title: vue.js keep-alive and event rendering
body: <p>I have 1 master component and 2 childs.
  In the master i do :</p>
  
  <pre><code>  &lt;keep-alive&gt;
      &lt;component :is="getChild" @onrender="childRender" /&gt;
    &lt;/keep-alive&gt;
  </code></pre>
  
  <p>So I switch from child 1 to child 2 and keep state of each.</p>
  
  <ul>
  <li>getChild switch child component (buttons... not the problem here).</li>
  <li>onrender is emit when child load</li>
  <li>childRender just write a console.log.</li>
  </ul>
  
  <p><strong>Problem</strong> : when we use keep-alive, the child component is not re-render and when i use onCreated or onMounted or onUpdated... nothing append and it's normal. So how catch a "render" event with keep-alive ?</p>
  
  <p>I know i can use a bus or a store like Vuex to keep state... but i don't want it if possible.</p>
  
  <p>Thanks.</p>