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

app/views/issues/_edit.html.erb

@@ -39,7 +39,7 @@
     <%= hidden_field_tag 'last_journal_id', params[:last_journal_id] || @issue.last_journal_id %>
     <%= submit_tag l(:button_submit) %>
     <%= link_to_remote l(:label_preview),
-                       { :url => preview_issue_path(:project_id => @project, :id => @issue),
+                       { :url => preview_edit_issue_path(:project_id => @project, :id => @issue),
                          :method => 'post',
                          :update => 'preview',
                          :with => 'Form.serialize("issue-form")',

app/views/issues/new.html.erb

@@ -32,7 +32,7 @@
     <%= submit_tag l(:button_create) %>
     <%= submit_tag l(:button_create_and_continue), :name => 'continue' %>
     <%= link_to_remote l(:label_preview),
-                       { :url => preview_issue_path(:project_id => @project),
+                       { :url => preview_new_issue_path(:project_id => @project),
                          :method => 'post',
                          :update => 'preview',
                          :with => "Form.serialize('issue-form')",