fix issues #2644 and #2662

browser/components/MarkdownPreview.js

@@ -398,6 +398,31 @@ export default class MarkdownPreview extends React.Component {
     }
   }
 
+  /**
+   * @description Convert special characters between three ```
+   * @param {string[]} splitWithCodeTag Array of HTML strings separated by three ```
+   * @returns {string} HTML in which special characters between three ``` have been converted
+   */
+  escapeHtmlCharactersInCodeTag (splitWithCodeTag) {
+    for (let index = 0; index < splitWithCodeTag.length; index++) {
+      const codeTagRequired = (splitWithCodeTag[index] !== '\`\`\`' && index < splitWithCodeTag.length - 1)
+      if (codeTagRequired) {
+        splitWithCodeTag.splice((index + 1), 0, '\`\`\`')
+      }
+    }
+    let inCodeTag = false
+    let result = ''
+    for (let content of splitWithCodeTag) {
+      if (content === '\`\`\`') {
+        inCodeTag = !inCodeTag
+      } else if (inCodeTag) {
+        content = escapeHtmlCharacters(content)
+      }
+      result += content
+    }
+    return result
+  }
+
   getScrollBarStyle () {
     const { theme } = this.props
 
@@ -632,11 +657,16 @@ export default class MarkdownPreview extends React.Component {
       indentSize,
       showCopyNotification,
       storagePath,
-      noteKey
+      noteKey,
+      sanitize
     } = this.props
     let { value, codeBlockTheme } = this.props
 
     this.refs.root.contentWindow.document.body.setAttribute('data-theme', theme)
+    if (sanitize === 'NONE') {
+      const splitWithCodeTag = value.split('```')
+      value = this.escapeHtmlCharactersInCodeTag(splitWithCodeTag)
+    }
     const renderedHTML = this.markdown.render(value)
     attachmentManagement.migrateAttachments(value, storagePath, noteKey)
     this.refs.root.contentWindow.document.body.innerHTML = attachmentManagement.fixLocalURLS(