diff --git a/src/applications/maniphest/controller/ManiphestTaskDetailController.php b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
index dbd2e20bb5..67ce31ead8 100644
--- a/src/applications/maniphest/controller/ManiphestTaskDetailController.php
+++ b/src/applications/maniphest/controller/ManiphestTaskDetailController.php
@@ -1,612 +1,641 @@
 <?php
 
-/**
- * @group maniphest
- */
 final class ManiphestTaskDetailController extends ManiphestController {
 
   private $id;
 
+  public function shouldAllowPublic() {
+    return true;
+  }
+
   public function willProcessRequest(array $data) {
     $this->id = $data['id'];
   }
 
   public function processRequest() {
 
     $request = $this->getRequest();
     $user = $request->getUser();
 
     $e_title = null;
 
     $priority_map = ManiphestTaskPriority::getTaskPriorityMap();
 
     $task = id(new ManiphestTaskQuery())
       ->setViewer($user)
       ->withIDs(array($this->id))
       ->executeOne();
     if (!$task) {
       return new Aphront404Response();
     }
 
     $workflow = $request->getStr('workflow');
     $parent_task = null;
     if ($workflow && is_numeric($workflow)) {
       $parent_task = id(new ManiphestTaskQuery())
         ->setViewer($user)
         ->withIDs(array($workflow))
         ->executeOne();
     }
 
     $transactions = id(new ManiphestTransactionQuery())
       ->setViewer($user)
       ->withObjectPHIDs(array($task->getPHID()))
       ->needComments(true)
       ->execute();
 
     $field_list = PhabricatorCustomField::getObjectFields(
       $task,
       PhabricatorCustomField::ROLE_VIEW);
 
     foreach ($field_list->getFields() as $field) {
       $field->setObject($task);
       $field->setViewer($user);
     }
 
     $field_list->readFieldsFromStorage($task);
 
     $aux_fields = $field_list->getFields();
 
     $e_commit = PhabricatorEdgeConfig::TYPE_TASK_HAS_COMMIT;
     $e_dep_on = PhabricatorEdgeConfig::TYPE_TASK_DEPENDS_ON_TASK;
     $e_dep_by = PhabricatorEdgeConfig::TYPE_TASK_DEPENDED_ON_BY_TASK;
     $e_rev    = PhabricatorEdgeConfig::TYPE_TASK_HAS_RELATED_DREV;
     $e_mock   = PhabricatorEdgeConfig::TYPE_TASK_HAS_MOCK;
 
     $phid = $task->getPHID();
 
     $query = id(new PhabricatorEdgeQuery())
       ->withSourcePHIDs(array($phid))
       ->withEdgeTypes(
         array(
           $e_commit,
           $e_dep_on,
           $e_dep_by,
           $e_rev,
           $e_mock,
         ));
     $edges = idx($query->execute(), $phid);
     $phids = array_fill_keys($query->getDestinationPHIDs(), true);
 
     foreach ($task->getCCPHIDs() as $phid) {
       $phids[$phid] = true;
     }
     foreach ($task->getProjectPHIDs() as $phid) {
       $phids[$phid] = true;
     }
     if ($task->getOwnerPHID()) {
       $phids[$task->getOwnerPHID()] = true;
     }
     $phids[$task->getAuthorPHID()] = true;
 
     $attached = $task->getAttached();
     foreach ($attached as $type => $list) {
       foreach ($list as $phid => $info) {
         $phids[$phid] = true;
       }
     }
 
     if ($parent_task) {
       $phids[$parent_task->getPHID()] = true;
     }
 
     $phids = array_keys($phids);
 
     $this->loadHandles($phids);
 
     $handles = $this->getLoadedHandles();
 
     $context_bar = null;
 
     if ($parent_task) {
       $context_bar = new AphrontContextBarView();
       $context_bar->addButton(phutil_tag(
       'a',
       array(
         'href' => '/maniphest/task/create/?parent='.$parent_task->getID(),
         'class' => 'green button',
       ),
       pht('Create Another Subtask')));
       $context_bar->appendChild(hsprintf(
         'Created a subtask of <strong>%s</strong>',
         $this->getHandle($parent_task->getPHID())->renderLink()));
     } else if ($workflow == 'create') {
       $context_bar = new AphrontContextBarView();
       $context_bar->addButton(phutil_tag('label', array(), 'Create Another'));
       $context_bar->addButton(phutil_tag(
         'a',
         array(
           'href' => '/maniphest/task/create/?template='.$task->getID(),
           'class' => 'green button',
         ),
         pht('Similar Task')));
       $context_bar->addButton(phutil_tag(
         'a',
         array(
           'href' => '/maniphest/task/create/',
           'class' => 'green button',
         ),
         pht('Empty Task')));
       $context_bar->appendChild(pht('New task created.'));
     }
 
