FIX: if prioritizing names in ux choose name over username in email

app/helpers/user_notifications_helper.rb

@@ -58,7 +58,18 @@ module UserNotificationsHelper
     name.downcase.gsub(/[\s_-]/, '')
   end
 
+  def show_username_on_post(post)
+    return true if SiteSetting.prioritize_username_in_ux
+    return true unless SiteSetting.enable_names?
+    return true unless SiteSetting.display_name_on_posts?
+    return true unless post.user.name.present?
+
+    normalize_name(post.user.name) != normalize_name(post.user.username)
+  end
+
   def show_name_on_post(post)
+    return true unless SiteSetting.prioritize_username_in_ux
+
     SiteSetting.enable_names? &&
       SiteSetting.display_name_on_posts? &&
       post.user.name.present? &&

app/views/email/_post.html.erb

@@ -8,7 +8,9 @@
               <img src="<%= post.user.small_avatar_url %>" title="<%= post.user.username%>">
             </td>
             <td>
+              <%- if show_username_on_post(post) %>
               <a class="username" href="<%=Discourse.base_url%>/users/<%= post.user.username_lower%>" target="_blank"><%= post.user.username %></a>
+              <% end %>
               <%- if show_name_on_post(post) %>
                 <a class="user-name" href="<%=Discourse.base_url%>/users/<%= post.user.username_lower%>" target="_blank"><%= post.user.name %></a>
               <% end %>

spec/mailers/user_notifications_spec.rb

@@ -232,6 +232,39 @@ describe UserNotifications do
 
 
       expect(mail.html_part.to_s.scan(/In Reply To/).count).to eq(0)
+
+
+
+      SiteSetting.enable_names = true
+      SiteSetting.display_name_on_posts = true
+      SiteSetting.prioritize_username_in_ux = false
+
+      response.user.username = "bobmarley"
+      response.user.name = "Bob Marley"
+      response.user.save
+
+      mail = UserNotifications.user_replied(response.user,
+                                             post: response,
+                                             notification_type: notification.notification_type,
+                                             notification_data_hash: notification.data_hash
+                                           )
+
+
+      mail_html = mail.html_part.to_s
+      expect(mail_html.scan(/>Bob Marley/).count).to eq(1)
+      expect(mail_html.scan(/>bobmarley/).count).to eq(0)
+
+      SiteSetting.prioritize_username_in_ux = true
+
+      mail = UserNotifications.user_replied(response.user,
+                                             post: response,
+                                             notification_type: notification.notification_type,
+                                             notification_data_hash: notification.data_hash
+                                           )
+
+      mail_html = mail.html_part.to_s
+      expect(mail_html.scan(/>Bob Marley/).count).to eq(0)
+      expect(mail_html.scan(/>bobmarley/).count).to eq(1)
     end
   end