refactor(edges): use internal id

src/EdgeRenderer/index.js

@@ -20,7 +20,7 @@ function renderEdge(e, props, graphContext) {
 
   return (
     <EdgeComponent
-      key={`${e.source}-${e.target}`}
+      key={e.id}
       id={e.id}
       type={e.type}
       sourceNode={sourceNode}

src/NodeRenderer/HandleTypes/BaseHandle.js

@@ -23,7 +23,6 @@ function onMouseDown(evt, { nodeId, dispatch, onConnect, isTarget }) {
         const targetId = elementBelow.getAttribute('data-nodeid');
         onConnect({ source: nodeId, target: targetId });
       }
-
     }
 
     dispatch(setConnecting({ connectionSourceId: false }));