as it looks like the edge label does not respect the x,y coordinates from ELK.

Plain ELK

Sprotty Example

#di.config.ts 
 configureModelElement(container, 'label:edge', SLabelImpl, SLabelView);

#standalone.ts
const NODES = 2;
const EDGES = 1;
....
        const edge: SEdge = {
            type: 'edge',
            id: `edge${i}`,
            sourceId: `port${sourceNo}-${i}`,
            targetId: `port${targetNo}-${i}`,
                        children: [
                <SLabel>{
                    type: 'label:edge',
                    id: `port${sourceNo}-${i}-->${targetNo}-${i}-label`,
                    text: `port${sourceNo}-${i}-->${targetNo}-${i}`
                }
            ]
        };

With two edges:

[KylarJFH]

Hello, I am not affiliated with elk or sprotty and have limited experience with either but I ran into a similar issue.
I found out that sprotty does something to the position of edge labels even though elk has already decided where to put them.
Adding { disable: [edgeLayoutFeature] } to the model config helped in my case.

In your given di.config.ts the line with the edge label config should look as follows.

configureModelElement(container, 'label:edge', SLabelImpl, SLabelView { disable: [edgeLayoutFeature] });

I hope this helps you, if you haven't already fixed the issue yourself.

[BjBe82]

@KylarJFH Thanks for the workaround. This solved my issue.