DEV: Add data-topic-id to more elements containing titles.

app/assets/javascripts/discourse/widgets/header-topic-info.js.es6

@@ -40,6 +40,7 @@ export default createWidget("header-topic-info", {
           className: "topic-link",
           action: "jumpToTopPost",
           href,
+          attributes: { "data-topic-id": topic.get("id") },
           contents: () => titleHTML
         })
       );

app/assets/javascripts/discourse/widgets/link.js.es6

@@ -35,12 +35,18 @@ export default createWidget("link", {
   },
 
   buildAttributes(attrs) {
-    return {
+    const ret = {
       href: this.href(attrs),
       title: attrs.title
         ? I18n.t(attrs.title, attrs.titleOptions)
         : this.label(attrs)
     };
+    if (attrs.attributes) {
+      Object.keys(attrs.attributes).forEach(
+        k => (ret[k] = attrs.attributes[k])
+      );
+    }
+    return ret;
   },
 
   label(attrs) {

app/assets/javascripts/discourse/widgets/post.js.es6

@@ -464,7 +464,11 @@ createWidget("post-article", {
   },
 
   buildAttributes(attrs) {
-    return { "data-post-id": attrs.id, "data-user-id": attrs.user_id };
+    return {
+      "data-post-id": attrs.id,
+      "data-topic-id": attrs.topicId,
+      "data-user-id": attrs.user_id
+    };
   },
 
   html(attrs, state) {