fix post set bug, fixes #768

app/controllers/posts_controller.rb

@@ -39,7 +39,7 @@ class PostsController < ApplicationController
           @error_message = @post.errors.full_messages.join("; ")
           render :template => "static/error", :status => 500
         else
-          redirect_to post_path(@post)
+          redirect_to post_path(@post, :tags => params[:tags])
         end
       end
       

app/logical/post_sets/post.rb

@@ -47,7 +47,7 @@ module PostSets
       end
       
       @posts ||= begin
-        ::Post.tag_match(tag_string).paginate(page, :count => ::Post.fast_count(tag_string), :limit => per_page)
+        temp = ::Post.tag_match(tag_string).paginate(page, :count => ::Post.fast_count(tag_string), :limit => per_page)
         temp.all
         temp
       end

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

@@ -5,6 +5,7 @@
 <% end %>
 
 <%= form_for(post, :html => {:class => "simple_form", :id => "form"}) do |f| %>
+  <%= hidden_field_tag :tags, params[:tags] %>
   <%= f.hidden_field :old_tag_string, :value => post.tag_string %>
 
   <div class="input">