UX: remove excerpt + style change to thread list item (#23776)

UX changes to thread item:

- drop "last reply" timestamp copy
- drop last reply excerpt
- show up 9+OP members

Co-authored-by: David Battersby <info@davidbattersby.com>

plugins/chat/app/queries/chat/thread_participant_query.rb

@@ -2,12 +2,15 @@
 
 module Chat
   # Builds a query to find the total count of participants for one
-  # or more threads (on a per-thread basis), as well as up to 3
+  # or more threads (on a per-thread basis), as well as up to 10
   # participants in the thread. The participants will be made up
   # of:
   #
-  # - Participant 1 & 2 - The most frequent participants in the thread.
-  # - Participant 3 - The most recent participant in the thread.
+  # The most frequent participants in the thread:
+  # - Participant 1-2 (preview)
+  # - Participant 1-9 (thread list)
+  # The most recent participant in the thread.
+  # - Participant 10
   #
   # This result should be cached to avoid unnecessary queries,
   # since the participants will not often change for a thread,
@@ -15,8 +18,9 @@ module Chat
   # count it is not a big deal.
   class ThreadParticipantQuery
     # @param thread_ids [Array<Integer>] The IDs of the threads to query.
+    # @param preview [Boolean] Determines the number of participants to return.
     # @return [Hash<Integer, Hash>] A hash of thread IDs to participant data.
-    def self.call(thread_ids:)
+    def self.call(thread_ids:, preview: true)
       return {} if thread_ids.blank?
 
       # We only want enough data for BasicUserSerializer, since the participants
@@ -60,6 +64,8 @@ module Chat
           hash
         end
 
+      total_participants = preview ? 2 : 9
+
       thread_participants = {}
       thread_participant_stats.each do |thread_participant_stat|
         thread_id = thread_participant_stat.thread_id
@@ -69,7 +75,7 @@ module Chat
 
         # If we want to return more of the top N users in the thread we
         # can just increase the number here.
-        if thread_participants[thread_id][:users].length < 2 &&
+        if thread_participants[thread_id][:users].length < total_participants &&
              thread_participant_stat.user_id != most_recent_participants[thread_id][:id]
           thread_participants[thread_id][:users].push(
             {

plugins/chat/app/services/chat/lookup_channel_threads.rb

@@ -135,7 +135,8 @@ module Chat
     end
 
     def fetch_participants(threads:, **)
-      context.participants = ::Chat::ThreadParticipantQuery.call(thread_ids: threads.map(&:id))
+      context.participants =
+        ::Chat::ThreadParticipantQuery.call(thread_ids: threads.map(&:id), preview: false)
     end
 
     def build_load_more_url(contract:, **)

plugins/chat/assets/javascripts/discourse/components/chat/thread-list/item.hbs

@@ -26,33 +26,26 @@
         </div>
       </div>
 
-      <div class="chat-thread-list-item__body">
-        <span class="chat-thread-list-item__last-reply-author">
-          @{{@thread.preview.lastReplyUser.username}}:
-        </span>
-        <span class="chat-thread-list-item__last-reply-excerpt">
-          {{replace-emoji (html-safe @thread.preview.lastReplyExcerpt)}}
-        </span>
-      </div>
-
       <div class="chat-thread-list-item__metadata">
 
+        <div class="chat-thread-list-item__members">
+          <Chat::UserAvatar
+            @user={{@thread.originalMessage.user}}
+            @showPresence={{false}}
+          />
+          <Chat::Thread::Participants
+            @thread={{@thread}}
+            @includeOriginalMessageUser={{false}}
+            class="chat-thread-list-item__participants"
+          />
+        </div>
+
         <div class="chat-thread-list-item__last-reply-timestamp">
           {{#if @thread.preview.lastReplyCreatedAt}}
-            <span>{{i18n "chat.thread.last_reply"}}</span>
             {{format-date @thread.preview.lastReplyCreatedAt leaveAgo="true"}}
           {{/if}}
         </div>
 
