diff --git a/src/applications/calendar/controller/PhabricatorCalendarEventEditController.php b/src/applications/calendar/controller/PhabricatorCalendarEventEditController.php
index 3211d8052b..928526f33f 100644
--- a/src/applications/calendar/controller/PhabricatorCalendarEventEditController.php
+++ b/src/applications/calendar/controller/PhabricatorCalendarEventEditController.php
@@ -1,75 +1,84 @@
 <?php
 
 final class PhabricatorCalendarEventEditController
   extends PhabricatorCalendarController {
 
   public function handleRequest(AphrontRequest $request) {
     $viewer = $this->getViewer();
 
     $engine = id(new PhabricatorCalendarEventEditEngine())
       ->setController($this);
 
     $id = $request->getURIData('id');
     if ($id) {
       $event = id(new PhabricatorCalendarEventQuery())
         ->setViewer($viewer)
         ->withIDs(array($id))
         ->executeOne();
       $response = $this->newImportedEventResponse($event);
       if ($response) {
         return $response;
       }
 
       $cancel_uri = $event->getURI();
 
       $page = $request->getURIData('pageKey');
       if ($page == 'recurring') {
         if ($event->isChildEvent()) {
           return $this->newDialog()
             ->setTitle(pht('Series Event'))
             ->appendParagraph(
               pht(
                 'This event is an instance in an event series. To change '.
                 'the behavior for the series, edit the parent event.'))
             ->addCancelButton($cancel_uri);
         }
       } else if ($event->getIsRecurring()) {
-        $mode = $request->getStr('mode');
+
+        // If the user submits a comment or makes an edit via comment actions,
+        // always target only the current event. It doesn't make sense to add
+        // comments to every instance of an event, and the other actions don't
+        // make much sense to apply to all instances either.
+        if ($engine->isCommentAction()) {
+          $mode = PhabricatorCalendarEventEditEngine::MODE_THIS;
+        } else {
+          $mode = $request->getStr('mode');
+        }
+
         if (!$mode) {
           $form = id(new AphrontFormView())
             ->setViewer($viewer)
             ->appendControl(
               id(new AphrontFormSelectControl())
                 ->setLabel(pht('Edit Events'))
                 ->setName('mode')
                 ->setOptions(
                   array(
                     PhabricatorCalendarEventEditEngine::MODE_THIS
                       => pht('Edit Only This Event'),
                     PhabricatorCalendarEventEditEngine::MODE_FUTURE
                       => pht('Edit All Future Events'),
                   )));
 
           return $this->newDialog()
             ->setTitle(pht('Edit Event'))
             ->appendParagraph(
               pht(
                 'This event is part of a series. Which events do you '.
                 'want to edit?'))
             ->appendForm($form)
             ->addSubmitButton(pht('Continue'))
             ->addCancelButton($cancel_uri)
             ->setDisableWorkflowOnSubmit(true);
-
         }
 
         $engine
           ->addContextParameter('mode', $mode)
           ->setSeriesEditMode($mode);
       }
     }
 
     return $engine->buildResponse();
   }
 
 }
diff --git a/src/applications/calendar/editor/PhabricatorCalendarEventEditEngine.php b/src/applications/calendar/editor/PhabricatorCalendarEventEditEngine.php
index f877bd9d13..c56cd7febb 100644
--- a/src/applications/calendar/editor/PhabricatorCalendarEventEditEngine.php
+++ b/src/applications/calendar/editor/PhabricatorCalendarEventEditEngine.php
@@ -1,369 +1,401 @@
 <?php
 
 final class PhabricatorCalendarEventEditEngine
   extends PhabricatorEditEngine {
 
   const ENGINECONST = 'calendar.event';
 
   private $rawTransactions;
   private $seriesEditMode = self::MODE_THIS;
 
   const MODE_THIS = 'this';
   const MODE_FUTURE = 'future';
 
   public function setSeriesEditMode($series_edit_mode) {
     $this->seriesEditMode = $series_edit_mode;
     return $this;
   }
 
   public function getSeriesEditMode() {
     return $this->seriesEditMode;
   }
 
   public function getEngineName() {
     return pht('Calendar Events');
   }
 
   public function getSummaryHeader() {
     return pht('Configure Calendar Event Forms');
   }
 
   public function getSummaryText() {
     return pht('Configure how users create and edit events.');
   }
 
   public function getEngineApplicationClass() {
     return 'PhabricatorCalendarApplication';
   }
 
   protected function newEditableObject() {
     return PhabricatorCalendarEvent::initializeNewCalendarEvent(
       $this->getViewer());
   }
 
   protected function newObjectQuery() {
     return new PhabricatorCalendarEventQuery();
   }
 
   protected function getObjectCreateTitleText($object) {
     return pht('Create New Event');
   }
 
   protected function getObjectEditTitleText($object) {
     return pht('Edit Event: %s', $object->getName());
   }
 
   protected function getObjectEditShortText($object) {
     return $object->getMonogram();
   }
 
   protected function getObjectCreateShortText() {
     return pht('Create Event');
   }
 
   protected function getObjectName() {
     return pht('Event');
   }
 
   protected function getObjectViewURI($object) {
     return $object->getURI();
   }
 
   protected function getEditorURI() {
     return $this->getApplication()->getApplicationURI('event/edit/');
   }
 
   protected function buildCustomEditFields($object) {
     $viewer = $this->getViewer();
 
     if ($this->getIsCreate()) {
       $invitee_phids = array($viewer->getPHID());
     } else {
       $invitee_phids = $object->getInviteePHIDsForEdit();
     }
 
