first commit

wp-content/plugins/email-subscribers/lite/admin/js/tinymce-plugins/custom/undo-style-to-img-tag-conversion/plugin.js

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+(function () {
+  var undo_style_to_image = (function () {
+      'use strict';
+
+      var global = tinymce.util.Tools.resolve('tinymce.PluginManager');
+
+        var Cell = function (initial) {
+          var value = initial;
+          var get = function () {
+            return value;
+          };
+          var set = function (v) {
+            value = v;
+          };
+          var clone = function () {
+            return Cell(get());
+          };
+          return {
+            get: get,
+            set: set,
+            clone: clone
+          };
+        };
+
+        var handleSetContent = function (editor, headState, footState, event) {
+          if ( event.content ) {
+            event.content = event.content.replace( /<img([\w\W]+?)[\/]?>/g, function( match, tag ) {
+             var imgElem  = jQuery.parseHTML(match);
+             var imgClass = jQuery(imgElem).attr('class');
+             var imgAlt   = jQuery(imgElem).attr('alt');
+             if ( 'mce-object' === imgClass && '<style>' === imgAlt ) {
+              var styleElem = jQuery(imgElem).attr('data-wp-preserve');
+              var style = decodeURIComponent(styleElem);
+              return style;
+             } else {
+               return match;
+             }
+            });
+          }
+        };
+
+        // add plugin code here
+        var setup = function (editor, headState, footState) {
+          if ( 'edit-es-broadcast-body' !== editor.id ) {
+            return;
+          }
+          
+          editor.on('BeforeSetContent', function (event) {
+            handleSetContent(editor, headState, footState, event);
+          });
+        };
+        var FilterContent = { setup: setup };
+
+        global.add('undo_style_to_image', function (editor) {
+          var headState = Cell(''), footState = Cell('');
+          FilterContent.setup(editor, headState, footState);
+        });
+  }());
+})();