Add fix for EE merge message

app/models/project_services/chat_message/merge_message.rb

@@ -48,7 +48,7 @@ module ChatMessage
     end
 
     def merge_request_message
-      "#{user_combined_name} #{state} #{merge_request_link} in #{project_link}"
+      "#{user_combined_name} #{state_or_action_text} #{merge_request_link} in #{project_link}"
     end
 
     def merge_request_link
@@ -62,5 +62,10 @@ module ChatMessage
     def merge_request_url
       "#{project_url}/merge_requests/#{merge_request_iid}"
     end
+
+    # overridden in EE
+    def state_or_action_text
+      state
+    end
   end
 end

changelogs/unreleased/44596-double-title-merge-request-message.yml

 ---
 title: Fix double title in merge request chat messages.
-merge_request:
+merge_request: 21670
 author: Kukovskii Vladimir
 type: fixed