     $frequency_map = PhabricatorCalendarEvent::getFrequencyMap();
     $frequency_options = ipull($frequency_map, 'label');
 
     $rrule = $object->newRecurrenceRule();
     if ($rrule) {
       $frequency = $rrule->getFrequency();
     } else {
       $frequency = null;
     }
 
     // At least for now, just hide "Invitees" when editing all future events.
     // This may eventually deserve a more nuanced approach.
     $hide_invitees = ($this->getSeriesEditMode() == self::MODE_FUTURE);
 
     $fields = array(
       id(new PhabricatorTextEditField())
         ->setKey('name')
         ->setLabel(pht('Name'))
         ->setDescription(pht('Name of the event.'))
         ->setIsRequired(true)
         ->setTransactionType(
           PhabricatorCalendarEventNameTransaction::TRANSACTIONTYPE)
         ->setConduitDescription(pht('Rename the event.'))
         ->setConduitTypeDescription(pht('New event name.'))
         ->setValue($object->getName()),
       id(new PhabricatorBoolEditField())
         ->setKey('isAllDay')
         ->setOptions(pht('Normal Event'), pht('All Day Event'))
         ->setAsCheckbox(true)
         ->setTransactionType(
           PhabricatorCalendarEventAllDayTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('Marks this as an all day event.'))
         ->setConduitDescription(pht('Make the event an all day event.'))
         ->setConduitTypeDescription(pht('Mark the event as an all day event.'))
         ->setValue($object->getIsAllDay()),
       id(new PhabricatorEpochEditField())
         ->setKey('start')
         ->setLabel(pht('Start'))
         ->setIsLockable(false)
         ->setIsDefaultable(false)
         ->setTransactionType(
           PhabricatorCalendarEventStartDateTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('Start time of the event.'))
         ->setConduitDescription(pht('Change the start time of the event.'))
         ->setConduitTypeDescription(pht('New event start time.'))
         ->setValue($object->getStartDateTimeEpoch()),
       id(new PhabricatorEpochEditField())
         ->setKey('end')
         ->setLabel(pht('End'))
         ->setIsLockable(false)
         ->setIsDefaultable(false)
         ->setTransactionType(
           PhabricatorCalendarEventEndDateTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('End time of the event.'))
         ->setConduitDescription(pht('Change the end time of the event.'))
         ->setConduitTypeDescription(pht('New event end time.'))
         ->setValue($object->newEndDateTimeForEdit()->getEpoch()),
       id(new PhabricatorBoolEditField())
         ->setKey('cancelled')
         ->setOptions(pht('Active'), pht('Cancelled'))
         ->setLabel(pht('Cancelled'))
         ->setDescription(pht('Cancel the event.'))
         ->setTransactionType(
           PhabricatorCalendarEventCancelTransaction::TRANSACTIONTYPE)
         ->setIsConduitOnly(true)
         ->setConduitDescription(pht('Cancel or restore the event.'))
         ->setConduitTypeDescription(pht('True to cancel the event.'))
         ->setValue($object->getIsCancelled()),
       id(new PhabricatorUsersEditField())
         ->setKey('hostPHID')
         ->setAliases(array('host'))
         ->setLabel(pht('Host'))
         ->setDescription(pht('Host of the event.'))
         ->setTransactionType(
           PhabricatorCalendarEventHostTransaction::TRANSACTIONTYPE)
         ->setIsConduitOnly($this->getIsCreate())
         ->setConduitDescription(pht('Change the host of the event.'))
         ->setConduitTypeDescription(pht('New event host.'))
         ->setSingleValue($object->getHostPHID()),
       id(new PhabricatorDatasourceEditField())
         ->setIsHidden($hide_invitees)
         ->setKey('inviteePHIDs')
         ->setAliases(array('invite', 'invitee', 'invitees', 'inviteePHID'))
         ->setLabel(pht('Invitees'))
         ->setDatasource(new PhabricatorMetaMTAMailableDatasource())
         ->setTransactionType(
           PhabricatorCalendarEventInviteTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('Users invited to the event.'))
         ->setConduitDescription(pht('Change invited users.'))
         ->setConduitTypeDescription(pht('New event invitees.'))
         ->setValue($invitee_phids)
         ->setCommentActionLabel(pht('Change Invitees')),
       id(new PhabricatorRemarkupEditField())
         ->setKey('description')
         ->setLabel(pht('Description'))
         ->setDescription(pht('Description of the event.'))
         ->setTransactionType(
           PhabricatorCalendarEventDescriptionTransaction::TRANSACTIONTYPE)
         ->setConduitDescription(pht('Update the event description.'))
         ->setConduitTypeDescription(pht('New event description.'))
         ->setValue($object->getDescription()),
       id(new PhabricatorIconSetEditField())
         ->setKey('icon')
         ->setLabel(pht('Icon'))
         ->setIconSet(new PhabricatorCalendarIconSet())
         ->setTransactionType(
           PhabricatorCalendarEventIconTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('Event icon.'))
         ->setConduitDescription(pht('Change the event icon.'))
         ->setConduitTypeDescription(pht('New event icon.'))
         ->setValue($object->getIcon()),
       id(new PhabricatorBoolEditField())
         ->setIsHidden($object->getIsRecurring())
         ->setKey('isRecurring')
         ->setLabel(pht('Recurring'))
         ->setOptions(pht('One-Time Event'), pht('Recurring Event'))
         ->setTransactionType(
           PhabricatorCalendarEventRecurringTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('One time or recurring event.'))
         ->setConduitDescription(pht('Make the event recurring.'))
         ->setConduitTypeDescription(pht('Mark the event as a recurring event.'))
         ->setValue($object->getIsRecurring()),
       id(new PhabricatorSelectEditField())
         ->setKey('frequency')
         ->setLabel(pht('Frequency'))
         ->setOptions($frequency_options)
         ->setTransactionType(
           PhabricatorCalendarEventFrequencyTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('Recurring event frequency.'))
         ->setConduitDescription(pht('Change the event frequency.'))
         ->setConduitTypeDescription(pht('New event frequency.'))
         ->setValue($frequency),
       id(new PhabricatorEpochEditField())
         ->setIsLockable(false)
         ->setIsDefaultable(false)
         ->setAllowNull(true)
         ->setHideTime($object->getIsAllDay())
         ->setKey('until')
         ->setLabel(pht('Repeat Until'))
         ->setTransactionType(
           PhabricatorCalendarEventUntilDateTransaction::TRANSACTIONTYPE)
         ->setDescription(pht('Last instance of the event.'))
         ->setConduitDescription(pht('Change when the event repeats until.'))
         ->setConduitTypeDescription(pht('New final event time.'))
         ->setValue($object->getUntilDateTimeEpoch()),
     );
 