     $engine = new PhabricatorMarkupEngine();
     $engine->setViewer($user);
     $engine->addObject($task, ManiphestTask::MARKUP_FIELD_DESCRIPTION);
     foreach ($transactions as $modern_xaction) {
       if ($modern_xaction->getComment()) {
         $engine->addObject(
           $modern_xaction->getComment(),
           PhabricatorApplicationTransactionComment::MARKUP_FIELD_COMMENT);
       }
     }
 
     $engine->process();
 
     $resolution_types = ManiphestTaskStatus::getTaskStatusMap();
 
     $transaction_types = array(
       PhabricatorTransactions::TYPE_COMMENT => pht('Comment'),
       ManiphestTransaction::TYPE_STATUS     => pht('Close Task'),
       ManiphestTransaction::TYPE_OWNER      => pht('Reassign / Claim'),
       ManiphestTransaction::TYPE_CCS        => pht('Add CCs'),
       ManiphestTransaction::TYPE_PRIORITY   => pht('Change Priority'),
       ManiphestTransaction::TYPE_ATTACH     => pht('Upload File'),
       ManiphestTransaction::TYPE_PROJECTS   => pht('Associate Projects'),
     );
 
     if ($task->getStatus() == ManiphestTaskStatus::STATUS_OPEN) {
       $resolution_types = array_select_keys(
         $resolution_types,
         array(
           ManiphestTaskStatus::STATUS_CLOSED_RESOLVED,
           ManiphestTaskStatus::STATUS_CLOSED_WONTFIX,
           ManiphestTaskStatus::STATUS_CLOSED_INVALID,
           ManiphestTaskStatus::STATUS_CLOSED_SPITE,
         ));
     } else {
       $resolution_types = array(
         ManiphestTaskStatus::STATUS_OPEN => 'Reopened',
       );
       $transaction_types[ManiphestTransaction::TYPE_STATUS] =
         'Reopen Task';
       unset($transaction_types[ManiphestTransaction::TYPE_PRIORITY]);
       unset($transaction_types[ManiphestTransaction::TYPE_OWNER]);
     }
 
     $default_claim = array(
       $user->getPHID() => $user->getUsername().' ('.$user->getRealName().')',
     );
 
     $draft = id(new PhabricatorDraft())->loadOneWhere(
       'authorPHID = %s AND draftKey = %s',
       $user->getPHID(),
       $task->getPHID());
     if ($draft) {
       $draft_text = $draft->getDraft();
     } else {
       $draft_text = null;
     }
 
     $is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');
 
     if ($is_serious) {
       // Prevent tasks from being closed "out of spite" in serious business
       // installs.
       unset($resolution_types[ManiphestTaskStatus::STATUS_CLOSED_SPITE]);
     }
 
