Phriction - fix edits with subscribers

Summary: pre-patch, these fatal, since we overwrite $content to be just a string so methods fail later in the code. Instead, write a $content_str to keep $content as the proper data.

Test Plan: editing a document and on save it showed me the view page! (as opposed to fataling and staying on the eidt page)

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D10426

src/applications/phriction/editor/PhrictionDocumentEditor.php

@@ -264,7 +264,7 @@ final class PhrictionDocumentEditor extends PhabricatorEditor {
     }
 
     if ($feed_action) {
-      $content = id(new PhutilUTF8StringTruncator())
+      $content_str = id(new PhutilUTF8StringTruncator())
         ->setMaximumGlyphs(140)
         ->truncateString($new_content->getContent());
       id(new PhabricatorFeedStoryPublisher())
@@ -276,7 +276,7 @@ final class PhrictionDocumentEditor extends PhabricatorEditor {
           array(
             'phid'      => $document->getPHID(),
             'action'    => $feed_action,
-            'content'   => $content,
+            'content'   => $content_str,
             'project'   => $project_phid,
             'movedFromPHID' => $this->fromDocumentPHID,
           ))