fix for #1372, prefixed/suffixed underscores are rendered as underscores for users

app/models/user.rb

@@ -92,12 +92,12 @@ class User < ActiveRecord::Base
       end
 
       def id_to_pretty_name(user_id)
-        id_to_name(user_id).tr("_", " ")
+        id_to_name(user_id).gsub(/([^_])_+(?=[^_])/, "\\1 \\2")
       end
     end
 
     def pretty_name
-      name.tr("_", " ")
+      name.gsub(/([^_])_+(?=[^_])/, "\\1 \\2")
     end
 
     def update_cache

script/fixes/013.rb

@@ -13,3 +13,7 @@ Comment.find_each do |comment|
     comment.destroy
   end
 end
+
+User.where("name like ? or name like ?", "\\_%", "%\\_").each do |user|
+  puts "#{user.id}\t#{user.name}\t#{user.level}\t#{user.email}\t#{user.last_logged_in_at}"
+end ; true