     $comment_form = new AphrontFormView();
     $comment_form
       ->setUser($user)
       ->setShaded(true)
       ->setAction('/maniphest/transaction/save/')
       ->setEncType('multipart/form-data')
       ->addHiddenInput('taskID', $task->getID())
       ->appendChild(
         id(new AphrontFormSelectControl())
           ->setLabel(pht('Action'))
           ->setName('action')
           ->setOptions($transaction_types)
           ->setID('transaction-action'))
       ->appendChild(
         id(new AphrontFormSelectControl())
           ->setLabel(pht('Resolution'))
           ->setName('resolution')
           ->setControlID('resolution')
           ->setControlStyle('display: none')
           ->setOptions($resolution_types))
       ->appendChild(
         id(new AphrontFormTokenizerControl())
           ->setLabel(pht('Assign To'))
           ->setName('assign_to')
           ->setControlID('assign_to')
           ->setControlStyle('display: none')
           ->setID('assign-tokenizer')
           ->setDisableBehavior(true))
       ->appendChild(
         id(new AphrontFormTokenizerControl())
           ->setLabel(pht('CCs'))
           ->setName('ccs')
           ->setControlID('ccs')
           ->setControlStyle('display: none')
           ->setID('cc-tokenizer')
           ->setDisableBehavior(true))
       ->appendChild(
         id(new AphrontFormSelectControl())
           ->setLabel(pht('Priority'))
           ->setName('priority')
           ->setOptions($priority_map)
           ->setControlID('priority')
           ->setControlStyle('display: none')
           ->setValue($task->getPriority()))
       ->appendChild(
         id(new AphrontFormTokenizerControl())
           ->setLabel(pht('Projects'))
           ->setName('projects')
           ->setControlID('projects')
           ->setControlStyle('display: none')
           ->setID('projects-tokenizer')
           ->setDisableBehavior(true))
       ->appendChild(
         id(new AphrontFormFileControl())
           ->setLabel(pht('File'))
           ->setName('file')
           ->setControlID('file')
           ->setControlStyle('display: none'))
       ->appendChild(
         id(new PhabricatorRemarkupControl())
           ->setLabel(pht('Comments'))
           ->setName('comments')
           ->setValue($draft_text)
           ->setID('transaction-comments')
           ->setUser($user))
       ->appendChild(
         id(new AphrontFormSubmitControl())
           ->setValue($is_serious ? pht('Submit') : pht('Avast!')));
 
     $control_map = array(
       ManiphestTransaction::TYPE_STATUS   => 'resolution',
       ManiphestTransaction::TYPE_OWNER    => 'assign_to',
       ManiphestTransaction::TYPE_CCS      => 'ccs',
       ManiphestTransaction::TYPE_PRIORITY => 'priority',
       ManiphestTransaction::TYPE_PROJECTS => 'projects',
       ManiphestTransaction::TYPE_ATTACH   => 'file',
     );
 
     $tokenizer_map = array(
       ManiphestTransaction::TYPE_PROJECTS => array(
         'id'          => 'projects-tokenizer',
         'src'         => '/typeahead/common/projects/',
         'ondemand'    => PhabricatorEnv::getEnvConfig('tokenizer.ondemand'),
         'placeholder' => pht('Type a project name...'),
       ),
       ManiphestTransaction::TYPE_OWNER => array(
         'id'          => 'assign-tokenizer',
         'src'         => '/typeahead/common/users/',
         'value'       => $default_claim,
         'limit'       => 1,
         'ondemand'    => PhabricatorEnv::getEnvConfig('tokenizer.ondemand'),
         'placeholder' => pht('Type a user name...'),
       ),
       ManiphestTransaction::TYPE_CCS => array(
         'id'          => 'cc-tokenizer',
         'src'         => '/typeahead/common/mailable/',
         'ondemand'    => PhabricatorEnv::getEnvConfig('tokenizer.ondemand'),
         'placeholder' => pht('Type a user or mailing list...'),
       ),
     );
 
-    Javelin::initBehavior('maniphest-transaction-controls', array(
-      'select'     => 'transaction-action',
-      'controlMap' => $control_map,
-      'tokenizers' => $tokenizer_map,
-    ));
-
-    Javelin::initBehavior('maniphest-transaction-preview', array(
-      'uri'        => '/maniphest/transaction/preview/'.$task->getID().'/',
-      'preview'    => 'transaction-preview',
-      'comments'   => 'transaction-comments',
-      'action'     => 'transaction-action',
-      'map'        => $control_map,
-      'tokenizers' => $tokenizer_map,
-    ));
+    // TODO: Initializing these behaviors for logged out users fatals things.
+    if ($user->isLoggedIn()) {
+      Javelin::initBehavior('maniphest-transaction-controls', array(
+        'select'     => 'transaction-action',
+        'controlMap' => $control_map,
+        'tokenizers' => $tokenizer_map,
+      ));
+
+      Javelin::initBehavior('maniphest-transaction-preview', array(
+        'uri'        => '/maniphest/transaction/preview/'.$task->getID().'/',
+        'preview'    => 'transaction-preview',
+        'comments'   => 'transaction-comments',
+        'action'     => 'transaction-action',
+        'map'        => $control_map,
+        'tokenizers' => $tokenizer_map,
+      ));
+    }
 
     $comment_header = id(new PHUIHeaderView())
       ->setHeader($is_serious ? pht('Add Comment') : pht('Weigh In'));
 