     return $fields;
   }
 
   protected function willBuildEditForm($object, array $fields) {
     $all_day_field = idx($fields, 'isAllDay');
     $start_field = idx($fields, 'start');
     $end_field = idx($fields, 'end');
 
     if ($all_day_field) {
       $is_all_day = $all_day_field->getValueForTransaction();
 
       $control_ids = array();
       if ($start_field) {
         $control_ids[] = $start_field->getControlID();
       }
       if ($end_field) {
         $control_ids[] = $end_field->getControlID();
       }
 
       Javelin::initBehavior(
         'event-all-day',
         array(
           'allDayID' => $all_day_field->getControlID(),
           'controlIDs' => $control_ids,
         ));
 
     } else {
       $is_all_day = $object->getIsAllDay();
     }
 
     if ($is_all_day) {
       if ($start_field) {
         $start_field->setHideTime(true);
       }
 
       if ($end_field) {
         $end_field->setHideTime(true);
       }
     }
 
     return $fields;
   }
 
   protected function newPages($object) {
     // Controls for event recurrence behavior go on a separate page which we
     // put in a dialog. This simplifies event creation in the common case.
 
     return array(
       id(new PhabricatorEditPage())
         ->setKey('core')
         ->setLabel(pht('Core'))
         ->setIsDefault(true),
       id(new PhabricatorEditPage())
         ->setKey('recurring')
         ->setLabel(pht('Recurrence'))
         ->setFieldKeys(
           array(
             'isRecurring',
             'frequency',
             'until',
           )),
     );
   }
 
   protected function willApplyTransactions($object, array $xactions) {
     $viewer = $this->getViewer();
-    $this->rawTransactions = $xactions;
+    $this->rawTransactions = $this->cloneTransactions($xactions);
 
     $is_parent = $object->isParentEvent();
     $is_child = $object->isChildEvent();
     $is_future = ($this->getSeriesEditMode() === self::MODE_FUTURE);
 
     $must_fork = ($is_child && $is_future) ||
                  ($is_parent && !$is_future);
 
