fix(dropdown): fix click exception when using v-for (#735)

CHANGELOG.en-US.md

@@ -13,6 +13,10 @@
 - `n-menu` add `render-extra` prop.
 - `n-select` add `on-clear` prop.
 
+### Fixes
+
+- Fix `n-dropdown` click exception when using v-for.
+
 ## 2.15.11 (2021-07-29)
 
 ### Fixes

CHANGELOG.zh-CN.md

@@ -13,6 +13,10 @@
 - `n-menu` 新增 `render-extra` 属性
 - `n-select` 新增 `on-clear` 属性
 
+### Fixes
+
+- 修复 `n-dropdown` 循环渲染时点击异常
+
 ## 2.15.11 (2021-07-29)
 
 ### Fixes

src/popover/src/Popover.ts

@@ -10,7 +10,8 @@ import {
   CSSProperties,
   ComputedRef,
   Ref,
-  toRef
+  toRef,
+  cloneVNode
 } from 'vue'
 import { VBinder, VTarget, FollowerPlacement } from 'vueuc'
 import { useMergedState, useCompitable, useIsMounted, useMemo } from 'vooks'
@@ -396,6 +397,7 @@ export default defineComponent({
         triggerVNode = getFirstSlotVNode(slots, 'trigger')
       }
       if (triggerVNode) {
+        triggerVNode = cloneVNode(triggerVNode)
         triggerVNode =
           triggerVNode.type === textVNodeType
             ? h('span', [triggerVNode])