route: split issue preview route to adding and editing

"No route matches" error raises in "preview_issue_path"
at app/views/issues/new.html.erb:35 on Rails 3.0.11 and Rails 3.1.3 new route format.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@8886 e93f8b46-1217-0410-a6f0-8f06a7374b81

config/routes.rb

@@ -44,8 +44,10 @@ ActionController::Routing::Routes.draw do |map|
   map.auto_complete_issues '/issues/auto_complete', :controller => 'auto_completes',
                            :action => 'issues', :conditions => { :method => :get }
   # TODO: would look nicer as /issues/:id/preview
-  map.preview_issue '/issues/preview/:id', :controller => 'previews',
-                    :action => 'issue'
+  map.preview_new_issue '/issues/preview/new/:project_id', :controller => 'previews',
+                        :action => 'issue'
+  map.preview_edit_issue '/issues/preview/edit/:id', :controller => 'previews',
+                         :action => 'issue'
   map.issues_context_menu '/issues/context_menu',
                           :controller => 'context_menus', :action => 'issues'