[FIX] IE11 - callback createTreeWalker doesnt accept acceptNode

app/emoji/client/emojiParser.js

@@ -3,6 +3,7 @@ import { Meteor } from 'meteor/meteor';
 import { Tracker } from 'meteor/tracker';
 
 import { getUserPreference } from '../../utils';
+import { isIE11 } from '../../ui-utils/client/lib/isIE11';
 import { callbacks } from '../../callbacks';
 import { emoji } from '../lib/rocketchat';
 
@@ -32,41 +33,44 @@ Tracker.autorun(() => {
 
 			const emojis = Array.from(checkEmojiOnly.querySelectorAll('.emoji:not(:empty), .emojione:not(:empty)'));
 
-			const walker = document.createTreeWalker(
-				checkEmojiOnly,
-				NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT,
-				{
-					acceptNode: (node) => {
-						if (node.nodeType === Node.ELEMENT_NODE && (
-							node.classList.contains('emojione')
-							|| node.classList.contains('emoji')
-						)) {
-							return NodeFilter.FILTER_REJECT;
-						}
-						return NodeFilter.FILTER_ACCEPT;
-					},
-				},
-			);
-
 			let hasText = false;
 
-			while (walker.nextNode()) {
-				if (walker.currentNode.nodeType === Node.TEXT_NODE && walker.currentNode.nodeValue.trim() !== '') {
-					hasText = true;
-					break;
+			if (!isIE11()) {
+				const filter = (node) => {
+					if (node.nodeType === Node.ELEMENT_NODE && (
+						node.classList.contains('emojione')
+							|| node.classList.contains('emoji')
+					)) {
+						return NodeFilter.FILTER_REJECT;
+					}
+					return NodeFilter.FILTER_ACCEPT;
+				};
+
+				const walker = document.createTreeWalker(
+					checkEmojiOnly,
+					NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT,
+					filter
+				);
+
+
+				while (walker.nextNode()) {
+					if (walker.currentNode.nodeType === Node.TEXT_NODE && walker.currentNode.nodeValue.trim() !== '') {
+						hasText = true;
+						break;
+					}
 				}
-			}
-
-			const emojiOnly = emojis.length && !hasText;
-
-			if (emojiOnly) {
-				for (let i = 0, len = emojis.length; i < len; i++) {
-					const { classList } = emojis[i];
-					classList.add('big');
+				const emojiOnly = emojis.length && !hasText;
+
+				if (emojiOnly) {
+					for (let i = 0, len = emojis.length; i < len; i++) {
+						const { classList } = emojis[i];
+						classList.add('big');
+					}
+					html = checkEmojiOnly.innerHTML;
 				}
-				html = checkEmojiOnly.innerHTML;
 			}
 
+
 			// apostrophe (') back to &#39;
 			html = html.replace(/\'/g, '&#39;');
 

app/markdown/lib/parser/original/markdown.js

@@ -23,7 +23,7 @@ const parseNotEscaped = function(msg, message) {
 		return token;
 	};
 
-	const schemes = settings.get('Markdown_SupportSchemesForLink').split(',').join('|');
+	const schemes = (settings.get('Markdown_SupportSchemesForLink') || '').split(',').join('|');
 
 	if (settings.get('Markdown_Headers')) {
 		// Support # Text for h1

app/ui-utils/client/lib/isIE11.js

@@ -0,0 +1,15 @@
+export const isIE11 = () => {
+	const { userAgent } = window.navigator;
+	const msieIdx = userAgent.indexOf('MSIE');
+
+	if (msieIdx > 0) {
+		return parseInt(userAgent.substring(msieIdx + 5, userAgent.indexOf('.', msieIdx))) === 11;
+	}
+
+	// If MSIE detection fails, check the Trident engine version
+	if (navigator.userAgent.match(/Trident\/7\./)) {
+		return true;
+	}
+
+	return false;
+};

imports/client/@rocket.chat/apps-engine

@@ -0,0 +1 @@
+../../../node_modules/@rocket.chat/apps-engine