when i use it with element.ui, it will disabled the submenu folding animate

[huzion]

the element.ui demo http://element.eleme.io/#/zh-CN/component/menu

I using this UI framework, and vue2-scrollbar, but the nav menu animate is stop.

<vue-scrollbar
    custom-class="my-scrollbar"
    ref="Scrollbar"
    :style="'height:' + menuHeight + 'px;'">
      <el-row class="tac">
  <el-col :span="8">
    <h5>带 icon</h5>
    <el-menu default-active="2" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose">
      <el-submenu index="1">
        <template slot="title"><i class="el-icon-message"></i>导航一</template>
        <el-menu-item-group>
          <template slot="title">分组一</template>
          <el-menu-item index="1-1">选项1</el-menu-item>
          <el-menu-item index="1-2">选项2</el-menu-item>
        </el-menu-item-group>
        <el-menu-item-group title="分组2">
          <el-menu-item index="1-3">选项3</el-menu-item>
        </el-menu-item-group>
        <el-submenu index="1-4">
          <template slot="title">选项4</template>
          <el-menu-item index="1-4-1">选项1</el-menu-item>
        </el-submenu>
      </el-submenu>
      <el-menu-item index="2"><i class="el-icon-menu"></i>导航二</el-menu-item>
      <el-menu-item index="3"><i class="el-icon-setting"></i>导航三</el-menu-item>
    </el-menu>
  </el-col>
  <el-col :span="8">
    <h5>不带 icon</h5>
    <el-menu default-active="2" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose" theme="dark">
      <el-submenu index="1">
        <template slot="title">导航一</template>
        <el-menu-item-group title="分组一">
          <el-menu-item index="1-1">选项1</el-menu-item>
          <el-menu-item index="1-2">选项2</el-menu-item>
        </el-menu-item-group>
        <el-menu-item-group title="分组2">
          <el-menu-item index="1-3">选项3</el-menu-item>
        </el-menu-item-group>
        <el-submenu index="1-4">
          <template slot="title">选项4</template>
          <el-menu-item index="1-4-1">选项1</el-menu-item>
        </el-submenu>
      </el-submenu>
      <el-menu-item index="2">导航二</el-menu-item>
      <el-menu-item index="3">导航三</el-menu-item>
    </el-menu>
  </el-col>
  <el-col :span="8">
    <h5>分组</h5>
    <el-menu mode="vertical" default-active="1" class="el-menu-vertical-demo">
      <el-menu-item-group title="分组一">
        <el-menu-item index="1"><i class="el-icon-message"></i>导航一</el-menu-item>
        <el-menu-item index="2"><i class="el-icon-message"></i>导航二</el-menu-item>
      </el-menu-item-group>
      <el-menu-item-group title="分组二">
        <el-menu-item index="3"><i class="el-icon-message"></i>导航三</el-menu-item>
        <el-menu-item index="4"><i class="el-icon-message"></i>导航四</el-menu-item>
      </el-menu-item-group>
    </el-menu>
  </el-col>
</el-row>
    </vue-scrollbar>

[BosNaufal]

Hi @huzion, I need some reproduce :/ you can make it via webpackbin.com or something.

[BosNaufal]

Hi @huzion, I've just realized that it's a bug. But it should be fixed now~
Thanks!
54292d3