Folding labeled box positioning into rendering

src/js/parser/javascript/charset.js

@@ -6,11 +6,7 @@ export default _.extend({}, Base, {
   type: 'charset',
 
   _render() {
-    var partContainer;
-
-    this.renderLabeledBox(this.invert() ? 'None of:' : 'One of:');
-
-    partContainer = this.container.group();
+    var partContainer = this.container.group();
 
     return Q.all(_.map(this.parts.elements, part => {
       return part.render(partContainer.group());
@@ -20,7 +16,7 @@ export default _.extend({}, Base, {
           padding: 5
         });
 
-        this.positionLabeledBox(partContainer, {
+        return this.renderLabeledBox(this.invert() ? 'None of:' : 'One of:', partContainer, {
           padding: 5
         });
       }).bind(this));