We’re not changing the behavior of any version 1.6.* for any such new feature.
Again, I’m asking why you cannot connect the links to specific ports rather than to the whole node. That will route the way that you want in all versions of GoJS.
I am trying to grab the link from port only. But I think some times the link starts from node. How to allow the link to always starts from specific port not from node?
Do you need the whole node to be a port? If not, do not set fromLinkable or toLinkable to true (or the cursor property) on the default port, the one marked with portId: "".