[IMP] web_editor: hide SnippetEditor when no options are shown

Commit [1] moved the switchable views inside a SnippetOption. The
implementation of that ended up creating empty page options
SnippetEditors displayed on every page.

This commit makes sure that if a SnippetEditor doesn't have any options,
it is not displayed.

[1]: https://github.com/odoo/odoo/commit/69af7dcfeb3ff95c40b00ef0cc7c5c0e4021f9d2

task-2687506

X-original-commit: 39d073ccafddf4b3fbe9ec9f5f11849d77c9bdaa
Part-of: odoo/odoo#101687

addons/web_editor/static/src/js/editor/snippets.editor.js

@@ -705,7 +705,13 @@ var SnippetEditor = Widget.extend({
         const proms = Object.values(this.styles).map(opt => {
             return opt.updateUIVisibility();
         });
-        return Promise.all(proms);
+        await Promise.all(proms);
+        // Hide the snippetEditor if none of its options are visible
+        // This cannot be done using the visibility of the options' UI
+        // because some options can be located in the overlay.
+        const $visibleOptions = this.$optionsSection.find('we-top-button-group, we-customizeblock-option')
+                .children(':not(.d-none)');
+        this.$optionsSection.toggleClass('d-none', !$visibleOptions.length);
     },
     /**
      * Clones the current snippet.

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -5133,17 +5133,6 @@ registry.SnippetMove = SnippetOptionWidget.extend({
 
         return this._super(...arguments);
     },
-    /**
-     * @override
-     */
-    onFocus: function () {
-        // TODO improve this: hack to hide options section if snippet move is
-        // the only one.
-        const $allOptions = this.$el.parent();
-        if ($allOptions.find('we-customizeblock-option').length <= 1) {
-            $allOptions.addClass('d-none');
-        }
-    },
 
     //--------------------------------------------------------------------------
     // Options