DEV: Include unread topics in New topic lists and link to it in sidebar (#20432)

This commit introduces a few experimental changes to the New topics list and "Everything" link in the sidebar:

1. Make the New topics list include unread topics
2. Make the Everything section in the sidebar link to the New topics list (`/new`)
3. Remove "unread" or "new" text next to the count and keep the count
4. The count is a sum of new and unread topics counts

All of these of changes are behind an off-by-default feature flag. I've not written extensive tests for these changes because they're highly experimental.

Internal topic: t/77234.

app/assets/javascripts/discourse/app/controllers/discovery/topics.js

@@ -150,7 +150,6 @@ const controllerOpts = {
   hasTopics: gt("model.topics.length", 0),
   allLoaded: empty("model.more_topics_url"),
   latest: endWith("model.filter", "latest"),
-  new: endWith("model.filter", "new"),
   top: endWith("model.filter", "top"),
   yearly: equal("period", "yearly"),
   quarterly: equal("period", "quarterly"),
@@ -158,6 +157,11 @@ const controllerOpts = {
   weekly: equal("period", "weekly"),
   daily: equal("period", "daily"),
 
+  @discourseComputed("model.filter")
+  new(filter) {
+    return filter?.endsWith("new") && !this.currentUser?.new_new_view_enabled;
+  },
+
   @discourseComputed("allLoaded", "model.topics.length")
   footerMessage(allLoaded, topicsLength) {
     if (!allLoaded) {

app/assets/javascripts/discourse/app/lib/sidebar/common/community-section/everything-section-link.js

@@ -9,6 +9,7 @@ export default class EverythingSectionLink extends BaseSectionLink {
   @tracked totalNew = 0;
   @tracked hideCount =
     this.currentUser?.sidebarListDestination !== UNREAD_LIST_DESTINATION;
+  linkToNew = !!this.currentUser?.new_new_view_enabled;
 
   constructor() {
     super(...arguments);
@@ -26,7 +27,7 @@ export default class EverythingSectionLink extends BaseSectionLink {
 
     this.totalUnread = this.topicTrackingState.countUnread();
 
-    if (this.totalUnread === 0) {
+    if (this.totalUnread === 0 || this.linkToNew) {
       this.totalNew = this.topicTrackingState.countNew();
     }
   }
@@ -48,10 +49,17 @@ export default class EverythingSectionLink extends BaseSectionLink {
   }
 
   get currentWhen() {
-    return "discovery.latest discovery.new discovery.unread discovery.top";
+    if (this.linkToNew) {
+      return "discovery.new";
+    } else {
+      return "discovery.latest discovery.new discovery.unread discovery.top";
+    }
   }
 
   get badgeText() {
+    if (this.linkToNew && this.#unreadAndNewCount > 0) {
+      return this.#unreadAndNewCount.toString();
+    }
     if (this.hideCount) {
       return;
     }
@@ -63,13 +71,15 @@ export default class EverythingSectionLink extends BaseSectionLink {
       return I18n.t("sidebar.new_count", {
         count: this.totalNew,
       });
-    } else {
-      return;
     }
   }
 
   get route() {
-    if (this.currentUser?.sidebarListDestination === UNREAD_LIST_DESTINATION) {
+    if (this.linkToNew) {
+      return "discovery.new";
+    } else if (
+      this.currentUser?.sidebarListDestination === UNREAD_LIST_DESTINATION
+    ) {
       if (this.totalUnread > 0) {
         return "discovery.unread";
       }
@@ -93,8 +103,16 @@ export default class EverythingSectionLink extends BaseSectionLink {
   }
 
   get suffixValue() {
-    if (this.hideCount && (this.totalUnread || this.totalNew)) {
+    if (
+      this.hideCount &&
+      (this.totalUnread || this.totalNew) &&
+      !this.linkToNew
+    ) {
       return "circle";
     }
   }
+
+  get #unreadAndNewCount() {
+    return this.totalUnread + this.totalNew;
+  }
 }

app/assets/javascripts/discourse/app/models/nav-item.js

@@ -249,6 +249,10 @@ NavItem.reopenClass({
     }
     let items = args.siteSettings.top_menu.split("|");
 
