No sort Hash options in #grouped_options_for_select

actionpack/CHANGELOG.md

 ## Rails 4.0.0 (unreleased) ##
 
+*   No sort Hash options in #grouped_options_for_select. *Sergey Kojin*
+
 *   Accept symbols as #send_data :disposition value *Elia Schito*
 
 *   Add i18n scope to distance_of_time_in_words. *Steve Klabnik*

actionpack/lib/action_view/helpers/form_options_helper.rb

@@ -482,15 +482,15 @@ def option_groups_from_collection_for_select(collection, group_method, group_lab
       #   grouped_options_for_select(grouped_options)
       #
       # Possible output:
+      #   <optgroup label="North America">
+      #     <option value="US">United States</option>
+      #     <option value="Canada">Canada</option>
+      #   </optgroup>
       #   <optgroup label="Europe">
       #     <option value="Denmark">Denmark</option>
       #     <option value="Germany">Germany</option>
       #     <option value="France">France</option>
       #   </optgroup>
-      #   <optgroup label="North America">
-      #     <option value="US">United States</option>
-      #     <option value="Canada">Canada</option>
-      #   </optgroup>
       #
       # Sample usage (divider):
       #   grouped_options = [
@@ -530,8 +530,6 @@ def grouped_options_for_select(grouped_options, selected_key = nil, options = {}
           body.safe_concat content_tag(:option, prompt_text(prompt), :value => "")
         end
 
-        grouped_options = grouped_options.sort if grouped_options.is_a?(Hash)
-
         grouped_options.each do |container|
           if divider
             label = divider

actionpack/test/template/form_options_helper_test.rb

@@ -346,7 +346,7 @@ def test_grouped_options_for_select_with_prompt_returns_html_escaped_string
 
   def test_optgroups_with_with_options_with_hash
     assert_dom_equal(
-       "<optgroup label=\"Europe\"><option value=\"Denmark\">Denmark</option>\n<option value=\"Germany\">Germany</option></optgroup><optgroup label=\"North America\"><option value=\"United States\">United States</option>\n<option value=\"Canada\">Canada</option></optgroup>",
+       "<optgroup label=\"North America\"><option value=\"United States\">United States</option>\n<option value=\"Canada\">Canada</option></optgroup><optgroup label=\"Europe\"><option value=\"Denmark\">Denmark</option>\n<option value=\"Germany\">Germany</option></optgroup>",
        grouped_options_for_select({'North America' => ['United States','Canada'], 'Europe' => ['Denmark','Germany']})
     )
   end