FIX: Do not display chat replies as threads in transcripts

plugins/chat/lib/chat/transcript_service.rb

@@ -167,6 +167,8 @@ def generate_markdown
       rendered_markdown = []
       rendered_thread_markdown = []
       all_messages_same_user = messages.count(:user_id) == 1
+      threading_enabled = @channel.threading_enabled?
+      thread_id = threading_enabled ? messages.first.thread_id : nil
 
       open_bbcode_tag =
         TranscriptBBCode.new(
@@ -175,27 +177,27 @@ def generate_markdown
           multiquote: messages.length > 1,
           chained: !all_messages_same_user,
           no_link: @opts[:no_link],
-          thread_id: messages.first.thread_id,
+          thread_id: thread_id,
           thread_ranges: @thread_ranges,
           include_reactions: @opts[:include_reactions],
         )
 
-      group_messages(messages).each do |id, message_group|
-        message = message_group.first
+      (threading_enabled ? group_messages(messages) : messages).each do |message_data|
+        message = threading_enabled ? message_data.first : message_data
 
-        if previous_message.present? &&
-             (
-               previous_message.user_id != message.user_id ||
-                 previous_message.thread_id != message.thread_id
-             )
+        user_changed = previous_message&.user_id != message.user_id
+        thread_changed = threading_enabled && previous_message&.thread_id != message.thread_id
+
+        if previous_message.present? && (user_changed || thread_changed)
           rendered_markdown << open_bbcode_tag.render
+          thread_id = threading_enabled ? message.thread_id : nil
 
           open_bbcode_tag =
             TranscriptBBCode.new(
               acting_user: @acting_user,
               chained: !all_messages_same_user,
               no_link: @opts[:no_link],
-              thread_id: message.thread_id,
+              thread_id: thread_id,
               thread_ranges: @thread_ranges,
               include_reactions: @opts[:include_reactions],
             )
@@ -208,8 +210,9 @@ def generate_markdown
         end
 
         previous_message = message
+        next if !threading_enabled
 
-        if message_group.length > 1
+        if message_data.length > 1
           previous_thread_message = nil
           rendered_thread_markdown.clear
 
@@ -221,7 +224,7 @@ def generate_markdown
               include_reactions: @opts[:include_reactions],
             )
 
-          message_group[1..].each do |thread_message|
+          message_data[1..].each do |thread_message|
             if previous_thread_message.present? &&
                  previous_thread_message.user_id != thread_message.user_id
               rendered_thread_markdown << thread_bbcode_tag.render
@@ -247,7 +250,7 @@ def generate_markdown
           end
           rendered_thread_markdown << thread_bbcode_tag.render
         end
-        thread_id = message_group.first.thread_id
+        thread_id = message_data.first.thread_id
         if thread_id.present?
           thread = Chat::Thread.find(thread_id)
           if thread&.replies_count > 0
@@ -267,7 +270,7 @@ def generate_markdown
     private
 
     def group_messages(messages)
-      messages.group_by { |msg| msg.thread_id || msg.id }
+      messages.group_by { |msg| msg.thread_id || msg.id }.values
     end
 
     def messages

plugins/chat/spec/lib/chat/channel_archive_service_spec.rb

@@ -152,6 +152,8 @@ def start_archive
       end
 
       xit "creates the correct posts for a channel with messages and threads" do
+        channel.update!(threading_enabled: true)
+
         create_messages(2)
         create_threaded_messages(6, title: "a new thread")
         create_messages(7)

plugins/chat/spec/lib/chat/transcript_service_spec.rb

@@ -154,6 +154,37 @@ def service(message_ids, opts: {})
     MARKDOWN
   end
 
+  xit "generates the correct markdown for messages that are in reply to other messages" do
+    channel.update!(threading_enabled: false)
+    thread = Fabricate(:chat_thread, channel: channel)
+
+    message1 =
+      Fabricate(
+        :chat_message,
+        user: user1,
+        chat_channel: channel,
+        thread: thread,
+        message: "an extremely insightful response :)",
+      )
+    message2 = Fabricate(:chat_message, user: user2, chat_channel: channel, message: "says you!")
+    message3 =
+      Fabricate(:chat_message, user: user1, chat_channel: channel, thread: thread, message: "aw :(")
+
+    expect(service([message1.id, message2.id, message3.id]).generate_markdown).to eq(<<~MARKDOWN)
+    [chat quote="martinchat;#{message1.id};#{message1.created_at.iso8601}" channel="The Beam Discussions" channelId="#{channel.id}" multiQuote="true" chained="true"]
+    an extremely insightful response :)
+    [/chat]
+
+    [chat quote="brucechat;#{message2.id};#{message2.created_at.iso8601}" chained="true"]
+    says you!
+    [/chat]
+
+    [chat quote="martinchat;#{message3.id};#{message3.created_at.iso8601}" chained="true"]
+    aw :(
+    [/chat]
+    MARKDOWN
+  end
+
   it "generates the correct markdown if a message has text and an upload" do
     SiteSetting.authorized_extensions = "mp4|mp3|pdf|jpg"
     message =