Add comment and delint

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/views/rooms/LinkPreviewWidget.js

@@ -19,7 +19,6 @@ import React, {createRef} from 'react';
 import PropTypes from 'prop-types';
 import createReactClass from 'create-react-class';
 import { AllHtmlEntities } from 'html-entities';
-
 import {linkifyElement} from '../../../HtmlUtils';
 import SettingsStore from "../../../settings/SettingsStore";
 import { _t } from "../../../languageHandler";
@@ -129,6 +128,10 @@ module.exports = createReactClass({
                   </div>;
         }
 
+        // The description includes &-encoded HTML entities, we decode those as React treats the thing as an
+        // opaque string. This does not allow any HTML to be injected into the DOM.
+        const description = AllHtmlEntities.decode(p["og:description"] || "");
+
         const AccessibleButton = sdk.getComponent('elements.AccessibleButton');
         return (
             <div className="mx_LinkPreviewWidget" >
@@ -137,7 +140,7 @@ module.exports = createReactClass({
                     <div className="mx_LinkPreviewWidget_title"><a href={this.props.link} target="_blank" rel="noopener">{ p["og:title"] }</a></div>
                     <div className="mx_LinkPreviewWidget_siteName">{ p["og:site_name"] ? (" - " + p["og:site_name"]) : null }</div>
                     <div className="mx_LinkPreviewWidget_description" ref={this._description}>
-                        { AllHtmlEntities.decode(p["og:description"] || "") }
+                        { description }
                     </div>
                 </div>
                 <AccessibleButton className="mx_LinkPreviewWidget_cancel" onClick={this.props.onCancelClick} aria-label={_t("Close preview")}>