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diff --git a/addons/web_editor/static/src/js/base.js b/addons/web_editor/static/src/js/base.js
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+++ b/addons/web_editor/static/src/js/base.js
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+odoo.define('web_editor.base', function (require) {
+'use strict';
+
+// TODO this should be re-removed as soon as possible.
+
+var ajax = require('web.ajax');
+var session = require('web.session');
+
+var domReady = new Promise(function(resolve) {
+    $(resolve);
+});
+
+return {
+    /**
+     * Retrieves all the CSS rules which match the given parser (Regex).
+     *
+     * @param {Regex} filter
+     * @returns {Object[]} Array of CSS rules descriptions (objects). A rule is
+     *          defined by 3 values: 'selector', 'css' and 'names'. 'selector'
+     *          is a string which contains the whole selector, 'css' is a string
+     *          which contains the css properties and 'names' is an array of the
+     *          first captured groups for each selector part. E.g.: if the
+     *          filter is set to match .fa-* rules and capture the icon names,
+     *          the rule:
+     *              '.fa-alias1::before, .fa-alias2::before { hello: world; }'
+     *          will be retrieved as
+     *              {
+     *                  selector: '.fa-alias1::before, .fa-alias2::before',
+     *                  css: 'hello: world;',
+     *                  names: ['.fa-alias1', '.fa-alias2'],
+     *              }
+     */
+    cacheCssSelectors: {},
+    getCssSelectors: function (filter) {
+        if (this.cacheCssSelectors[filter]) {
+            return this.cacheCssSelectors[filter];
+        }
+        this.cacheCssSelectors[filter] = [];
+        var sheets = document.styleSheets;
+        for (var i = 0; i < sheets.length; i++) {
+            var rules;
+            try {
+                // try...catch because Firefox not able to enumerate
+                // document.styleSheets[].cssRules[] for cross-domain
+                // stylesheets.
+                rules = sheets[i].rules || sheets[i].cssRules;
+            } catch (e) {
+                console.warn("Can't read the css rules of: " + sheets[i].href, e);
+                continue;
+            }
+            if (!rules) {
+                continue;
+            }
+
+            for (var r = 0 ; r < rules.length ; r++) {
+                var selectorText = rules[r].selectorText;
+                if (!selectorText) {
+                    continue;
+                }
+                var selectors = selectorText.split(/\s*,\s*/);
+                var data = null;
+                for (var s = 0; s < selectors.length; s++) {
+                    var match = selectors[s].trim().match(filter);
+                    if (!match) {
+                        continue;
+                    }
+                    if (!data) {
+                        data = {
+                            selector: match[0],
+                            css: rules[r].cssText.replace(/(^.*\{\s*)|(\s*\}\s*$)/g, ''),
+                            names: [match[1]]
+                        };
+                    } else {
+                        data.selector += (', ' + match[0]);
+                        data.names.push(match[1]);
+                    }
+                }
+                if (data) {
+                    this.cacheCssSelectors[filter].push(data);
+                }
+            }
+        }
+        return this.cacheCssSelectors[filter];
+    },
+    /**
+     * List of font icons to load by editor. The icons are displayed in the media
+     * editor and identified like font and image (can be colored, spinned, resized
+     * with fa classes).
+     * To add font, push a new object {base, parser}
+     *
+     * - base: class who appear on all fonts
+     * - parser: regular expression used to select all font in css stylesheets
+     *
+     * @type Array
+     */
+    fontIcons: [{base: 'fa', parser: /\.(fa-(?:\w|-)+)::?before/i}],
+    /**
+     * Searches the fonts described by the @see fontIcons variable.
+     */
+    computeFonts: _.once(function () {
+        var self = this;
+        _.each(this.fontIcons, function (data) {
+            data.cssData = self.getCssSelectors(data.parser);
+            data.alias = _.flatten(_.map(data.cssData, _.property('names')));
+        });
+    }),
+    /**
+     * If a widget needs to be instantiated on page loading, it needs to wait
+     * for appropriate resources to be loaded. This function returns a Promise
+     * which is resolved when the dom is ready, the session is bound
+     * (translations loaded) and the XML is loaded. This should however not be
+     * necessary anymore as widgets should not be parentless and should then be
+     * instantiated (directly or not) by the page main component (webclient,
+     * website root, editor bar, ...). The DOM will be ready then, the main
+     * component is in charge of waiting for the session and the XML can be
+     * lazy loaded thanks to the @see Widget.xmlDependencies key.
+     *
+     * @returns {Promise}
+     */
+    ready: function () {
+        return Promise.all([domReady, session.is_bound, ajax.loadXML()]);
+    },
+};
+});
+
+//==============================================================================
+
+odoo.define('web_editor.context', function (require) {
+'use strict';
+
+// TODO this should be re-removed as soon as possible.
+
+function getContext(context) {
+    var html = document.documentElement;
+    return _.extend({
+        lang: (html.getAttribute('lang') || 'en_US').replace('-', '_'),
+
+        // Unfortunately this is a mention of 'website' in 'web_editor' as there
+        // was no other way to do it as this was restored in a stable version.
+        // Indeed, the editor is currently using this context at the root of JS
+        // module, so there is no way for website to hook itself before
+        // web_editor uses it (without a risky refactoring of web_editor in
+        // stable). As mentioned above, the editor should not use this context
+        // anymore anyway (this was restored by the saas-12.2 editor revert).
+        'website_id': html.getAttribute('data-website-id') | 0,
+    }, context || {});
+}
+function getExtraContext(context) {
+    var html = document.documentElement;
+    return _.extend(getContext(), {
+        editable: !!(html.dataset.editable || $('[data-oe-model]').length), // temporary hack, this should be done in python
+        translatable: !!html.dataset.translatable,
+        edit_translations: !!html.dataset.edit_translations,
+    }, context || {});
+}
+
+return {
+    get: getContext,
+    getExtra: getExtraContext,
+};
+});
+
+//==============================================================================
+
+odoo.define('web_editor.ready', function (require) {
+'use strict';
+
+// TODO this should be re-removed as soon as possible.
+
+var base = require('web_editor.base');
+
+return base.ready();
+});