Register default rich text features in wagtailcore rather than wagtailadmin

wagtail/admin/wagtail_hooks.py

@@ -189,7 +189,6 @@ def register_core_features(features):
             order=45,
         )
     )
-    features.default_features.append('hr')
 
     features.register_editor_plugin(
         'hallo', 'link',
@@ -198,30 +197,24 @@ def register_core_features(features):
             js=['wagtailadmin/js/hallo-plugins/hallo-wagtaillink.js'],
         )
     )
-    features.default_features.append('link')
 
     features.register_editor_plugin(
         'hallo', 'bold', HalloFormatPlugin(format_name='bold')
     )
-    features.default_features.append('bold')
 
     features.register_editor_plugin(
         'hallo', 'italic', HalloFormatPlugin(format_name='italic')
     )
-    features.default_features.append('italic')
 
     for element in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']:
         features.register_editor_plugin(
             'hallo', element, HalloHeadingPlugin(element=element)
         )
-    features.default_features.extend(['h2', 'h3', 'h4'])
 
     features.register_editor_plugin(
         'hallo', 'ol', HalloListPlugin(list_type='ordered')
     )
-    features.default_features.append('ol')
 
     features.register_editor_plugin(
         'hallo', 'ul', HalloListPlugin(list_type='unordered')
     )
-    features.default_features.append('ul')

wagtail/core/wagtail_hooks.py

@@ -31,3 +31,14 @@ def check_view_restrictions(page, request, serve_args, serve_kwargs):
 
             elif restriction.restriction_type in [PageViewRestriction.LOGIN, PageViewRestriction.GROUPS]:
                 return require_wagtail_login(next=request.get_full_path())
+
+
+@hooks.register('register_rich_text_features')
+def register_core_features(features):
+    features.default_features.append('hr')
+    features.default_features.append('link')
+    features.default_features.append('bold')
+    features.default_features.append('italic')
+    features.default_features.extend(['h2', 'h3', 'h4'])
+    features.default_features.append('ol')
+    features.default_features.append('ul')