+    if ($is_parent && !$is_future) {
+      // We don't necessarily need to fork if whatever we're editing is not
+      // inherited by children. For example, we can add a comment to the parent
+      // event without needing to fork. Test all the stuff we're doing and see
+      // if anything is actually inherited.
+
+      $inherited_edit = false;
+      foreach ($xactions as $xaction) {
+        $modular_type = $xaction->getTransactionImplementation();
+        if ($modular_type instanceof PhabricatorCalendarEventTransactionType) {
+          $inherited_edit = $modular_type->isInheritedEdit();
+          if ($inherited_edit) {
+            break;
+          }
+        }
+      }
+
+      // Nothing the user is trying to do requires us to fork, so we can just
+      // apply the changes normally.
+      if (!$inherited_edit) {
+        $must_fork = false;
+      }
+    }
+
     if ($must_fork) {
       $fork_target = $object->loadForkTarget($viewer);
       if ($fork_target) {
         $fork_xaction = id(new PhabricatorCalendarEventTransaction())
           ->setTransactionType(
             PhabricatorCalendarEventForkTransaction::TRANSACTIONTYPE)
           ->setNewValue(true);
 
         if ($fork_target->getPHID() == $object->getPHID()) {
           // We're forking the object itself, so just slip it into the
           // transactions we're going to apply.
           array_unshift($xactions, $fork_xaction);
         } else {
           // Otherwise, we're forking a different object, so we have to
           // apply that separately.
           $this->applyTransactions($fork_target, array($fork_xaction));
         }
       }
     }
 
     return $xactions;
   }
 
   protected function didApplyTransactions($object, array $xactions) {
     $viewer = $this->getViewer();
 
     if ($this->getSeriesEditMode() !== self::MODE_FUTURE) {
       return;
     }
 
     $targets = $object->loadFutureEvents($viewer);
     if (!$targets) {
       return;
     }
 
     foreach ($targets as $target) {
-      $apply = clone $this->rawTransactions;
+      $apply = $this->cloneTransactions($this->rawTransactions);
       $this->applyTransactions($target, $apply);
     }
   }
 
   private function applyTransactions($target, array $xactions) {
     $viewer = $this->getViewer();
 
     // TODO: This isn't the most accurate source we could use, but this mode
     // is web-only for now.
     $content_source = PhabricatorContentSource::newForSource(
       PhabricatorWebContentSource::SOURCECONST);
 
     $editor = id(new PhabricatorCalendarEventEditor())
       ->setActor($viewer)
       ->setContentSource($content_source)
       ->setContinueOnNoEffect(true)
       ->setContinueOnMissingFields(true);
 
     try {
       $editor->applyTransactions($target, $xactions);
     } catch (PhabricatorApplicationTransactionValidationException $ex) {
       // Just ignore any issues we run into.
     }
   }
 
+  private function cloneTransactions(array $xactions) {
+    $result = array();
+    foreach ($xactions as $xaction) {
+      $result[] = clone $xaction;
+    }
+    return $result;
+  }
+
 }
diff --git a/src/applications/calendar/xaction/PhabricatorCalendarEventReplyTransaction.php b/src/applications/calendar/xaction/PhabricatorCalendarEventReplyTransaction.php
index e2ad9ea4be..2aad3d2bb2 100644
--- a/src/applications/calendar/xaction/PhabricatorCalendarEventReplyTransaction.php
+++ b/src/applications/calendar/xaction/PhabricatorCalendarEventReplyTransaction.php
@@ -1,33 +1,37 @@
 <?php
 
 abstract class PhabricatorCalendarEventReplyTransaction
   extends PhabricatorCalendarEventTransactionType {
 
   public function generateOldValue($object) {
     $actor_phid = $this->getActingAsPHID();
     return $object->getUserInviteStatus($actor_phid);
   }
 
+  public function isInheritedEdit() {
+    return false;
+  }
+
   public function applyExternalEffects($object, $value) {
     $acting_phid = $this->getActingAsPHID();
 
     $invitees = $object->getInvitees();
     $invitees = mpull($invitees, null, 'getInviteePHID');
 
     $invitee = idx($invitees, $acting_phid);
     if (!$invitee) {
       $invitee = id(new PhabricatorCalendarEventInvitee())
         ->setEventPHID($object->getPHID())
         ->setInviteePHID($acting_phid)
         ->setInviterPHID($acting_phid);
       $invitees[$acting_phid] = $invitee;
     }
 
     $invitee
       ->setStatus($value)
       ->save();
 
     $object->attachInvitees($invitees);
   }
 
 }
diff --git a/src/applications/calendar/xaction/PhabricatorCalendarEventTransactionType.php b/src/applications/calendar/xaction/PhabricatorCalendarEventTransactionType.php
index 53c00969e9..bcb1e13c21 100644
--- a/src/applications/calendar/xaction/PhabricatorCalendarEventTransactionType.php
+++ b/src/applications/calendar/xaction/PhabricatorCalendarEventTransactionType.php
@@ -1,4 +1,10 @@
 <?php
 
 abstract class PhabricatorCalendarEventTransactionType
-  extends PhabricatorModularTransactionType {}
+  extends PhabricatorModularTransactionType {
+
+  public function isInheritedEdit() {
+    return true;
+  }
+
+}
diff --git a/src/applications/transactions/editengine/PhabricatorEditEngine.php b/src/applications/transactions/editengine/PhabricatorEditEngine.php
index f22c113f8e..feb710295f 100644
--- a/src/applications/transactions/editengine/PhabricatorEditEngine.php
+++ b/src/applications/transactions/editengine/PhabricatorEditEngine.php
@@ -1,2221 +1,2232 @@
 <?php
 
