Fix render delay issue when component is reused

Author: wchbrad

package.json

@@ -1,7 +1,7 @@
 {
     "name": "@wchbrad/vue-easy-tree",
     "description": "A Vue.js project",
-    "version": "1.0.6",
+    "version": "1.0.7",
     "author": "wchbrad <[email protected]>",
     "license": "MIT",
     "private": false,

src/components/ve-tree.vue

@@ -20,9 +20,10 @@
       :items="dataList"
       :item-size="26"
       :buffer="50"
-      v-slot="{ item }"
+      v-slot="{ active,item }"
     >
       <ElTreeVirtualNode
+        v-if="active"
         style="height: 26px;"
         :node="item"
         :renderContent="renderContent"