fix(core): disable drag when using multi-touch (#1448)

* fix(core): disable drag when using multi-touch

* chore(changeset): add

.changeset/selfish-vans-report.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/core": patch
+---
+
+Disable dragging when using multi-touch

packages/core/src/composables/useDrag.ts

@@ -185,6 +185,10 @@ export function useDrag(params: UseDragParams) {
   }
 
   const eventStart = (event: UseDragEvent, nodeEl: Element) => {
+    if (event.sourceEvent.type === 'touchmove' && event.sourceEvent.touches.length > 1) {
+      return
+    }
+
     if (nodeDragThreshold.value === 0) {
       startDrag(event, nodeEl)
     }