Fix issue where TextHelper#simple_format was calling missing 'raw' method

actionview/lib/action_view/helpers/text_helper.rb

@@ -31,6 +31,8 @@ module TextHelper
 
       include SanitizeHelper
       include TagHelper
+      include OutputSafetyHelper
+
       # The preferred method of outputting text in your views is to use the
       # <%= "text" %> eRuby syntax. The regular _puts_ and _print_ methods
       # do not operate as expected in an eRuby code block. If you absolutely must

actionview/test/template/text_helper_test.rb

@@ -21,6 +21,11 @@ def test_simple_format_should_be_html_safe
     assert simple_format("<b> test with html tags </b>").html_safe?
   end
 
+  def test_simple_format_included_in_isolation
+    helper_klass = Class.new { include ActionView::Helpers::TextHelper }
+    assert helper_klass.new.simple_format("<b> test with html tags </b>").html_safe?
+  end
+
   def test_simple_format
     assert_equal "<p></p>", simple_format(nil)