 
 /**
  * @task fields Managing Fields
  * @task text Display Text
  * @task config Edit Engine Configuration
  * @task uri Managing URIs
  * @task load Creating and Loading Objects
  * @task web Responding to Web Requests
  * @task edit Responding to Edit Requests
  * @task http Responding to HTTP Parameter Requests
  * @task conduit Responding to Conduit Requests
  */
 abstract class PhabricatorEditEngine
   extends Phobject
   implements PhabricatorPolicyInterface {
 
   const EDITENGINECONFIG_DEFAULT = 'default';
 
   private $viewer;
   private $controller;
   private $isCreate;
   private $editEngineConfiguration;
   private $contextParameters = array();
   private $targetObject;
   private $page;
   private $pages;
   private $navigation;
   private $hideHeader;
 
   final public function setViewer(PhabricatorUser $viewer) {
     $this->viewer = $viewer;
     return $this;
   }
 
   final public function getViewer() {
     return $this->viewer;
   }
 
   final public function setController(PhabricatorController $controller) {
     $this->controller = $controller;
     $this->setViewer($controller->getViewer());
     return $this;
   }
 
   final public function getController() {
     return $this->controller;
   }
 
   final public function getEngineKey() {
     return $this->getPhobjectClassConstant('ENGINECONST', 64);
   }
 
   final public function getApplication() {
     $app_class = $this->getEngineApplicationClass();
     return PhabricatorApplication::getByClass($app_class);
   }
 
   final public function addContextParameter($key) {
     $this->contextParameters[] = $key;
     return $this;
   }
 
   public function isEngineConfigurable() {
     return true;
   }
 
   public function isEngineExtensible() {
     return true;
   }
 
   /**
    * Force the engine to edit a particular object.
    */
   public function setTargetObject($target_object) {
     $this->targetObject = $target_object;
     return $this;
   }
 
   public function getTargetObject() {
     return $this->targetObject;
   }
 
   public function setNavigation(AphrontSideNavFilterView $navigation) {
     $this->navigation = $navigation;
     return $this;
   }
 
   public function getNavigation() {
     return $this->navigation;
   }
 
   public function setHideHeader($hide_header) {
     $this->hideHeader = $hide_header;
     return $this;
   }
 
   public function getHideHeader() {
     return $this->hideHeader;
   }
 
 
 /* -(  Managing Fields  )---------------------------------------------------- */
 
 
   abstract public function getEngineApplicationClass();
   abstract protected function buildCustomEditFields($object);
 
   public function getFieldsForConfig(
     PhabricatorEditEngineConfiguration $config) {
 
     $object = $this->newEditableObject();
 
     $this->editEngineConfiguration = $config;
 
     // This is mostly making sure that we fill in default values.
     $this->setIsCreate(true);
 
     return $this->buildEditFields($object);
   }
 
   final protected function buildEditFields($object) {
     $viewer = $this->getViewer();
 
     $fields = $this->buildCustomEditFields($object);
 
     foreach ($fields as $field) {
       $field
         ->setViewer($viewer)
         ->setObject($object);
     }
 
     $fields = mpull($fields, null, 'getKey');
 
     if ($this->isEngineExtensible()) {
       $extensions = PhabricatorEditEngineExtension::getAllEnabledExtensions();
     } else {
       $extensions = array();
     }
 
     foreach ($extensions as $extension) {
       $extension->setViewer($viewer);
 
       if (!$extension->supportsObject($this, $object)) {
         continue;
       }
 
       $extension_fields = $extension->buildCustomEditFields($this, $object);
 
       // TODO: Validate this in more detail with a more tailored error.
       assert_instances_of($extension_fields, 'PhabricatorEditField');
 
       foreach ($extension_fields as $field) {
         $field
           ->setViewer($viewer)
           ->setObject($object);
       }
 
       $extension_fields = mpull($extension_fields, null, 'getKey');
 
       foreach ($extension_fields as $key => $field) {
         $fields[$key] = $field;
       }
     }
 
     $config = $this->getEditEngineConfiguration();
     $fields = $this->willConfigureFields($object, $fields);
     $fields = $config->applyConfigurationToFields($this, $object, $fields);
 
     $fields = $this->applyPageToFields($object, $fields);
 
     return $fields;
   }
 
   protected function willConfigureFields($object, array $fields) {
     return $fields;
   }
 
 
 /* -(  Display Text  )------------------------------------------------------- */
 
 
   /**
    * @task text
    */
   abstract public function getEngineName();
 
 
   /**
    * @task text
    */
   abstract protected function getObjectCreateTitleText($object);
 
