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diff --git a/wp-includes/js/tinymce/plugins/compat3x/plugin.js b/wp-includes/js/tinymce/plugins/compat3x/plugin.js
new file mode 100644
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+++ b/wp-includes/js/tinymce/plugins/compat3x/plugin.js
@@ -0,0 +1,322 @@
+/**
+ * plugin.js
+ *
+ * Released under LGPL License.
+ * Copyright (c) 1999-2017 Ephox Corp. All rights reserved
+ *
+ * License: http://www.tinymce.com/license
+ * Contributing: http://www.tinymce.com/contributing
+ */
+
+/*global tinymce:true, console:true */
+/*eslint no-console:0, new-cap:0 */
+
+/**
+ * This plugin adds missing events form the 4.x API back. Not every event is
+ * properly supported but most things should work.
+ *
+ * Unsupported things:
+ *  - No editor.onEvent
+ *  - Can't cancel execCommands with beforeExecCommand
+ */
+(function (tinymce) {
+  var reported;
+
+  function noop() {
+  }
+
+  function log(apiCall) {
+    if (!reported && window && window.console) {
+      reported = true;
+      console.log("Deprecated TinyMCE API call: " + apiCall);
+    }
+  }
+
+  function Dispatcher(target, newEventName, argsMap, defaultScope) {
+    target = target || this;
+    var cbs = [];
+
+    if (!newEventName) {
+      this.add = this.addToTop = this.remove = this.dispatch = noop;
+      return;
+    }
+
+    this.add = function (callback, scope, prepend) {
+      log('<target>.on' + newEventName + ".add(..)");
+
+      // Convert callback({arg1:x, arg2:x}) -> callback(arg1, arg2)
+      function patchedEventCallback(e) {
+        var callbackArgs = [];
+
+        if (typeof argsMap == "string") {
+          argsMap = argsMap.split(" ");
+        }
+
+        if (argsMap && typeof argsMap !== "function") {
+          for (var i = 0; i < argsMap.length; i++) {
+            callbackArgs.push(e[argsMap[i]]);
+          }
+        }
+
+        if (typeof argsMap == "function") {
+          callbackArgs = argsMap(newEventName, e, target);
+          if (!callbackArgs) {
+            return;
+          }
+        }
+
+        if (!argsMap) {
+          callbackArgs = [e];
+        }
+
+        callbackArgs.unshift(defaultScope || target);
+
+        if (callback.apply(scope || defaultScope || target, callbackArgs) === false) {
+          e.stopImmediatePropagation();
+        }
+      }
+
+      target.on(newEventName, patchedEventCallback, prepend);
+
+      var handlers = {
+        original: callback,
+        patched: patchedEventCallback
+      };
+
+      cbs.push(handlers);
+      return patchedEventCallback;
+    };
+
+    this.addToTop = function (callback, scope) {
+      this.add(callback, scope, true);
+    };
+
+    this.remove = function (callback) {
+      cbs.forEach(function (item, i) {
+        if (item.original === callback) {
+          cbs.splice(i, 1);
+          return target.off(newEventName, item.patched);
+        }
+      });
+
+      return target.off(newEventName, callback);
+    };
+
+    this.dispatch = function () {
+      target.fire(newEventName);
+      return true;
+    };
+  }
+
+  tinymce.util.Dispatcher = Dispatcher;
+  tinymce.onBeforeUnload = new Dispatcher(tinymce, "BeforeUnload");
+  tinymce.onAddEditor = new Dispatcher(tinymce, "AddEditor", "editor");
+  tinymce.onRemoveEditor = new Dispatcher(tinymce, "RemoveEditor", "editor");
+
+  tinymce.util.Cookie = {
+    get: noop, getHash: noop, remove: noop, set: noop, setHash: noop
+  };
+
+  function patchEditor(editor) {
+
+    function translate(str) {
+      var prefix = editor.settings.language || "en";
+      var prefixedStr = [prefix, str].join('.');
+      var translatedStr = tinymce.i18n.translate(prefixedStr);
+
+      return prefixedStr !== translatedStr ? translatedStr : tinymce.i18n.translate(str);
+    }
+
+    function patchEditorEvents(oldEventNames, argsMap) {
+      tinymce.each(oldEventNames.split(" "), function (oldName) {
+        editor["on" + oldName] = new Dispatcher(editor, oldName, argsMap);
+      });
+    }
+
+    function convertUndoEventArgs(type, event, target) {
+      return [
+        event.level,
+        target
+      ];
+    }
+
+    function filterSelectionEvents(needsSelection) {
+      return function (type, e) {
+        if ((!e.selection && !needsSelection) || e.selection == needsSelection) {
+          return [e];
+        }
+      };
+    }
+
+    if (editor.controlManager) {
+      return;
+    }
+
+    function cmNoop() {
+      var obj = {}, methods = 'add addMenu addSeparator collapse createMenu destroy displayColor expand focus ' +
+        'getLength hasMenus hideMenu isActive isCollapsed isDisabled isRendered isSelected mark ' +
+        'postRender remove removeAll renderHTML renderMenu renderNode renderTo select selectByIndex ' +
+        'setActive setAriaProperty setColor setDisabled setSelected setState showMenu update';
+
+      log('editor.controlManager.*');
+
+      function _noop() {
+        return cmNoop();
+      }
+
+      tinymce.each(methods.split(' '), function (method) {
