Truncate and show a link to the full journal diff in the issue history

vendor/plugins/acts_as_journalized/lib/journal_formatter.rb

@@ -28,6 +28,7 @@ module JournalFormatter
   include CustomFieldsHelper
   include ActionView::Helpers::TagHelper
   include ActionView::Helpers::UrlHelper
+  include ActionView::Helpers::TextHelper
   include ActionController::UrlWriter
   extend Redmine::I18n
 
@@ -122,6 +123,16 @@ module JournalFormatter
     [label, old_value, value]
   end
 
+  # Formats a detail to be used with a Journal diff
+  #
+  # Truncates the content. Adds a link to view a diff.
+  def format_html_diff_detail(key, label, old_value, value)
+    link = link_to(l(:label_more), {:controller => 'journals', :action => 'diff', :id => id, :field => key.to_s})
+    old_value = truncate(old_value, :length => 80)
+    value = truncate(value, :length => 80) + " " + link
+    [old_value, value]
+  end
+  
   def property(detail)
     key = prop_key(detail)
     if key.start_with? "custom_values"
@@ -186,6 +197,9 @@ module JournalFormatter
     unless no_html
       label, old_value, value = *format_html_detail(label, old_value, value)
       value = format_html_attachment_detail(key.sub("attachments", ""), value) if attachment_detail
+      if property(detail) == :attribute && key == "description"
+        old_value, value = *format_html_diff_detail(key, label, old_value, value)
+      end
     end
 
     unless value.blank?