Emoji:

- Patch twemoji.js to prevent infinite loop.
- Fix some `undefined` errors in old IE.
Props iseulde. See #31242.

git-svn-id: https://develop.svn.wordpress.org/trunk@31756 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/js/twemoji.js

@@ -370,10 +370,10 @@ twemoji = (function (
           }
         }
         fragment.appendChild(img || createText(alt));
-        img = null;
       }
       // is there actually anything to replace in here ?
-      if (0 < i) {
+      if (img) {
+      	img = null;
         // any text left to be added ?
         if (i < text.length) {
           fragment.appendChild(
@@ -516,4 +516,4 @@ twemoji = (function (
     return r.join(sep || '-');
   }
 
-}());
+}());

src/wp-includes/js/wp-emoji.js

@@ -1,6 +1,8 @@
 window.wp = window.wp || {};
 
 ( function( window, wp, twemoji, settings ) {
+	var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver;
+
 	var emoji = {
 		/**
 		 * Flag to determine if we should parse all emoji characters into Twemoji images.
@@ -68,7 +70,7 @@ window.wp = window.wp || {};
 								node = node.parentNode;
 							}
 
-							if ( node.nodeType === 1 ) {
+							if ( node && node.nodeType === 1 ) {
 								emoji.parse( node );
 							}
 						}
@@ -95,7 +97,7 @@ window.wp = window.wp || {};
 			var canvas = document.createElement( 'canvas' ),
 				context = canvas.getContext && canvas.getContext( '2d' );
 
-			if ( ! context.fillText ) {
+			if ( ! context || ! context.fillText ) {
 				return false;
 			}
 
@@ -123,7 +125,7 @@ window.wp = window.wp || {};
 			var canvas = document.createElement( 'canvas' ),
 				context = canvas.getContext && canvas.getContext( '2d' );
 
-			if ( ! context.fillText ) {
+			if ( ! context || ! context.fillText ) {
 				return false;
 			}
 

src/wp-includes/script-loader.php

@@ -434,7 +434,7 @@ function wp_default_scripts( &$scripts ) {
 		 *
 		 * @param string The emoji base URL.
 		 */
-		'baseUrl' => apply_filters( 'emoji_url', '//s0.wp.com/wp-content/mu-plugins/emoji/twemoji/72x72/' ),
+		'baseUrl' => apply_filters( 'emoji_url', '//s0.wp.com/wp-content/mu-plugins/emoji/twemoji/72x72' ),
 		/**
 		 * Filter the extension of the emoji files.
 		 *