fix(core): use connecting handle to update connection (#1996)

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

.changeset/giant-pants-jam.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/core": patch
+---
+
+Use the connecting handle result when updating a connection, so we get an accurate connection position for `toPosition`.

packages/core/src/composables/useHandle.ts

@@ -244,6 +244,7 @@ export function useHandle({
         }
 
         const connectingHandle = closestHandle ?? result.toHandle
+
         updateConnection(
           connectingHandle && isValid
             ? rendererPointToPoint(
@@ -254,7 +255,7 @@ export function useHandle({
                 viewport.value,
               )
             : connectionPosition,
-          result.toHandle,
+          connectingHandle,
           getConnectionStatus(!!connectingHandle, isValid),
         )