     $preview_panel = hsprintf(
       '<div class="aphront-panel-preview">
         <div id="transaction-preview">
           <div class="aphront-panel-preview-loading-text">%s</div>
         </div>
       </div>',
       pht('Loading preview...'));
 
     $timeline = id(new PhabricatorApplicationTransactionView())
       ->setUser($user)
       ->setObjectPHID($task->getPHID())
       ->setTransactions($transactions)
       ->setMarkupEngine($engine);
 
     $object_name = 'T'.$task->getID();
     $actions = $this->buildActionView($task);
 
     $crumbs = $this->buildApplicationCrumbs();
     $crumbs->addCrumb(
       id(new PhabricatorCrumbView())
         ->setName($object_name)
         ->setHref('/'.$object_name))
       ->setActionList($actions);
 
     $header = $this->buildHeaderView($task);
     $properties = $this->buildPropertyView($task, $field_list, $edges, $engine);
 
+    if (!$user->isLoggedIn()) {
+      // TODO: Eventually, everything should run through this. For now, we're
+      // only using it to get a consistent "Login to Comment" button.
+      $comment_form = id(new PhabricatorApplicationTransactionCommentView())
+        ->setUser($user)
+        ->setRequestURI($request->getRequestURI());
+      $preview_panel = null;
+    }
+
     return $this->buildApplicationPage(
       array(
         $crumbs,
         $context_bar,
         $header,
         $actions,
         $properties,
         $timeline,
         $comment_header,
         $comment_form,
         $preview_panel,
       ),
       array(
         'title' => 'T'.$task->getID().' '.$task->getTitle(),
         'pageObjects' => array($task->getPHID()),
         'device' => true,
       ));
   }
 
   private function buildHeaderView(ManiphestTask $task) {
     $view = id(new PHUIHeaderView())
       ->setHeader($task->getTitle())
       ->setUser($this->getRequest()->getUser())
       ->setPolicyObject($task);
 
     $status = $task->getStatus();
     $status_name = ManiphestTaskStatus::renderFullDescription($status);
 
     $view->addProperty(PHUIHeaderView::PROPERTY_STATUS, $status_name);
 
     return $view;
   }
 
 
   private function buildActionView(ManiphestTask $task) {
     $viewer = $this->getRequest()->getUser();
     $viewer_phid = $viewer->getPHID();
     $viewer_is_cc = in_array($viewer_phid, $task->getCCPHIDs());
 
     $id = $task->getID();
     $phid = $task->getPHID();
 
+    $can_edit = PhabricatorPolicyFilter::hasCapability(
+      $viewer,
+      $task,
+      PhabricatorPolicyCapability::CAN_EDIT);
+
     $view = id(new PhabricatorActionListView())
       ->setUser($viewer)
       ->setObject($task)
-      ->setObjectURI($this->getRequest()->getRequestURI())
-      ->addAction(
+      ->setObjectURI($this->getRequest()->getRequestURI());
+
+    $view->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Edit Task'))
         ->setIcon('edit')
-        ->setHref($this->getApplicationURI("/task/edit/{$id}/")));
+        ->setHref($this->getApplicationURI("/task/edit/{$id}/"))
+        ->setDisabled(!$can_edit)
+        ->setWorkflow(!$can_edit));
 
     if ($task->getOwnerPHID() === $viewer_phid) {
       $view->addAction(
         id(new PhabricatorActionView())
           ->setName(pht('Automatically Subscribed'))
           ->setDisabled(true)
           ->setIcon('enable'));
     } else {
       $action = $viewer_is_cc ? 'rem' : 'add';
       $name   = $viewer_is_cc ? pht('Unsubscribe') : pht('Subscribe');
       $icon   = $viewer_is_cc ? 'disable' : 'check';
 
       $view->addAction(
         id(new PhabricatorActionView())
           ->setName($name)
           ->setHref("/maniphest/subscribe/{$action}/{$id}/")
           ->setRenderAsForm(true)
           ->setUser($viewer)
           ->setIcon($icon));
     }
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Merge Duplicates In'))
         ->setHref("/search/attach/{$phid}/TASK/merge/")
         ->setWorkflow(true)
-        ->setIcon('merge'));
+        ->setIcon('merge')
+        ->setDisabled(!$can_edit)
+        ->setWorkflow(!$can_edit));
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Create Subtask'))
         ->setHref($this->getApplicationURI("/task/create/?parent={$id}"))
         ->setIcon('fork'));
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Edit Dependencies'))
         ->setHref("/search/attach/{$phid}/TASK/dependencies/")
         ->setWorkflow(true)
-        ->setIcon('link'));
+        ->setIcon('link')
+        ->setDisabled(!$can_edit)
+        ->setWorkflow(!$can_edit));
 
