Revert "MD-escape URLs/alises/user IDs prior to parsing markdown"

src/Markdown.js

@@ -55,33 +55,14 @@ function is_multi_line(node) {
     return par.firstChild != par.lastChild;
 }
 
-import linkifyMatrix from './linkify-matrix';
-import * as linkify from 'linkifyjs';
-linkifyMatrix(linkify);
-
-// Thieved from draft-js-export-markdown
-function escapeMarkdown(s) {
-    return s.replace(/[*_`]/g, '\\$&');
-}
-
-// Replace URLs, room aliases and user IDs with md-escaped URLs
-function linkifyMarkdown(s) {
-    const links = linkify.find(s);
-    links.forEach((l) => {
-        // This may replace several instances of `l.value` at once, but that's OK
-        s = s.replace(l.value, escapeMarkdown(l.value));
-    });
-    return s;
-}
-
 /**
  * Class that wraps commonmark, adding the ability to see whether
  * a given message actually uses any markdown syntax or whether
  * it's plain text.
  */
 export default class Markdown {
     constructor(input) {
-        this.input = linkifyMarkdown(input);
+        this.input = input;
 
         const parser = new commonmark.Parser();
         this.parsed = parser.parse(this.input);