diff -r be944660c56a -r 3d72ae0968f4 wp/wp-includes/js/backbone.js
--- a/wp/wp-includes/js/backbone.js	Wed Sep 21 18:19:35 2022 +0200
+++ b/wp/wp-includes/js/backbone.js	Tue Sep 27 16:37:53 2022 +0200
@@ -1,6 +1,6 @@
-//     Backbone.js 1.4.0
+//     Backbone.js 1.4.1
 
-//     (c) 2010-2019 Jeremy Ashkenas and DocumentCloud
+//     (c) 2010-2022 Jeremy Ashkenas and DocumentCloud
 //     Backbone may be freely distributed under the MIT license.
 //     For all details and documentation:
 //     http://backbonejs.org
@@ -44,7 +44,7 @@
   var slice = Array.prototype.slice;
 
   // Current version of the library. Keep in sync with `package.json`.
-  Backbone.VERSION = '1.4.0';
+  Backbone.VERSION = '1.4.1';
 
   // For Backbone's purposes, jQuery, Zepto, Ender, or My Library (kidding) owns
   // the `$` variable.
@@ -516,7 +516,11 @@
       }
 
       // Update the `id`.
-      if (this.idAttribute in attrs) this.id = this.get(this.idAttribute);
+      if (this.idAttribute in attrs) {
+        var prevId = this.id;
+        this.id = this.get(this.idAttribute);
+        this.trigger('changeId', this, prevId, options);
+      }
 
       // Trigger all relevant attribute changes.
       if (!silent) {
@@ -994,7 +998,7 @@
     get: function(obj) {
       if (obj == null) return void 0;
       return this._byId[obj] ||
-        this._byId[this.modelId(this._isModel(obj) ? obj.attributes : obj)] ||
+        this._byId[this.modelId(this._isModel(obj) ? obj.attributes : obj, obj.idAttribute)] ||
         obj.cid && this._byId[obj.cid];
     },
 
@@ -1098,8 +1102,8 @@
     },
 
     // Define how to uniquely identify models in the collection.
-    modelId: function(attrs) {
-      return attrs[this.model.prototype.idAttribute || 'id'];
+    modelId: function(attrs, idAttribute) {
+      return attrs[idAttribute || this.model.prototype.idAttribute || 'id'];
     },
 
     // Get an iterator of all models in this collection.
@@ -1134,7 +1138,15 @@
       }
       options = options ? _.clone(options) : {};
       options.collection = this;
-      var model = new this.model(attrs, options);
+
+      var model;
+      if (this.model.prototype) {
+        model = new this.model(attrs, options);
+      } else {
+        // ES class methods didn't have prototype
+        model = this.model(attrs, options);
+      }
+
       if (!model.validationError) return model;
       this.trigger('invalid', this, model.validationError, options);
       return false;
@@ -1154,7 +1166,7 @@
         // Remove references before triggering 'remove' event to prevent an
         // infinite loop. #3693
         delete this._byId[model.cid];
-        var id = this.modelId(model.attributes);
+        var id = this.modelId(model.attributes, model.idAttribute);
         if (id != null) delete this._byId[id];
 
         if (!options.silent) {
@@ -1177,7 +1189,7 @@
     // Internal method to create a model's ties to a collection.
     _addReference: function(model, options) {
       this._byId[model.cid] = model;
-      var id = this.modelId(model.attributes);
+      var id = this.modelId(model.attributes, model.idAttribute);
       if (id != null) this._byId[id] = model;
       model.on('all', this._onModelEvent, this);
     },
@@ -1185,7 +1197,7 @@
     // Internal method to sever a model's ties to a collection.
     _removeReference: function(model, options) {
       delete this._byId[model.cid];
-      var id = this.modelId(model.attributes);
+      var id = this.modelId(model.attributes, model.idAttribute);
       if (id != null) delete this._byId[id];
       if (this === model.collection) delete model.collection;
       model.off('all', this._onModelEvent, this);
@@ -1199,13 +1211,11 @@
       if (model) {
         if ((event === 'add' || event === 'remove') && collection !== this) return;
         if (event === 'destroy') this.remove(model, options);
-        if (event === 'change') {
-          var prevId = this.modelId(model.previousAttributes());
-          var id = this.modelId(model.attributes);
-          if (prevId !== id) {
-            if (prevId != null) delete this._byId[prevId];
-            if (id != null) this._byId[id] = model;
-          }
+        if (event === 'changeId') {
+          var prevId = this.modelId(model.previousAttributes(), model.idAttribute);
+          var id = this.modelId(model.attributes, model.idAttribute);
+          if (prevId != null) delete this._byId[prevId];
+          if (id != null) this._byId[id] = model;
         }
       }
       this.trigger.apply(this, arguments);
@@ -1261,7 +1271,7 @@
         if (this._kind === ITERATOR_VALUES) {
           value = model;
         } else {
-          var id = this._collection.modelId(model.attributes);
+          var id = this._collection.modelId(model.attributes, model.idAttribute);
           if (this._kind === ITERATOR_KEYS) {
             value = id;
           } else { // ITERATOR_KEYSVALUES
@@ -1615,11 +1625,11 @@
 
   // Map from CRUD to HTTP for our default `Backbone.sync` implementation.
   var methodMap = {
-    create: 'POST',
-    update: 'PUT',
-    patch: 'PATCH',
-    delete: 'DELETE',
-    read: 'GET'
+    'create': 'POST',
+    'update': 'PUT',
+    'patch': 'PATCH',
+    'delete': 'DELETE',
+    'read': 'GET'
   };
 
   // Set the default implementation of `Backbone.ajax` to proxy through to `$`.
@@ -1712,11 +1722,11 @@
     // against the current location hash.
     _routeToRegExp: function(route) {
       route = route.replace(escapeRegExp, '\\$&')
-        .replace(optionalParam, '(?:$1)?')
-        .replace(namedParam, function(match, optional) {
-          return optional ? match : '([^/?]+)';
-        })
-        .replace(splatParam, '([^?]*?)');
+      .replace(optionalParam, '(?:$1)?')
+      .replace(namedParam, function(match, optional) {
+        return optional ? match : '([^/?]+)';
+      })
+      .replace(splatParam, '([^?]*?)');
       return new RegExp('^' + route + '(?:\\?([\\s\\S]*))?$');
     },