     $view->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Edit Differential Revisions'))
         ->setHref("/search/attach/{$phid}/DREV/")
         ->setWorkflow(true)
-        ->setIcon('attach'));
+        ->setIcon('attach')
+        ->setDisabled(!$can_edit)
+        ->setWorkflow(!$can_edit));
 
     $pholio_app =
       PhabricatorApplication::getByClass('PhabricatorApplicationPholio');
     if ($pholio_app->isInstalled()) {
       $view->addAction(
         id(new PhabricatorActionView())
         ->setName(pht('Edit Pholio Mocks'))
         ->setHref("/search/attach/{$phid}/MOCK/edge/")
         ->setWorkflow(true)
-        ->setIcon('attach'));
+        ->setIcon('attach')
+        ->setDisabled(!$can_edit)
+        ->setWorkflow(!$can_edit));
     }
 
     return $view;
   }
 
   private function buildPropertyView(
     ManiphestTask $task,
     PhabricatorCustomFieldList $field_list,
     array $edges,
     PhabricatorMarkupEngine $engine) {
 
     $viewer = $this->getRequest()->getUser();
 
     $view = id(new PhabricatorPropertyListView())
       ->setUser($viewer)
       ->setObject($task);
 
     $view->addProperty(
       pht('Assigned To'),
       $task->getOwnerPHID()
       ? $this->getHandle($task->getOwnerPHID())->renderLink()
       : phutil_tag('em', array(), pht('None')));
 
     $view->addProperty(
       pht('Priority'),
       ManiphestTaskPriority::getTaskPriorityName($task->getPriority()));
 
     $view->addProperty(
       pht('Subscribers'),
       $task->getCCPHIDs()
       ? $this->renderHandlesForPHIDs($task->getCCPHIDs(), ',')
       : phutil_tag('em', array(), pht('None')));
 
     $view->addProperty(
       pht('Author'),
       $this->getHandle($task->getAuthorPHID())->renderLink());
 
     $source = $task->getOriginalEmailSource();
     if ($source) {
       $subject = '[T'.$task->getID().'] '.$task->getTitle();
       $view->addProperty(
         pht('From Email'),
         phutil_tag(
           'a',
           array(
             'href' => 'mailto:'.$source.'?subject='.$subject
           ),
           $source));
     }
 
     $view->addProperty(
       pht('Projects'),
       $task->getProjectPHIDs()
       ? $this->renderHandlesForPHIDs($task->getProjectPHIDs(), ',')
       : phutil_tag('em', array(), pht('None')));
 
     $edge_types = array(
       PhabricatorEdgeConfig::TYPE_TASK_DEPENDED_ON_BY_TASK
       => pht('Dependent Tasks'),
       PhabricatorEdgeConfig::TYPE_TASK_DEPENDS_ON_TASK
       => pht('Depends On'),
       PhabricatorEdgeConfig::TYPE_TASK_HAS_RELATED_DREV
       => pht('Differential Revisions'),
       PhabricatorEdgeConfig::TYPE_TASK_HAS_MOCK
       => pht('Pholio Mocks'),
     );
 
     $revisions_commits = array();
     $handles = $this->getLoadedHandles();
 
     $commit_phids = array_keys(
       $edges[PhabricatorEdgeConfig::TYPE_TASK_HAS_COMMIT]);
     if ($commit_phids) {
       $commit_drev = PhabricatorEdgeConfig::TYPE_COMMIT_HAS_DREV;
       $drev_edges = id(new PhabricatorEdgeQuery())
         ->withSourcePHIDs($commit_phids)
         ->withEdgeTypes(array($commit_drev))
         ->execute();
 
       foreach ($commit_phids as $phid) {
         $revisions_commits[$phid] = $handles[$phid]->renderLink();
         $revision_phid = key($drev_edges[$phid][$commit_drev]);
         $revision_handle = idx($handles, $revision_phid);
         if ($revision_handle) {
           $task_drev = PhabricatorEdgeConfig::TYPE_TASK_HAS_RELATED_DREV;
           unset($edges[$task_drev][$revision_phid]);
           $revisions_commits[$phid] = hsprintf(
             '%s / %s',
             $revision_handle->renderLink($revision_handle->getName()),
             $revisions_commits[$phid]);
         }
       }
     }
 
     foreach ($edge_types as $edge_type => $edge_name) {
       if ($edges[$edge_type]) {
         $view->addProperty(
           $edge_name,
           $this->renderHandlesForPHIDs(array_keys($edges[$edge_type])));
       }
     }
 
     if ($revisions_commits) {
       $view->addProperty(
         pht('Commits'),
         phutil_implode_html(phutil_tag('br'), $revisions_commits));
     }
 
