fix: 解决 swiper 组件某些情况下渲染错误的问题 （question/89853）

src/core/view/components/swiper/index.vue

@@ -2,6 +2,24 @@
 <script>
 import touchtrack from 'uni-mixins/touchtrack'
 
+function deepClone (vnodes, createElement) {
+  function cloneVNode (vnode) {
+    var clonedChildren = vnode.children && vnode.children.map(cloneVNode)
+    var cloned = createElement(vnode.tag, vnode.data, clonedChildren)
+    cloned.text = vnode.text
+    cloned.isComment = vnode.isComment
+    cloned.componentOptions = vnode.componentOptions
+    cloned.elm = vnode.elm
+    cloned.context = vnode.context
+    cloned.ns = vnode.ns
+    cloned.isStatic = vnode.isStatic
+    cloned.key = vnode.key
+    return cloned
+  }
+
+  return vnodes.map(cloneVNode)
+}
+
 export default {
   name: 'Swiper',
   mixins: [touchtrack],
@@ -587,7 +605,7 @@ export default {
     var slidesDots = []
     var swiperItems = []
     if (this.$slots.default) {
-      this.$slots.default.forEach(vnode => {
+      deepClone(this.$slots.default, createElement).forEach(vnode => {
         if (vnode.componentOptions && vnode.componentOptions.tag === 'v-uni-swiper-item') {
           swiperItems.push(vnode)
         }