Publish stories about objects in projects as related to projects

Summary:
Fixes T5456. We lost this logic in the transition to applicationtransactions.

When publishing a feed story, mark all of the object's projects as related, so the project filter in feed works.

Test Plan: Made a comment on a task associated with a project, saw the story in filtered feed.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: timor, epriestley

Maniphest Tasks: T5456

Differential Revision: https://secure.phabricator.com/D10233

src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php

@@ -2096,10 +2096,21 @@ abstract class PhabricatorApplicationTransactionEditor
     PhabricatorLiskDAO $object,
     array $xactions) {
 
-    return array(
+    $phids = array(
       $object->getPHID(),
       $this->getActingAsPHID(),
     );
+
+    if ($object instanceof PhabricatorProjectInterface) {
+      $project_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
+        $object->getPHID(),
+        PhabricatorProjectObjectHasProjectEdgeType::EDGECONST);
+      foreach ($project_phids as $project_phid) {
+        $phids[] = $project_phid;
+      }
+    }
+
+    return $phids;
   }