     $attached = $task->getAttached();
     if (!is_array($attached)) {
       $attached = array();
     }
 
     $file_infos = idx($attached, PhabricatorFilePHIDTypeFile::TYPECONST);
     if ($file_infos) {
       $file_phids = array_keys($file_infos);
 
       $files = id(new PhabricatorFile())->loadAllWhere(
         'phid IN (%Ls)',
         $file_phids);
 
       $file_view = new PhabricatorFileLinkListView();
       $file_view->setFiles($files);
 
       $view->addProperty(
         pht('Files'),
         $file_view->render());
     }
 
     $field_list->appendFieldsToPropertyList(
       $task,
       $viewer,
       $view);
 
     $view->invokeWillRenderEvent();
 
     if (strlen($task->getDescription())) {
       $view->addSectionHeader(pht('Description'));
       $view->addTextContent(
         phutil_tag(
           'div',
           array(
             'class' => 'phabricator-remarkup',
           ),
           $engine->getOutput($task, ManiphestTask::MARKUP_FIELD_DESCRIPTION)));
     }
 
     return $view;
   }
 
 }
diff --git a/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentHistoryController.php b/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentHistoryController.php
index b7fa42486e..c1243a5548 100644
--- a/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentHistoryController.php
+++ b/src/applications/transactions/controller/PhabricatorApplicationTransactionCommentHistoryController.php
@@ -1,77 +1,81 @@
 <?php
 
 final class PhabricatorApplicationTransactionCommentHistoryController
   extends PhabricatorApplicationTransactionController {
 
   private $phid;
 
+  public function shouldAllowPublic() {
+    return true;
+  }
+
   public function willProcessRequest(array $data) {
     $this->phid = $data['phid'];
   }
 
   public function processRequest() {
     $request = $this->getRequest();
     $user = $request->getUser();
 
     $xaction = id(new PhabricatorObjectQuery())
       ->withPHIDs(array($this->phid))
       ->setViewer($user)
       ->executeOne();
 
     if (!$xaction) {
       return new Aphront404Response();
     }
 
     if (!$xaction->getComment()) {
       // You can't view history of a transaction with no comments.
       return new Aphront404Response();
     }
 
     $comments = id(new PhabricatorApplicationTransactionCommentQuery())
       ->setViewer($user)
       ->setTemplate($xaction->getApplicationTransactionCommentObject())
       ->withTransactionPHIDs(array($xaction->getPHID()))
       ->execute();
 
     if (!$comments) {
       return new Aphront404Response();
     }
 
     $comments = msort($comments, 'getCommentVersion');
 
     $xactions = array();
     foreach ($comments as $comment) {
       $xactions[] = id(clone $xaction)
         ->makeEphemeral()
         ->setCommentVersion($comment->getCommentVersion())
         ->setContentSource($comment->getContentSource())
         ->setDateCreated($comment->getDateCreated())
         ->attachComment($comment);
     }
 
     $obj_phid = $xaction->getObjectPHID();
     $obj_handle = id(new PhabricatorHandleQuery())
       ->setViewer($user)
       ->withPHIDs(array($obj_phid))
       ->executeOne();
 
     $view = id(new PhabricatorApplicationTransactionView())
       ->setUser($user)
       ->setObjectPHID($obj_phid)
       ->setTransactions($xactions)
       ->setShowEditActions(false);
 
     $dialog = id(new AphrontDialogView())
       ->setUser($user)
       ->setWidth(AphrontDialogView::WIDTH_FULL)
       ->setTitle(pht('Comment History'));
 
     $dialog->appendChild($view);
 
     $dialog
       ->addCancelButton($obj_handle->getURI());
 
     return id(new AphrontDialogResponse())->setDialog($dialog);
   }
 
 }