   /**
    * @task text
    */
   protected function getFormHeaderText($object) {
     $config = $this->getEditEngineConfiguration();
     return $config->getName();
   }
 
   /**
    * @task text
    */
   abstract protected function getObjectEditTitleText($object);
 
 
   /**
    * @task text
    */
   abstract protected function getObjectCreateShortText();
 
 
   /**
    * @task text
    */
   abstract protected function getObjectName();
 
 
   /**
    * @task text
    */
   abstract protected function getObjectEditShortText($object);
 
 
   /**
    * @task text
    */
   protected function getObjectCreateButtonText($object) {
     return $this->getObjectCreateTitleText($object);
   }
 
 
   /**
    * @task text
    */
   protected function getObjectEditButtonText($object) {
     return pht('Save Changes');
   }
 
 
   /**
    * @task text
    */
   protected function getCommentViewSeriousHeaderText($object) {
     return pht('Take Action');
   }
 
 
   /**
    * @task text
    */
   protected function getCommentViewSeriousButtonText($object) {
     return pht('Submit');
   }
 
 
   /**
    * @task text
    */
   protected function getCommentViewHeaderText($object) {
     return $this->getCommentViewSeriousHeaderText($object);
   }
 
 
   /**
    * @task text
    */
   protected function getCommentViewButtonText($object) {
     return $this->getCommentViewSeriousButtonText($object);
   }
 
 
   /**
    * @task text
    */
   protected function getQuickCreateMenuHeaderText() {
     return $this->getObjectCreateShortText();
   }
 
 
   /**
    * Return a human-readable header describing what this engine is used to do,
    * like "Configure Maniphest Task Forms".
    *
    * @return string Human-readable description of the engine.
    * @task text
    */
   abstract public function getSummaryHeader();
 
 
   /**
    * Return a human-readable summary of what this engine is used to do.
    *
    * @return string Human-readable description of the engine.
    * @task text
    */
   abstract public function getSummaryText();
 
 
 
 
 /* -(  Edit Engine Configuration  )------------------------------------------ */
 
 
   protected function supportsEditEngineConfiguration() {
     return true;
   }
 
   final protected function getEditEngineConfiguration() {
     return $this->editEngineConfiguration;
   }
 
   private function newConfigurationQuery() {
     return id(new PhabricatorEditEngineConfigurationQuery())
       ->setViewer($this->getViewer())
       ->withEngineKeys(array($this->getEngineKey()));
   }
 
   private function loadEditEngineConfigurationWithQuery(
     PhabricatorEditEngineConfigurationQuery $query,
     $sort_method) {
 
     if ($sort_method) {
       $results = $query->execute();
       $results = msort($results, $sort_method);
       $result = head($results);
     } else {
       $result = $query->executeOne();
     }
 
     if (!$result) {
       return null;
     }
 
     $this->editEngineConfiguration = $result;
     return $result;
   }
 
   private function loadEditEngineConfigurationWithIdentifier($identifier) {
     $query = $this->newConfigurationQuery()
       ->withIdentifiers(array($identifier));
 
     return $this->loadEditEngineConfigurationWithQuery($query, null);
   }
 
   private function loadDefaultConfiguration() {
     $query = $this->newConfigurationQuery()
       ->withIdentifiers(
         array(
           self::EDITENGINECONFIG_DEFAULT,
         ))
       ->withIgnoreDatabaseConfigurations(true);
 
     return $this->loadEditEngineConfigurationWithQuery($query, null);
   }
 
   private function loadDefaultCreateConfiguration() {
     $query = $this->newConfigurationQuery()
       ->withIsDefault(true)
       ->withIsDisabled(false);
 
     return $this->loadEditEngineConfigurationWithQuery(
       $query,
       'getCreateSortKey');
   }
 
   public function loadDefaultEditConfiguration() {
     $query = $this->newConfigurationQuery()
       ->withIsEdit(true)
       ->withIsDisabled(false);
 
     return $this->loadEditEngineConfigurationWithQuery(
       $query,
       'getEditSortKey');
   }
 
   final public function getBuiltinEngineConfigurations() {
     $configurations = $this->newBuiltinEngineConfigurations();
 
     if (!$configurations) {
       throw new Exception(
         pht(
           'EditEngine ("%s") returned no builtin engine configurations, but '.
           'an edit engine must have at least one configuration.',
           get_class($this)));
     }
 
     assert_instances_of($configurations, 'PhabricatorEditEngineConfiguration');
 
     $has_default = false;
     foreach ($configurations as $config) {
       if ($config->getBuiltinKey() == self::EDITENGINECONFIG_DEFAULT) {
         $has_default = true;
       }
     }
 
     if (!$has_default) {
       $first = head($configurations);
       if (!$first->getBuiltinKey()) {
         $first
           ->setBuiltinKey(self::EDITENGINECONFIG_DEFAULT)
           ->setIsDefault(true)
           ->setIsEdit(true);
 
         if (!strlen($first->getName())) {
           $first->setName($this->getObjectCreateShortText());
         }
     } else {
         throw new Exception(
           pht(
             'EditEngine ("%s") returned builtin engine configurations, '.
             'but none are marked as default and the first configuration has '.
             'a different builtin key already. Mark a builtin as default or '.
             'omit the key from the first configuration',
             get_class($this)));
       }
     }
 
