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diff --git a/vendor/twbs/bootstrap/js/dist/util/backdrop.js b/vendor/twbs/bootstrap/js/dist/util/backdrop.js
new file mode 100644
index 000000000..b425c44c8
--- /dev/null
+++ b/vendor/twbs/bootstrap/js/dist/util/backdrop.js
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+/*!
+  * Bootstrap backdrop.js v5.2.0 (https://getbootstrap.com/)
+  * Copyright 2011-2022 The Bootstrap Authors (https://github.com/twbs/bootstrap/graphs/contributors)
+  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+  */
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('../dom/event-handler'), require('./index'), require('./config')) :
+  typeof define === 'function' && define.amd ? define(['../dom/event-handler', './index', './config'], factory) :
+  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.Backdrop = factory(global.EventHandler, global.Index, global.Config));
+})(this, (function (EventHandler, index, Config) { 'use strict';
+
+  const _interopDefaultLegacy = e => e && typeof e === 'object' && 'default' in e ? e : { default: e };
+
+  const EventHandler__default = /*#__PURE__*/_interopDefaultLegacy(EventHandler);
+  const Config__default = /*#__PURE__*/_interopDefaultLegacy(Config);
+
+  /**
+   * --------------------------------------------------------------------------
+   * Bootstrap (v5.2.0): util/backdrop.js
+   * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+   * --------------------------------------------------------------------------
+   */
+  /**
+   * Constants
+   */
+
+  const NAME = 'backdrop';
+  const CLASS_NAME_FADE = 'fade';
+  const CLASS_NAME_SHOW = 'show';
+  const EVENT_MOUSEDOWN = `mousedown.bs.${NAME}`;
+  const Default = {
+    className: 'modal-backdrop',
+    clickCallback: null,
+    isAnimated: false,
+    isVisible: true,
+    // if false, we use the backdrop helper without adding any element to the dom
+    rootElement: 'body' // give the choice to place backdrop under different elements
+
+  };
+  const DefaultType = {
+    className: 'string',
+    clickCallback: '(function|null)',
+    isAnimated: 'boolean',
+    isVisible: 'boolean',
+    rootElement: '(element|string)'
+  };
+  /**
+   * Class definition
+   */
+
+  class Backdrop extends Config__default.default {
+    constructor(config) {
+      super();
+      this._config = this._getConfig(config);
+      this._isAppended = false;
+      this._element = null;
+    } // Getters
+
+
+    static get Default() {
+      return Default;
+    }
+
+    static get DefaultType() {
+      return DefaultType;
+    }
+
+    static get NAME() {
+      return NAME;
+    } // Public
+
+
+    show(callback) {
+      if (!this._config.isVisible) {
+        index.execute(callback);
+        return;
+      }
+
+      this._append();
+
+      const element = this._getElement();
+
+      if (this._config.isAnimated) {
+        index.reflow(element);
+      }
+
+      element.classList.add(CLASS_NAME_SHOW);
+
+      this._emulateAnimation(() => {
+        index.execute(callback);
+      });
+    }
+
+    hide(callback) {
+      if (!this._config.isVisible) {
+        index.execute(callback);
+        return;
+      }
+
+      this._getElement().classList.remove(CLASS_NAME_SHOW);
+
+      this._emulateAnimation(() => {
+        this.dispose();
+        index.execute(callback);
+      });
+    }
+
+    dispose() {
+      if (!this._isAppended) {
+        return;
+      }
+
+      EventHandler__default.default.off(this._element, EVENT_MOUSEDOWN);
+
+      this._element.remove();
+
+      this._isAppended = false;
+    } // Private
+
+
+    _getElement() {
+      if (!this._element) {
+        const backdrop = document.createElement('div');
+        backdrop.className = this._config.className;
+
+        if (this._config.isAnimated) {
+          backdrop.classList.add(CLASS_NAME_FADE);
+        }
+
+        this._element = backdrop;
+      }
+
+      return this._element;
+    }
+
+    _configAfterMerge(config) {
+      // use getElement() with the default "body" to get a fresh Element on each instantiation
+      config.rootElement = index.getElement(config.rootElement);
+      return config;
+    }
+
+    _append() {
+      if (this._isAppended) {
+        return;
+      }
+
+      const element = this._getElement();
+
+      this._config.rootElement.append(element);
+
+      EventHandler__default.default.on(element, EVENT_MOUSEDOWN, () => {
+        index.execute(this._config.clickCallback);
+      });
+      this._isAppended = true;
+    }
+
+    _emulateAnimation(callback) {
+      index.executeAfterTransition(callback, this._getElement(), this._config.isAnimated);
+    }
+
+  }
+
+  return Backdrop;
+
+}));
+//# sourceMappingURL=backdrop.js.map