post_form.es6 in thredded-0.9.4

- old
+ new

@@ -1,5 +1,7 @@
+//= require ./preview_area
+
 (($) => {
   const COMPONENT_SELECTOR = '[data-thredded-post-form]';
 
   class ThreddedPostForm {
     constructor() {
@@ -7,9 +9,12 @@
     }
 
     init($nodes) {
       let $textarea = $nodes.find(this.textareaSelector);
       this.autosize($textarea);
+      $nodes.each(function() {
+        new ThreddedPreviewArea($(this));
+      });
       new ThreddedMentionAutocompletion($).init($nodes);
     }
 
     autosize($textarea) {
       $textarea.autosize()