Gate commenting behind feature flag

Register a commenting feature flag so commenting can be enabled
per account or entry. The loadCommenting seed flag is only set
when the feature is active, preventing commenting components
from loading otherwise.

REDMINE-21261

Author: tf

entry_types/scrolled/app/controllers/pageflow_scrolled/entries_controller.rb

@@ -23,20 +23,22 @@ def show
         locals: {
           entry:,
           entry_mode: mode,
-          seed_options: seed_options(mode)
+          seed_options: seed_options(entry, mode)
         }
       )
     end
 
     private
 
-    def seed_options(mode)
+    def seed_options(entry, mode)
       options = {
         embed: get_embed_from_env,
         origin_url: request.original_url
       }
 
-      options[:load_commenting] = true if mode == :preview
+      if mode == :preview && entry.feature_state('commenting')
+        options[:load_commenting] = true
+      end
 
       options
     end

entry_types/scrolled/config/locales/de.yml

@@ -1,5 +1,7 @@
 de:
   pageflow:
+    commenting:
+      feature_name: Kommentare
     datawrapper_chart_embed_opt_in:
       feature_name: Opt-in für Datawrapper Embeds
     image_srcset:

entry_types/scrolled/config/locales/en.yml

@@ -1,5 +1,7 @@
 en:
   pageflow:
+    commenting:
+      feature_name: Comments
     datawrapper_chart_embed_opt_in:
       feature_name: Opt-in for Datawrapper embeds
     image_srcset:

entry_types/scrolled/lib/pageflow_scrolled/plugin.rb

@@ -213,6 +213,7 @@ def configure(config)
         c.features.register('custom_palette_colors')
         c.features.register('decoration_effects')
         c.features.register('backdrop_size')
+        c.features.register('commenting')
         c.features.register('image_srcset')
         c.features.enable_by_default('image_srcset')
 

entry_types/scrolled/spec/controllers/pageflow_scrolled/entries_controller_spec.rb

@@ -189,17 +189,27 @@ module PageflowScrolled
         expect(response.body).to include('"originUrl":"http://test.host/test/entry"')
       end
 
-      it 'includes loadCommenting flag in preview mode' do
-        entry = create(:entry, :published, type_name: 'scrolled')
+      it 'includes loadCommenting flag in preview mode when feature is enabled' do
+        entry = create(:entry, :published, type_name: 'scrolled',
+                                           with_feature: 'commenting')
 
         get_with_entry_env(:show, entry:, mode: :preview)
 
         expect(response.body).to include('"loadCommenting":true')
       end
 
-      it 'does not include loadCommenting flag in published mode' do
+      it 'does not include loadCommenting flag in preview mode when feature is disabled' do
         entry = create(:entry, :published, type_name: 'scrolled')
 
+        get_with_entry_env(:show, entry:, mode: :preview)
+
+        expect(response.body).not_to include('"loadCommenting"')
+      end
+
+      it 'does not include loadCommenting flag in published mode' do
+        entry = create(:entry, :published, type_name: 'scrolled',
+                                           with_feature: 'commenting')
+
         get_with_entry_env(:show, entry:)
 
         expect(response.body).not_to include('"loadCommenting"')