Adding the ability to detect if two nodes collide

[LakhderAmine99]

I suggest adding the ability to detect if two nodes collide when dragging one to the other.

I'm working on graph project, and i want to be able to drag certain nodes and when drop i drop them over another node, i want a certain action to happen, and this will require finding if the two nodes collides or not to figure out if the action will be performed or not I hope this will be useful, Thanks!