fix(core): correct connection keys (#1749)

* fix(core): correct connection keys

Signed-off-by: braks <[email protected]>

* chore(changeset): add

Signed-off-by: braks <[email protected]>

---------

Signed-off-by: braks <[email protected]>

Author: bcakmakoglu

.changeset/strong-buttons-wink.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/core": patch
+---
+
+Correct connection keys.

packages/core/src/utils/store.ts

@@ -171,8 +171,8 @@ export function updateConnectionLookup(connectionLookup: ConnectionLookup, edgeL
     const { source: sourceNode, target: targetNode, sourceHandle = null, targetHandle = null } = edge
 
     const connection = { edgeId: edge.id, source: sourceNode, target: targetNode, sourceHandle, targetHandle }
-    const sourceKey = `${sourceNode}-${sourceHandle}`
-    const targetKey = `${targetNode}-${targetHandle}`
+    const sourceKey = `${sourceNode}-${sourceHandle}--${targetNode}-${targetHandle}`
+    const targetKey = `${targetNode}-${targetHandle}--${sourceNode}-${sourceHandle}`
 
     addConnectionToLookup('source', connection, targetKey, connectionLookup, sourceNode, sourceHandle)
     addConnectionToLookup('target', connection, sourceKey, connectionLookup, targetNode, targetHandle)