Clean up Slowvote transactions a little

Summary: Ref T12685. Moves to `xaction` folder and sets description changes in transaction stories.

Test Plan: Make a poll, edit the description.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12685

Differential Revision: https://secure.phabricator.com/D17849

src/__phutil_library_map__.php

@@ -3912,12 +3912,12 @@ phutil_register_library_map(array(
     'PhabricatorSlowvoteApplication' => 'applications/slowvote/application/PhabricatorSlowvoteApplication.php',
     'PhabricatorSlowvoteChoice' => 'applications/slowvote/storage/PhabricatorSlowvoteChoice.php',
     'PhabricatorSlowvoteCloseController' => 'applications/slowvote/controller/PhabricatorSlowvoteCloseController.php',
-    'PhabricatorSlowvoteCloseTransaction' => 'applications/slowvote/xactions/PhabricatorSlowvoteCloseTransaction.php',
+    'PhabricatorSlowvoteCloseTransaction' => 'applications/slowvote/xaction/PhabricatorSlowvoteCloseTransaction.php',
     'PhabricatorSlowvoteCommentController' => 'applications/slowvote/controller/PhabricatorSlowvoteCommentController.php',
     'PhabricatorSlowvoteController' => 'applications/slowvote/controller/PhabricatorSlowvoteController.php',
     'PhabricatorSlowvoteDAO' => 'applications/slowvote/storage/PhabricatorSlowvoteDAO.php',
     'PhabricatorSlowvoteDefaultViewCapability' => 'applications/slowvote/capability/PhabricatorSlowvoteDefaultViewCapability.php',
-    'PhabricatorSlowvoteDescriptionTransaction' => 'applications/slowvote/xactions/PhabricatorSlowvoteDescriptionTransaction.php',
+    'PhabricatorSlowvoteDescriptionTransaction' => 'applications/slowvote/xaction/PhabricatorSlowvoteDescriptionTransaction.php',
     'PhabricatorSlowvoteEditController' => 'applications/slowvote/controller/PhabricatorSlowvoteEditController.php',
     'PhabricatorSlowvoteEditor' => 'applications/slowvote/editor/PhabricatorSlowvoteEditor.php',
     'PhabricatorSlowvoteListController' => 'applications/slowvote/controller/PhabricatorSlowvoteListController.php',
@@ -3927,16 +3927,16 @@ phutil_register_library_map(array(
     'PhabricatorSlowvotePollController' => 'applications/slowvote/controller/PhabricatorSlowvotePollController.php',
     'PhabricatorSlowvotePollPHIDType' => 'applications/slowvote/phid/PhabricatorSlowvotePollPHIDType.php',
     'PhabricatorSlowvoteQuery' => 'applications/slowvote/query/PhabricatorSlowvoteQuery.php',
-    'PhabricatorSlowvoteQuestionTransaction' => 'applications/slowvote/xactions/PhabricatorSlowvoteQuestionTransaction.php',
+    'PhabricatorSlowvoteQuestionTransaction' => 'applications/slowvote/xaction/PhabricatorSlowvoteQuestionTransaction.php',
     'PhabricatorSlowvoteReplyHandler' => 'applications/slowvote/mail/PhabricatorSlowvoteReplyHandler.php',
-    'PhabricatorSlowvoteResponsesTransaction' => 'applications/slowvote/xactions/PhabricatorSlowvoteResponsesTransaction.php',
+    'PhabricatorSlowvoteResponsesTransaction' => 'applications/slowvote/xaction/PhabricatorSlowvoteResponsesTransaction.php',
     'PhabricatorSlowvoteSchemaSpec' => 'applications/slowvote/storage/PhabricatorSlowvoteSchemaSpec.php',
     'PhabricatorSlowvoteSearchEngine' => 'applications/slowvote/query/PhabricatorSlowvoteSearchEngine.php',
-    'PhabricatorSlowvoteShuffleTransaction' => 'applications/slowvote/xactions/PhabricatorSlowvoteShuffleTransaction.php',
+    'PhabricatorSlowvoteShuffleTransaction' => 'applications/slowvote/xaction/PhabricatorSlowvoteShuffleTransaction.php',
     'PhabricatorSlowvoteTransaction' => 'applications/slowvote/storage/PhabricatorSlowvoteTransaction.php',
     'PhabricatorSlowvoteTransactionComment' => 'applications/slowvote/storage/PhabricatorSlowvoteTransactionComment.php',
     'PhabricatorSlowvoteTransactionQuery' => 'applications/slowvote/query/PhabricatorSlowvoteTransactionQuery.php',
-    'PhabricatorSlowvoteTransactionType' => 'applications/slowvote/xactions/PhabricatorSlowvoteTransactionType.php',
+    'PhabricatorSlowvoteTransactionType' => 'applications/slowvote/xaction/PhabricatorSlowvoteTransactionType.php',
     'PhabricatorSlowvoteVoteController' => 'applications/slowvote/controller/PhabricatorSlowvoteVoteController.php',
     'PhabricatorSlug' => 'infrastructure/util/PhabricatorSlug.php',
     'PhabricatorSlugTestCase' => 'infrastructure/util/__tests__/PhabricatorSlugTestCase.php',

src/applications/slowvote/xaction/PhabricatorSlowvoteDescriptionTransaction.php

@@ -36,15 +36,21 @@ final class PhabricatorSlowvoteDescriptionTransaction
     }
   }
 
-  public function hasChangeDetails() {
+  public function hasChangeDetailView() {
     return true;
   }
 
+  public function getMailDiffSectionHeader() {
+    return pht('CHANGES TO POLL DESCRIPTION');
+  }
+
   public function newChangeDetailView() {
-    return $this->renderTextCorpusChangeDetails(
-      $this->getViewer(),
-      $this->getOldValue(),
-      $this->getNewValue());
+    $viewer = $this->getViewer();
+
+    return id(new PhabricatorApplicationTransactionTextDiffDetailView())
+      ->setViewer($viewer)
+      ->setOldText($this->getOldValue())
+      ->setNewText($this->getNewValue());
   }
 
   public function newRemarkupChanges() {