fixed markdown preview not update when change snippet

ZeroX-DG · ZeroX-DG · commit 0d3ab7dde760 · 2019-02-16T14:55:19.000+13:00
diff --git a/browser/render/components/markdown-preview/markdown-preview.jsx b/browser/render/components/markdown-preview/markdown-preview.jsx
@@ -9,7 +9,16 @@ const baseMarkdownCSS = require('!!css-loader!./github-markdown.css') // eslint-
 
 class MarkdownPreview extends React.Component {
   componentDidMount () {
+    this.init()
+  }
+
+  componentDidUpdate () {
+    this.init()
+  }
+
+  init () {
     const previewDoc = this.refs.preview.contentWindow.document
+    previewDoc.body.innerHTML = ''
     previewDoc.write(this.buildHTML())
     this.initActions(previewDoc)
   }
