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

* fix(core): correct connection keys Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com> * chore(changeset): add Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com> --------- Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

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)