[FIX] web_editor: load odooEditor base style

Before this commit
The style for `li.oe-nested` was loaded only when the editor loaded.
The problem is that the style needs to be visible even when the editor
has never been loaded.

After this commit
The style for `li.oe-nested` is always loaded in the backend and in
the frontend.

Task-2793528

closes odoo/odoo#86817

X-original-commit: 6c26e24c3d52410c0a3a06ee9a9d0aad6858a438
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/__manifest__.py

@@ -86,6 +86,7 @@ Odoo Web Editor widget.
             'web_editor/static/src/js/wysiwyg/wysiwyg_iframe.js',
         ],
         'web.assets_common': [
+            'web_editor/static/lib/odoo-editor/src/base_style.css',
             'web_editor/static/lib/vkbeautify/**/*',
             'web_editor/static/src/js/common/**/*',
             'web_editor/static/lib/odoo-editor/src/utils/utils.js',

addons/web_editor/static/lib/odoo-editor/demo/index.html

@@ -14,6 +14,8 @@
         <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script>
         <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.1/css/all.min.css" integrity="sha512-+4zCK9k+qNFUR5X+cKL9EIR+ZOhtIloNl9GIKS57V1MyNsYpYcUrUeQc9vNfzsWfV28IaLL3i96P9sdNyeRssA==" crossorigin="anonymous"/>
 
+        <!-- Base style to be loaded without the editor -->
+        <link rel="stylesheet" href="../src/base_style.css"/>
         <!-- custom style -->
         <link rel="stylesheet" href="../src/style.css"/>
         <!-- Checklists are styled separately in Odoo -->

addons/web_editor/static/lib/odoo-editor/src/base_style.css

@@ -0,0 +1,3 @@
+li.oe-nested {
+    display: block;
+}

addons/web_editor/static/lib/odoo-editor/src/style.css

@@ -194,9 +194,6 @@
 }
 /* Content styling */
 
-li.oe-nested {
-    display: block;
-}
 .oe-commandbar-wrapper {
     position: absolute;
     z-index: 1051;

addons/web_editor/static/lib/odoo-editor/test/editor-test.html

@@ -7,6 +7,7 @@
 
         <title>Odoo Editor tests</title>
 
+        <link rel="stylesheet" href="../src/base_style.css"/>
         <link rel="stylesheet" href="../src/checklist.css"/>
         <link rel="stylesheet" href="lib/mocha.css" />
         <style type="text/css">