Transactions - add pagination to application transactions

Summary: Ref T4712. This adds pagination. Future diffs will need to deploy `buildTransactionTimeline` everywhere and massage this stuff as necessary if we hit any special cases.

Test Plan: Set page size to "5" to make it need to paginate often. Verified proper transactions loaded in and the javascript actions worked.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T4712

Differential Revision: https://secure.phabricator.com/D10887

src/applications/base/controller/PhabricatorController.php

@@ -535,11 +535,18 @@ abstract class PhabricatorController extends AphrontController {
     $xaction = $object->getApplicationTransactionTemplate();
     $view = $xaction->getApplicationTransactionViewObject();
 
+    $pager = id(new AphrontCursorPagerView())
+      ->readFromRequest($this->getRequest())
+      ->setURI(new PhutilURI(
+        '/transactions/showolder/'.$object->getPHID().'/'));
+
     $xactions = $query
       ->setViewer($viewer)
       ->withObjectPHIDs(array($object->getPHID()))
       ->needComments(true)
-      ->execute();
+      ->setReversePaging(false)
+      ->executeWithCursorPager($pager);
+    $xactions = array_reverse($xactions);
 
     if ($engine) {
       foreach ($xactions as $xaction) {
@@ -556,7 +563,8 @@ abstract class PhabricatorController extends AphrontController {
     $timeline = $view
       ->setUser($viewer)
       ->setObjectPHID($object->getPHID())
-      ->setTransactions($xactions);
+      ->setTransactions($xactions)
+      ->setPager($pager);
 
     return $timeline;
   }