Strip MD mentions from the `body` of sent messages

Because previously we just sent the display name and MD links are not very readable.

src/components/views/rooms/MessageComposerInput.js

@@ -45,8 +45,9 @@ import ComposerHistoryManager from '../../../ComposerHistoryManager';
 import MessageComposerStore from '../../../stores/MessageComposerStore';
 import { getDisplayAliasForRoom } from '../../../Rooms';
 
-import {MATRIXTO_URL_PATTERN} from '../../../linkify-matrix';
+import {MATRIXTO_URL_PATTERN, MATRIXTO_MD_LINK_PATTERN} from '../../../linkify-matrix';
 const REGEX_MATRIXTO = new RegExp(MATRIXTO_URL_PATTERN);
+const REGEX_MATRIXTO_MARKDOWN_GLOBAL = new RegExp(MATRIXTO_MD_LINK_PATTERN, 'g');
 
 import {asciiRegexp, shortnameToUnicode, emojioneList, asciiList, mapUnicodeToShort} from 'emojione';
 const EMOJI_SHORTNAMES = Object.keys(emojioneList);
@@ -778,6 +779,13 @@ export default class MessageComposerInput extends React.Component {
             sendTextFn = this.client.sendEmoteMessage;
         }
 
+        // Strip MD user mentions to preserve plaintext mention behaviour
+        // (MD links are very verbose and ugly)
+        contentText = contentText.replace(REGEX_MATRIXTO_MARKDOWN_GLOBAL,
+        (markdownLink, text, resource, prefix) => {
+            return prefix === '@' ? text : markdownLink;
+        });
+
         let sendMessagePromise;
         if (contentHTML) {
             sendMessagePromise = sendHtmlFn.call(

src/linkify-matrix.js

@@ -168,6 +168,8 @@ matrixLinkify.VECTOR_URL_PATTERN = "^(?:https?:\/\/)?(?:"
     + ")(#.*)";
 
 matrixLinkify.MATRIXTO_URL_PATTERN = "^(?:https?:\/\/)?(?:www\\.)?matrix\\.to/#/((#|@|!).*)";
+matrixLinkify.MATRIXTO_MD_LINK_PATTERN =
+    '\\[([^\\]]*)\\]\\((?:https?:\/\/)?(?:www\\.)?matrix\\.to/#/((#|@|!)[^\\)]*)\\)';
 matrixLinkify.MATRIXTO_BASE_URL= "https://matrix.to";
 
 matrixLinkify.options = {