fixes #1461

app/models/post.rb

@@ -3,13 +3,13 @@ class Post < ActiveRecord::Base
   class DisapprovalError < Exception ; end
   class SearchError < Exception ; end
 
-  attr_accessor :old_tag_string, :old_parent_id, :has_constraints, :disable_versioning
+  attr_accessor :old_tag_string, :old_parent_id, :old_source, :old_rating, :has_constraints, :disable_versioning
   after_destroy :delete_files
   after_destroy :delete_remote_files
   after_save :create_version
   after_save :update_parent_on_save
   after_save :apply_post_metatags, :on => :create
-  before_save :merge_old_tags
+  before_save :merge_old_changes
   before_save :normalize_tags
   before_save :create_tags
   before_save :update_tag_post_counts
@@ -34,7 +34,7 @@ class Post < ActiveRecord::Base
   has_many :favorites
   validates_uniqueness_of :md5
   validate :post_is_not_its_own_parent
-  attr_accessible :source, :rating, :tag_string, :old_tag_string, :last_noted_at, :parent_id, :as => [:member, :builder, :gold, :platinum, :contributor, :janitor, :moderator, :admin, :default]
+  attr_accessible :source, :rating, :tag_string, :old_tag_string, :old_parent_id, :old_source, :old_rating, :last_noted_at, :parent_id, :as => [:member, :builder, :gold, :platinum, :contributor, :janitor, :moderator, :admin, :default]
   attr_accessible :is_rating_locked, :is_note_locked, :as => [:builder, :contributor, :janitor, :moderator, :admin]
   attr_accessible :is_status_locked, :as => [:admin]
 
@@ -364,7 +364,7 @@ class Post < ActiveRecord::Base
       end
     end
 
-    def merge_old_tags
+    def merge_old_changes
       if old_tag_string
         # If someone else committed changes to this post before we did,
         # then try to merge the tag changes together.
@@ -373,6 +373,23 @@ class Post < ActiveRecord::Base
         old_tags = Tag.scan_tags(old_tag_string)
         set_tag_string(((current_tags + new_tags) - old_tags + (current_tags & new_tags)).uniq.sort.join(" "))
       end
+
+      if old_parent_id == ""
+        old_parent_id = nil
+      else
+        old_parent_id = old_parent_id.to_i
+      end
+      if old_parent_id == parent_id
+        self.parent_id = parent_id_was
+      end
+
+      if old_source == source.to_s
+        self.source = source_was
+      end
+
+      if old_rating == rating
+        self.rating = rating_was
+      end
     end
 
     def reset_tag_array_cache

app/views/posts/partials/show/_edit.html.erb

@@ -8,6 +8,9 @@
   <%= hidden_field_tag :tags_query, params[:tags] %>
   <%= hidden_field_tag :pool_id, params[:pool_id] %>
   <%= f.hidden_field :old_tag_string, :value => post.tag_string %>
+  <%= f.hidden_field :old_parent_id, :value => post.parent_id %>
+  <%= f.hidden_field :old_source, :value => post.source %>
+  <%= f.hidden_field :old_rating, :value => post.rating %>
 
   <div class="input">
     <% if post.is_rating_locked? %>