+    const user = getOwner(this).lookup("service:current-user");
+    if (user?.new_new_view_enabled) {
+      items = items.reject((item) => item === "unread");
+    }
     const filterType = (args.filterMode || "").split("/").pop();
 
     if (!items.some((i) => filterType === i)) {

app/assets/javascripts/discourse/app/models/topic-tracking-state.js

@@ -709,12 +709,21 @@ const TopicTrackingState = EmberObject.extend({
     let categoryId = category ? get(category, "id") : null;
 
     if (type === "new") {
-      return this.countNew({
+      let count = this.countNew({
         categoryId,
         tagId,
         noSubcategories,
         customFilterFn,
       });
+      if (this.currentUser?.new_new_view_enabled) {
+        count += this.countUnread({
+          categoryId,
+          tagId,
+          noSubcategories,
+          customFilterFn,
+        });
+      }
+      return count;
     } else if (type === "unread") {
       return this.countUnread({
         categoryId,
@@ -790,8 +799,14 @@ const TopicTrackingState = EmberObject.extend({
   // for a particular seen topic has not yet reached the server.
   _fixDelayedServerState(list, filter) {
     for (let index = list.topics.length - 1; index >= 0; index--) {
-      const state = this.findState(list.topics[index].id);
-      if (state && state.last_read_post_number > 0) {
+      const topic = list.topics[index];
+      const state = this.findState(topic.id);
+      if (
+        state &&
+        state.last_read_post_number > 0 &&
+        (topic.last_read_post_number === 0 ||
+          !this.currentUser?.new_new_view_enabled)
+      ) {
         if (filter === "new") {
           list.topics.splice(index, 1);
         } else {

app/models/user.rb

@@ -1812,6 +1812,10 @@ class User < ActiveRecord::Base
     !SiteSetting.legacy_navigation_menu? || SiteSetting.enable_new_notifications_menu
   end
 
+  def new_new_view_enabled?
+    in_any_groups?(SiteSetting.experimental_new_new_view_groups_map)
+  end
+
   protected
 
   def badge_grant

app/serializers/current_user_serializer.rb

@@ -69,7 +69,8 @@ class CurrentUserSerializer < BasicUserSerializer
              :sidebar_category_ids,
              :sidebar_list_destination,
              :sidebar_sections,
-             :custom_sidebar_sections_enabled
+             :custom_sidebar_sections_enabled,
+             :new_new_view_enabled?
 
   delegate :user_stat, to: :object, private: true
   delegate :any_posts, :draft_count, :pending_posts_count, :read_faq?, to: :user_stat

config/locales/server.en.yml

@@ -2398,6 +2398,7 @@ en:
     default_sidebar_tags: "Selected tags will be displayed under Sidebar's Tags section by default."
     enable_new_notifications_menu: "Enables the new notifications menu for the legacy navigation menu."
     enable_experimental_hashtag_autocomplete: "EXPERIMENTAL: Use the new #hashtag autocompletion system for categories and tags that renders the selected item differently and has improved search"
+    experimental_new_new_view_groups: "EXPERIMENTAL: Enable a new topics list that combines unread and new topics and make the \"Everything\" link in the sidebar link to it."
 
     errors:
       invalid_css_color: "Invalid color. Enter a color name or hex value."

config/site_settings.yml

@@ -2073,6 +2073,13 @@ developer:
     client: true
     default: false
     hidden: true
+  experimental_new_new_view_groups:
+    client: true
+    type: group_list
+    list_type: compact
+    default: ""
+    allow_any: false
+    refresh: true
 
 navigation:
   navigation_menu:

lib/topic_query.rb

@@ -267,7 +267,11 @@ class TopicQuery
   end
 
   def list_new
-    create_list(:new, { unordered: true }, new_results)
+    if @user&.new_new_view_enabled?
+      create_list(:new, { unordered: true }, new_and_unread_results)
+    else
+      create_list(:new, { unordered: true }, new_results)
+    end
   end
 
   def list_unread