Index: app/helpers/application_helper.rb
===================================================================
--- app/helpers/application_helper.rb	(revision 12823)
+++ app/helpers/application_helper.rb	(working copy)
@@ -324,11 +324,15 @@
   end
 
   # Returns a string for users/groups option tags
-  def principals_options_for_select(collection, selected=nil)
+  def principals_options_for_select(collection, selected=nil, previous=nil)
     s = ''
     if collection.include?(User.current)
       s << content_tag('option', "<< #{l(:label_me)} >>", :value => User.current.id)
     end
+    if previous!=nil && collection.include?(User.find_by_id(previous))
+       p = User.find_by_id(previous)
+       s << content_tag('option', "<< #{l(:label_previous)}: #{h p.name} >>", :value => p.id)
+    end
     groups = ''
     collection.sort.each do |element|
       selected_attribute = ' selected="selected"' if option_value_selected?(element, selected) || element.id.to_s == selected
Index: app/helpers/issues_helper.rb
===================================================================
--- app/helpers/issues_helper.rb	(revision 12823)
+++ app/helpers/issues_helper.rb	(working copy)
@@ -260,30 +260,32 @@
     strings = []
     values_by_field = {}
     details.each do |detail|
-      if detail.property == 'cf'
-        field = detail.custom_field
-        if field && field.multiple?
-          values_by_field[field] ||= {:added => [], :deleted => []}
-          if detail.old_value
-            values_by_field[field][:deleted] << detail.old_value
-          end
-          if detail.value
-            values_by_field[field][:added] << detail.value
-          end
-          next
-        end
+      unless detail.prop_key == "previous_assigned_to_id"
+	      if detail.property == 'cf'
+            field = detail.custom_field
+      		if field && field.multiple?
+               values_by_field[field] ||= {:added => [], :deleted => []}
+      		   if detail.old_value
+                  values_by_field[field][:deleted] << detail.old_value
+      		   end
+      		   if detail.value
+                  values_by_field[field][:added] << detail.value
+      		   end
+      		   next
+		      end
+	      end
+	      strings << show_detail(detail, no_html, options)
+       end
       end
-      strings << show_detail(detail, no_html, options)
-    end
     values_by_field.each do |field, changes|
       detail = JournalDetail.new(:property => 'cf', :prop_key => field.id.to_s)
       detail.instance_variable_set "@custom_field", field
-      if changes[:added].any?
-        detail.value = changes[:added]
-        strings << show_detail(detail, no_html, options)
-      elsif changes[:deleted].any?
-        detail.old_value = changes[:deleted]
-        strings << show_detail(detail, no_html, options)
+        if changes[:added].any?
+          detail.value = changes[:added]
+          strings << show_detail(detail, no_html, options)
+        elsif changes[:deleted].any?
+          detail.old_value = changes[:deleted]
+          strings << show_detail(detail, no_html, options)
       end
     end
     strings
Index: app/models/issue.rb
===================================================================
--- app/models/issue.rb	(revision 12823)
+++ app/models/issue.rb	(working copy)
@@ -93,7 +93,7 @@
 
   before_create :default_assign
   before_save :close_duplicates, :update_done_ratio_from_issue_status,
-              :force_updated_on_change, :update_closed_on, :set_assigned_to_was
+              :force_updated_on_change, :update_closed_on, :set_assigned_to_was, :update_previous_assignee
   after_save {|issue| issue.send :after_project_change if !issue.id_changed? && issue.project_id_changed?} 
   after_save :reschedule_following_issues, :update_nested_set_attributes,
              :update_parent_attributes, :create_journal
 
@@ -1459,6 +1459,15 @@
     end
   end
 
+
+  def update_previous_assignee
+    if assigned_to_id?
+      #self.previous_assigned_to = User.find_by_id(assigned_to_id_was)
+      self.previous_assigned_to_id = assigned_to_id_was
+    end
+  end
+
+
   # Saves the changes in a Journal
   # Called after_save
   def create_journal
Index: app/views/issues/_attributes.html.erb
===================================================================
--- app/views/issues/_attributes.html.erb	(revision 12823)
+++ app/views/issues/_attributes.html.erb	(working copy)
@@ -15,7 +15,7 @@
 <% end %>
 
 <% if @issue.safe_attribute? 'assigned_to_id' %>
-<p><%= f.select :assigned_to_id, principals_options_for_select(@issue.assignable_users, @issue.assigned_to), :include_blank => true, :required => @issue.required_attribute?('assigned_to_id') %></p>
+<p><%= f.select :assigned_to_id, principals_options_for_select(@issue.assignable_users, @issue.assigned_to, @issue.previous_assigned_to_id ), :include_blank => true, :required => @issue.required_attribute?('assigned_to_id') %></p>
 <% end %>
 
 <% if @issue.safe_attribute?('category_id') && @issue.project.issue_categories.any? %>