FIX: Show related topics when scrolling long topics (#111)

* FIX: Show related topics when scrolling long topics

* Update assets/javascripts/initializers/related-topics.js

Co-authored-by: Roman Rizzi <roman@discourse.org>

---------

Co-authored-by: Roman Rizzi <roman@discourse.org>

assets/javascripts/initializers/related-topics.js

@@ -0,0 +1,29 @@
+import { withPluginApi } from "discourse/lib/plugin-api";
+
+export default {
+  name: "discourse-ai-related-topics",
+
+  initialize(container) {
+    const settings = container.lookup("service:site-settings");
+
+    if (settings.ai_embeddings_semantic_related_topics_enabled) {
+      withPluginApi("1.1.0", (api) => {
+        api.modifyClass("model:post-stream", {
+          pluginId: "discourse-ai",
+
+          _setSuggestedTopics(result) {
+            this._super(...arguments);
+
+            if (!result.related_topics) {
+              return;
+            }
+
+            this.topic.setProperties({
+              related_topics: result.related_topics,
+            });
+          },
+        });
+      });
+    }
+  },
+};