Make edges point to borders of nodes rather than the center

[mt-empty]

I would like to change edge style from:

To this:

Reason: having multiple edges with different decorators pointing to the center of a symbol makes very difficult to tell them apart. For example: can you tell which one is incoming and which one is outgoing here:

I couldn't find any option in my .odesign. So I dug deeper and I think (Sprotty)[https://github.com/eclipse/sprotty] is responsible(I checked their documentations, but couldn't find anything related to this).

Is there an easy way to change this?

[mt-empty]

Sorry, I think it belongs to sirius-component, I will report it there

[mt-empty]

Already reported #286