[IMP] Simplify darken, if snippets are clean, not need to change DOM

bzr revid: fp@openerp.com-20130915112642-bl9ku5rgkkwtovjr

addons/website/static/src/js/website.snippets.js

@@ -841,14 +841,6 @@
     website.snippet.editorRegistry.darken = website.snippet.Editor.extend({
         build_snippet: function($target) {
             $target.toggleClass('dark');
-            var $parent = $target.parent();
-            if($parent.hasClass('dark')){
-                $parent.replaceWith($target);
-            }else{
-                $parent = $("<div class='dark'></div>");
-                $target.after($parent);
-                $parent.append($target);
-            }
             this._super();
         }
     });

addons/website/static/src/xml/website.snippets.xml

@@ -101,7 +101,7 @@
         </div>
     </div>
 
-    <div t-name="website.snippets.darken" data-snippet-id='darken' data-category='style' data-action='mutate' data-selector='.container'>
+    <div t-name="website.snippets.darken" data-snippet-id='darken' data-category='style' data-action='mutate' data-selector='section'>
         <div class='oe_snippet_thumbnail oe_label'>Darken</div>
     </div>