+        obj[method] = _noop;
+      });
+
+      return obj;
+    }
+
+    editor.controlManager = {
+      buttons: {},
+
+      setDisabled: function (name, state) {
+        log("controlManager.setDisabled(..)");
+
+        if (this.buttons[name]) {
+          this.buttons[name].disabled(state);
+        }
+      },
+
+      setActive: function (name, state) {
+        log("controlManager.setActive(..)");
+
+        if (this.buttons[name]) {
+          this.buttons[name].active(state);
+        }
+      },
+
+      onAdd: new Dispatcher(),
+      onPostRender: new Dispatcher(),
+
+      add: function (obj) {
+        return obj;
+      },
+      createButton: cmNoop,
+      createColorSplitButton: cmNoop,
+      createControl: cmNoop,
+      createDropMenu: cmNoop,
+      createListBox: cmNoop,
+      createMenuButton: cmNoop,
+      createSeparator: cmNoop,
+      createSplitButton: cmNoop,
+      createToolbar: cmNoop,
+      createToolbarGroup: cmNoop,
+      destroy: noop,
+      get: noop,
+      setControlType: cmNoop
+    };
+
+    patchEditorEvents("PreInit BeforeRenderUI PostRender Load Init Remove Activate Deactivate", "editor");
+    patchEditorEvents("Click MouseUp MouseDown DblClick KeyDown KeyUp KeyPress ContextMenu Paste Submit Reset");
+    patchEditorEvents("BeforeExecCommand ExecCommand", "command ui value args"); // args.terminate not supported
+    patchEditorEvents("PreProcess PostProcess LoadContent SaveContent Change");
+    patchEditorEvents("BeforeSetContent BeforeGetContent SetContent GetContent", filterSelectionEvents(false));
+    patchEditorEvents("SetProgressState", "state time");
+    patchEditorEvents("VisualAid", "element hasVisual");
+    patchEditorEvents("Undo Redo", convertUndoEventArgs);
+
+    patchEditorEvents("NodeChange", function (type, e) {
+      return [
+        editor.controlManager,
+        e.element,
+        editor.selection.isCollapsed(),
+        e
+      ];
+    });
+
+    var originalAddButton = editor.addButton;
+    editor.addButton = function (name, settings) {
+      var originalOnPostRender;
+
+      function patchedPostRender() {
+        editor.controlManager.buttons[name] = this;
+
+        if (originalOnPostRender) {
+          return originalOnPostRender.apply(this, arguments);
+        }
+      }
+
+      for (var key in settings) {
+        if (key.toLowerCase() === "onpostrender") {
+          originalOnPostRender = settings[key];
+          settings.onPostRender = patchedPostRender;
+        }
+      }
+
+      if (!originalOnPostRender) {
+        settings.onPostRender = patchedPostRender;
+      }
+
+      if (settings.title) {
+        settings.title = translate(settings.title);
+      }
+
+      return originalAddButton.call(this, name, settings);
+    };
+
+    editor.on('init', function () {
+      var undoManager = editor.undoManager, selection = editor.selection;
+
+      undoManager.onUndo = new Dispatcher(editor, "Undo", convertUndoEventArgs, null, undoManager);
+      undoManager.onRedo = new Dispatcher(editor, "Redo", convertUndoEventArgs, null, undoManager);
+      undoManager.onBeforeAdd = new Dispatcher(editor, "BeforeAddUndo", null, undoManager);
+      undoManager.onAdd = new Dispatcher(editor, "AddUndo", null, undoManager);
+
+      selection.onBeforeGetContent = new Dispatcher(editor, "BeforeGetContent", filterSelectionEvents(true), selection);
+      selection.onGetContent = new Dispatcher(editor, "GetContent", filterSelectionEvents(true), selection);
+      selection.onBeforeSetContent = new Dispatcher(editor, "BeforeSetContent", filterSelectionEvents(true), selection);
+      selection.onSetContent = new Dispatcher(editor, "SetContent", filterSelectionEvents(true), selection);
+    });
+
+    editor.on('BeforeRenderUI', function () {
+      var windowManager = editor.windowManager;
+
+      windowManager.onOpen = new Dispatcher();
+      windowManager.onClose = new Dispatcher();
+      windowManager.createInstance = function (className, a, b, c, d, e) {
+        log("windowManager.createInstance(..)");
+
+        var constr = tinymce.resolve(className);
+        return new constr(a, b, c, d, e);
+      };
+    });
+  }
+
+  tinymce.on('SetupEditor', function (e) {
+    patchEditor(e.editor);
+  });
+
+  tinymce.PluginManager.add("compat3x", patchEditor);
+
+  tinymce.addI18n = function (prefix, o) {
+    var I18n = tinymce.util.I18n, each = tinymce.each;
+
+    if (typeof prefix == "string" && prefix.indexOf('.') === -1) {
+      I18n.add(prefix, o);
+      return;
+    }
+
+    if (!tinymce.is(prefix, 'string')) {
+      each(prefix, function (o, lc) {
+        each(o, function (o, g) {
+          each(o, function (o, k) {
+            if (g === 'common') {
+              I18n.data[lc + '.' + k] = o;
+            } else {
+              I18n.data[lc + '.' + g + '.' + k] = o;
+            }
+          });
+        });
+      });
+    } else {
+      each(o, function (o, k) {
+        I18n.data[prefix + '.' + k] = o;
+      });
+    }
+  };
+})(tinymce);