     $builtins = array();
     foreach ($configurations as $key => $config) {
       $builtin_key = $config->getBuiltinKey();
 
       if ($builtin_key === null) {
         throw new Exception(
           pht(
             'EditEngine ("%s") returned builtin engine configurations, '.
             'but one (with key "%s") is missing a builtin key. Provide a '.
             'builtin key for each configuration (you can omit it from the '.
             'first configuration in the list to automatically assign the '.
             'default key).',
             get_class($this),
             $key));
       }
 
       if (isset($builtins[$builtin_key])) {
         throw new Exception(
           pht(
             'EditEngine ("%s") returned builtin engine configurations, '.
             'but at least two specify the same builtin key ("%s"). Engines '.
             'must have unique builtin keys.',
             get_class($this),
             $builtin_key));
       }
 
       $builtins[$builtin_key] = $config;
     }
 
 
     return $builtins;
   }
 
   protected function newBuiltinEngineConfigurations() {
     return array(
       $this->newConfiguration(),
     );
   }
 
   final protected function newConfiguration() {
     return PhabricatorEditEngineConfiguration::initializeNewConfiguration(
       $this->getViewer(),
       $this);
   }
 
 
 /* -(  Managing URIs  )------------------------------------------------------ */
 
 
   /**
    * @task uri
    */
   abstract protected function getObjectViewURI($object);
 
 
   /**
    * @task uri
    */
   protected function getObjectCreateCancelURI($object) {
     return $this->getApplication()->getApplicationURI();
   }
 
 
   /**
    * @task uri
    */
   protected function getEditorURI() {
     return $this->getApplication()->getApplicationURI('edit/');
   }
 
 
   /**
    * @task uri
    */
   protected function getObjectEditCancelURI($object) {
     return $this->getObjectViewURI($object);
   }
 
 
   /**
    * @task uri
    */
   public function getEditURI($object = null, $path = null) {
     $parts = array();
 
     $parts[] = $this->getEditorURI();
 
     if ($object && $object->getID()) {
       $parts[] = $object->getID().'/';
     }
 
     if ($path !== null) {
       $parts[] = $path;
     }
 
     return implode('', $parts);
   }
 
   public function getEffectiveObjectViewURI($object) {
     if ($this->getIsCreate()) {
       return $this->getObjectViewURI($object);
     }
 
     $page = $this->getSelectedPage();
     if ($page) {
       $view_uri = $page->getViewURI();
       if ($view_uri !== null) {
         return $view_uri;
       }
     }
 
     return $this->getObjectViewURI($object);
   }
 
   public function getEffectiveObjectEditDoneURI($object) {
     return $this->getEffectiveObjectViewURI($object);
   }
 
   public function getEffectiveObjectEditCancelURI($object) {
     $page = $this->getSelectedPage();
     if ($page) {
       $view_uri = $page->getViewURI();
       if ($view_uri !== null) {
         return $view_uri;
       }
     }
 
     return $this->getObjectEditCancelURI($object);
   }
 
 
 /* -(  Creating and Loading Objects  )--------------------------------------- */
 
 
   /**
    * Initialize a new object for creation.
    *
    * @return object Newly initialized object.
    * @task load
    */
   abstract protected function newEditableObject();
 
 
   /**
    * Build an empty query for objects.
    *
    * @return PhabricatorPolicyAwareQuery Query.
    * @task load
    */
   abstract protected function newObjectQuery();
 
 
   /**
    * Test if this workflow is creating a new object or editing an existing one.
    *
    * @return bool True if a new object is being created.
    * @task load
    */
   final public function getIsCreate() {
     return $this->isCreate;
   }
 
 
   /**
    * Flag this workflow as a create or edit.
    *
    * @param bool True if this is a create workflow.
    * @return this
    * @task load
    */
   private function setIsCreate($is_create) {
     $this->isCreate = $is_create;
     return $this;
   }
 
 
   /**
    * Try to load an object by ID, PHID, or monogram. This is done primarily
    * to make Conduit a little easier to use.
    *
    * @param wild ID, PHID, or monogram.
    * @param list<const> List of required capability constants, or omit for
    *   defaults.
    * @return object Corresponding editable object.
    * @task load
    */
   private function newObjectFromIdentifier(
     $identifier,
     array $capabilities = array()) {
     if (is_int($identifier) || ctype_digit($identifier)) {
       $object = $this->newObjectFromID($identifier, $capabilities);
 
       if (!$object) {
         throw new Exception(
           pht(
             'No object exists with ID "%s".',
             $identifier));
       }
 
       return $object;
     }
 
     $type_unknown = PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN;
     if (phid_get_type($identifier) != $type_unknown) {
       $object = $this->newObjectFromPHID($identifier, $capabilities);
 
       if (!$object) {
         throw new Exception(
           pht(
             'No object exists with PHID "%s".',
             $identifier));
       }
 
       return $object;
     }
 
     $target = id(new PhabricatorObjectQuery())
       ->setViewer($this->getViewer())
       ->withNames(array($identifier))
       ->executeOne();
     if (!$target) {
       throw new Exception(
         pht(
           'Monogram "%s" does not identify a valid object.',
           $identifier));
     }
 
