rename _snowman to _e

actionpack/lib/action_view/helpers/form_tag_helper.rb

@@ -538,7 +538,7 @@ def html_options_for_form(url_for_options, options, *parameters_for_url)
 
         def extra_tags_for_form(html_options)
           snowman_tag = tag(:input, :type => "hidden",
-                            :name => "_snowman", :value => "☃".html_safe)
+                            :name => "_e", :value => "☃".html_safe)
 
           method = html_options.delete("method").to_s
 

actionpack/test/template/form_helper_test.rb

@@ -1513,7 +1513,7 @@ def test_form_for_with_labelled_builder
 
   def snowman(method = nil)
     txt =  %{<div style="margin:0;padding:0;display:inline">}
-    txt << %{<input name="_snowman" type="hidden" value="&#9731;" />}
+    txt << %{<input name="_e" type="hidden" value="&#9731;" />}
     txt << %{<input name="_method" type="hidden" value="#{method}" />} if method
     txt << %{</div>}
   end

actionpack/test/template/form_tag_helper_test.rb

@@ -12,7 +12,7 @@ def snowman(options = {})
     method = options[:method]
 
     txt =  %{<div style="margin:0;padding:0;display:inline">}
-    txt << %{<input name="_snowman" type="hidden" value="&#9731;" />}
+    txt << %{<input name="_e" type="hidden" value="&#9731;" />}
     txt << %{<input name="_method" type="hidden" value="#{method}" />} if method
     txt << %{</div>}
   end