Restore implicit rendering for XHR requests that want a HTML template [#1590 state:resolved]

actionpack/lib/action_view/paths.rb

@@ -45,6 +45,9 @@ def find_template(original_template_path, format = nil)
           return template
         elsif template = load_path[template_path]
           return template
+        # Try to find html version if the format is javascript
+        elsif format == :js && template = load_path["#{template_path}.html"]
+          return template
         end
       end
 

actionpack/test/controller/render_test.rb

@@ -274,6 +274,9 @@ def render_implicit_html_template
   def render_explicit_html_template
   end
 
+  def render_implicit_html_template_from_xhr_request
+  end
+
   def formatted_html_erb
   end
 
@@ -1010,6 +1013,11 @@ def test_explicitly_rendering_an_html_template_with_implicit_html_template_rende
     end
   end
 
+  def test_should_implicitly_render_html_template_from_xhr_request
+    get :render_implicit_html_template_from_xhr_request, :format => :js
+    assert_equal "Hello HTML!", @response.body
+  end
+
   def test_should_render_formatted_template
     get :formatted_html_erb
     assert_equal 'formatted html erb', @response.body

actionpack/test/fixtures/test/render_implicit_html_template_from_xhr_request.html.erb

@@ -0,0 +1 @@
+Hello HTML!