[FIX] web_editor,website: top menu edition

Ensure all the `#top_menu` links are unremovable.
This prevent the editor to merge two `<a>` elements together
during delete commands.

task-2967314

closes odoo/odoo#99966

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/editor/odoo-editor/src/OdooEditor.js

@@ -220,6 +220,7 @@ export class OdooEditor extends EventTarget {
                 showEmptyElementHint: true,
                 defaultLinkAttributes: {},
                 plugins: [],
+                getUnremovableElements: () => [],
                 getReadOnlyAreas: () => [],
                 getContentEditableAreas: () => [],
                 getPowerboxElement: () => {
@@ -1947,6 +1948,9 @@ export class OdooEditor extends EventTarget {
         for (const node of this.options.getReadOnlyAreas()) {
             node.setAttribute('contenteditable', false);
         }
+        for (const element of this.options.getUnremovableElements()) {
+            element.classList.add("oe_unremovable");
+        }
         this.observerActive('_activateContenteditable');
     }
     _stopContenteditable() {

addons/web_editor/static/src/js/wysiwyg/wysiwyg.js

@@ -169,6 +169,7 @@ const Wysiwyg = Widget.extend({
             controlHistoryFromDocument: this.options.controlHistoryFromDocument,
             getContentEditableAreas: this.options.getContentEditableAreas,
             getReadOnlyAreas: this.options.getReadOnlyAreas,
+            getUnremovableElements: this.options.getUnremovableElements,
             defaultLinkAttributes: this.options.userGeneratedContent ? {rel: 'ugc' } : {},
             allowCommandVideo: this.options.allowCommandVideo,
             getYoutubeVideoElement: getYoutubeVideoElement,

addons/website/static/src/components/wysiwyg_adapter/wysiwyg_adapter.js

@@ -278,6 +278,7 @@ export class WysiwygAdapterComponent extends ComponentAdapter {
             bindLinkTool: true,
             showEmptyElementHint: false,
             getReadOnlyAreas: this._getReadOnlyAreas.bind(this),
+            getUnremovableElements: this._getUnremovableElements.bind(this),
             ...this.props.wysiwygOptions,
         };
     }
@@ -358,6 +359,9 @@ export class WysiwygAdapterComponent extends ComponentAdapter {
     _getReadOnlyAreas() {
         return [];
     }
+    _getUnremovableElements () {
+        return this.$editable[0].querySelectorAll("#top_menu a:not(.oe_unremovable)");
+    }
     /**
      * This method provides support for the legacy event system.
      * The supported events are defined in the prototype.