fix(node-toolbar): set default value for isVisible to undefined (#1785)

* fix(node-toolbar): set default value for isVisible to undefined

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>

.changeset/olive-fishes-fetch.md

@@ -0,0 +1,5 @@
+---
+"@vue-flow/node-toolbar": patch
+---
+
+Set default value for `isVisible` to `undefined`

packages/node-toolbar/src/NodeToolbar.vue

@@ -1,5 +1,5 @@
 <script lang="ts" setup>
-import { computed, inject, toRef } from 'vue'
+import { computed, inject } from 'vue'
 import type { GraphNode, Rect, ViewportTransform } from '@vue-flow/core'
 import { NodeIdInjection, Position, getRectOfNodes, useVueFlow } from '@vue-flow/core'
 
@@ -10,6 +10,7 @@ const props = withDefaults(defineProps<NodeToolbarProps>(), {
   position: Position.Top,
   offset: 10,
   align: 'center',
+  isVisible: undefined,
 })
 
 const contextNodeId = inject(NodeIdInjection, null)
@@ -30,7 +31,7 @@ const nodes = computed(() => {
   }, [] as GraphNode[])
 })
 
-const isActive = toRef(() =>
+const isActive = computed(() =>
   typeof props.isVisible === 'boolean'
     ? props.isVisible
     : nodes.value.length === 1 && nodes.value[0].selected && getSelectedNodes.value.length === 1,