Merged custom fields format refactoring.

git-svn-id: http://svn.redmine.org/redmine/trunk@12400 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/plugins/acts_as_customizable/lib/acts_as_customizable.rb

@@ -99,6 +99,7 @@ module Redmine
               cv ||= custom_values.build(:customized => self, :custom_field => field, :value => nil)
               x.value = cv.value
             end
+            x.value_was = x.value.dup if x.value
             x
           end
         end