Revert to internal option

src/HtmlUtils.tsx

@@ -31,7 +31,6 @@ import katex from 'katex';
 import { AllHtmlEntities } from 'html-entities';
 import SettingsStore from './settings/SettingsStore';
 import cheerio from 'cheerio';
-import * as htmlparser2 from 'htmlparser2';
 
 import {tryTransformPermalinkToLocalHref} from "./utils/permalinks/Permalinks";
 import {SHORTCODE_TO_EMOJI, getEmojiFromUnicode} from "./emoji";
@@ -423,9 +422,12 @@ export function bodyToHtml(content: IContent, highlights: string[], opts: IOpts
             safeBody = sanitizeHtml(formattedBody, sanitizeParams);
 
             if (SettingsStore.getValue("feature_latex_maths")) {
-                const phtml = cheerio.load(htmlparser2.parseDocument(safeBody, {
+                const phtml = cheerio.load(safeBody, {
+                    // @ts-ignore: The `_useHtmlParser2` internal option is the
+                    // simplest way to both parse and render using `htmlparser2`.
+                    _useHtmlParser2: true,
                     decodeEntities: false,
-                }));
+                });
                 // @ts-ignore - The types for `replaceWith` wrongly expect
                 // Cheerio instance to be returned.
                 phtml('div, span[data-mx-maths!=""]').replaceWith(function(i, e) {