-        <Chat::UserAvatar
-          @user={{@thread.originalMessage.user}}
-          @showPresence={{false}}
-        />
-        <Chat::Thread::Participants
-          @thread={{@thread}}
-          @includeOriginalMessageUser={{false}}
-          class="chat-thread-list-item__participants"
-        />
       </div>
     </div>
   </div>

plugins/chat/assets/stylesheets/common/chat-thread-list-item.scss

@@ -19,7 +19,6 @@
   .touch & {
     &:active {
       background-color: var(--d-hover);
-      border: 1px solid var(--primary-300);
     }
   }
 
@@ -27,13 +26,21 @@
     &:hover,
     &:active {
       background-color: var(--d-hover);
-      border: 1px solid var(--primary-300);
     }
   }
 
-  &__participants {
+  &__members {
     display: flex;
     align-items: center;
+    overflow: hidden;
+  }
+
+  &__participants {
+    position: relative;
+    display: flex;
+    align-items: center;
+    overflow: hidden;
+    margin-right: 0.25rem;
   }
 
   &__main {
@@ -63,47 +70,50 @@
   &__metadata {
     display: flex;
     align-items: center;
-    justify-content: flex-end;
-
+    gap: 0.5rem;
     .chat-user-avatar {
+      &__container {
+        padding: 0;
+      }
       .avatar {
-        border: 1px solid var(--primary-very-low);
+        border: 2px solid var(--primary-very-low);
+        padding: 0;
+
+        .chat-thread-list-item:hover & {
+          border-color: var(--d-hover);
+        }
       }
 
       &:not(:last-child) {
-        margin-right: -8px;
+        margin-right: -6px;
       }
     }
+    .chat-thread-participants__avatar-group {
+      overflow: hidden;
+      justify-content: flex-start;
+    }
   }
 
-  &__participants {
-    margin-right: 0.25rem;
-  }
-
   &__last-reply-timestamp {
+    flex-shrink: 0;
     color: var(--primary-medium);
     font-size: var(--font-down-2);
     @include ellipsis;
-    margin-right: auto;
+    margin-left: auto;
   }
 
   &__header {
     display: flex;
     flex-direction: row;
     align-items: center;
-    margin-bottom: 0.25rem;
+    margin-bottom: 0.5rem;
   }
 
   &__title {
     flex: 1 1 auto;
-    font-weight: bold;
     @include ellipsis;
   }
 
-  &__last-reply-excerpt {
-    font-size: var(--font-down-1);
-  }
-
   &__unread-indicator {
     flex: 0 0 auto;
 

plugins/chat/spec/queries/chat/thread_participant_query_spec.rb

@@ -3,6 +3,7 @@
 RSpec.describe Chat::ThreadParticipantQuery do
   fab!(:thread_1) { Fabricate(:chat_thread) }
   fab!(:thread_2) { Fabricate(:chat_thread) }
+  fab!(:thread_3) { Fabricate(:chat_thread) }
 
   context "when users have messaged in the thread" do
     fab!(:user_1) { Fabricate(:user) }
@@ -34,10 +35,8 @@ RSpec.describe Chat::ThreadParticipantQuery do
       )
     end
 
-    it "does not return more than 3 thread participants" do
-      other_user = Fabricate(:user)
-      thread_1.add(other_user)
-      Fabricate(:chat_message, thread: thread_1, user: other_user)
+    it "does not return more than 3 thread participants by default" do
+      thread_1.add(Fabricate(:user))
       result = described_class.call(thread_ids: [thread_1.id])
       expect(result[thread_1.id][:users].length).to eq(3)
     end
@@ -105,4 +104,27 @@ RSpec.describe Chat::ThreadParticipantQuery do
       expect(result[thread_2.id][:total_count]).to eq(1)
     end
   end
+
+  context "when using preview false" do
+    1..9.times do |i|
+      user = "user_#{i}".to_sym
+      fab!(user) { Fabricate(:user) }
+    end
+
+    before do
+      1..9.times do |i|
+        user = "user_#{i}".to_sym
+        thread_3.add(public_send(user))
+        Fabricate(:chat_message, thread: thread_3, user: public_send(user))
+      end
+    end
+
+    it "does not return more than 10 thread participants when preview is false" do
+      other_user = Fabricate(:user)
+      thread_3.add(other_user)
+      Fabricate(:chat_message, thread: thread_3, user: other_user)
+      result = described_class.call(thread_ids: [thread_3.id], preview: false)
+      expect(result[thread_3.id][:users].length).to eq(10)
+    end
+  end
 end