MC-5622: Unable to input text into TinyMCE4 WYSIWYG area on IE11 in Catalog Product

Author: danielrenaud

app/code/Magento/Ui/view/base/web/js/form/element/wysiwyg.js

@@ -20,7 +20,7 @@ define([
     return Abstract.extend({
         defaults: {
             elementSelector: 'textarea',
-            suffixRegExpPattern: '\\${ \\$.wysiwygUniqueSuffix }',
+            suffixRegExpPattern: '${ $.wysiwygUniqueSuffix }',
             $wysiwygEditorButton: '',
             links: {
                 value: '${ $.provider }:${ $.dataScope }'
@@ -64,6 +64,7 @@ define([
         /** @inheritdoc */
         initConfig: function (config) {
             var pattern = config.suffixRegExpPattern || this.constructor.defaults.suffixRegExpPattern;
+            pattern = pattern.replace(/\$/g, '\\$&');
 
             config.content = config.content.replace(new RegExp(pattern, 'g'), this.getUniqueSuffix(config));
             this._super();

lib/web/mage/adminhtml/wysiwyg/tiny_mce/tinymce4Adapter.js

@@ -577,7 +577,7 @@ define([
          * Update text area.
          */
         updateTextArea: function () {
-            var editor = tinyMCE4.get(this.getId()),
+            var editor = this.activeEditor(),
                 content;
 
             if (!editor) {