Prevent Default behavior of linking between 2 nodes

GoJS
1

I’m having a condition where 2 nodes cannot be connected more than once, due to which we show red border color while making a link, but in this case even if the mouse reaches the node near it identifies the detectable port that can be connected, but this behavior should only occur when i drag the link over the toNode not before that, here is an example of this behavior
image
I want to prevent the default behavior of getting attached to a nearby connectable port and let the user choose the port itself.

2

Is greatly reducing the value of LinkingTool.portGravity sufficient for your needs?

How are you showing that red color while the user is drawing a new link?

3

Thanks for your help