Custom query columns: checkboxes replaced by two selects that let the user specify columns order.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@784 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/query.rb

@@ -211,7 +211,8 @@ class Query < ActiveRecord::Base
     if has_default_columns?
       available_columns.select {|c| c.default? }
     else
-      available_columns.select {|c| column_names.include?(c.name) }
+      # preserve the column_names order
+      column_names.collect {|name| available_columns.find {|col| col.name == name}}.compact
     end
   end