     $expect = $this->newEditableObject();
     $expect_class = get_class($expect);
     $target_class = get_class($target);
     if ($expect_class !== $target_class) {
       throw new Exception(
         pht(
           'Monogram "%s" identifies an object of the wrong type. Loaded '.
           'object has class "%s", but this editor operates on objects of '.
           'type "%s".',
           $identifier,
           $target_class,
           $expect_class));
     }
 
     // Load the object by PHID using this engine's standard query. This makes
     // sure it's really valid, goes through standard policy check logic, and
     // picks up any `need...()` clauses we want it to load with.
 
     $object = $this->newObjectFromPHID($target->getPHID(), $capabilities);
     if (!$object) {
       throw new Exception(
         pht(
           'Failed to reload object identified by monogram "%s" when '.
           'querying by PHID.',
           $identifier));
     }
 
     return $object;
   }
 
   /**
    * Load an object by ID.
    *
    * @param int Object ID.
    * @param list<const> List of required capability constants, or omit for
    *   defaults.
    * @return object|null Object, or null if no such object exists.
    * @task load
    */
   private function newObjectFromID($id, array $capabilities = array()) {
     $query = $this->newObjectQuery()
       ->withIDs(array($id));
 
     return $this->newObjectFromQuery($query, $capabilities);
   }
 
 
   /**
    * Load an object by PHID.
    *
    * @param phid Object PHID.
    * @param list<const> List of required capability constants, or omit for
    *   defaults.
    * @return object|null Object, or null if no such object exists.
    * @task load
    */
   private function newObjectFromPHID($phid, array $capabilities = array()) {
     $query = $this->newObjectQuery()
       ->withPHIDs(array($phid));
 
     return $this->newObjectFromQuery($query, $capabilities);
   }
 
 
   /**
    * Load an object given a configured query.
    *
    * @param PhabricatorPolicyAwareQuery Configured query.
    * @param list<const> List of required capabilitiy constants, or omit for
    *  defaults.
    * @return object|null Object, or null if no such object exists.
    * @task load
    */
   private function newObjectFromQuery(
     PhabricatorPolicyAwareQuery $query,
     array $capabilities = array()) {
 
     $viewer = $this->getViewer();
 
     if (!$capabilities) {
       $capabilities = array(
         PhabricatorPolicyCapability::CAN_VIEW,
         PhabricatorPolicyCapability::CAN_EDIT,
       );
     }
 
     $object = $query
       ->setViewer($viewer)
       ->requireCapabilities($capabilities)
       ->executeOne();
     if (!$object) {
       return null;
     }
 
     return $object;
   }
 
 
   /**
    * Verify that an object is appropriate for editing.
    *
    * @param wild Loaded value.
    * @return void
    * @task load
    */
   private function validateObject($object) {
     if (!$object || !is_object($object)) {
       throw new Exception(
         pht(
           'EditEngine "%s" created or loaded an invalid object: object must '.
           'actually be an object, but is of some other type ("%s").',
           get_class($this),
           gettype($object)));
     }
 
     if (!($object instanceof PhabricatorApplicationTransactionInterface)) {
       throw new Exception(
         pht(
           'EditEngine "%s" created or loaded an invalid object: object (of '.
           'class "%s") must implement "%s", but does not.',
           get_class($this),
           get_class($object),
           'PhabricatorApplicationTransactionInterface'));
     }
   }
 
 
 /* -(  Responding to Web Requests  )----------------------------------------- */
 
 
   final public function buildResponse() {
     $viewer = $this->getViewer();
     $controller = $this->getController();
     $request = $controller->getRequest();
 
-    $action = $request->getURIData('editAction');
+    $action = $this->getEditAction();
 
     $capabilities = array();
     $use_default = false;
     $require_create = true;
     switch ($action) {
       case 'comment':
         $capabilities = array(
           PhabricatorPolicyCapability::CAN_VIEW,
         );
         $use_default = true;
         break;
       case 'parameters':
         $use_default = true;
         break;
       case 'nodefault':
       case 'nocreate':
       case 'nomanage':
         $require_create = false;
         break;
       default:
         break;
     }
 
     $object = $this->getTargetObject();
     if (!$object) {
       $id = $request->getURIData('id');
 
       if ($id) {
         $this->setIsCreate(false);
         $object = $this->newObjectFromID($id, $capabilities);
         if (!$object) {
           return new Aphront404Response();
         }
       } else {
         // Make sure the viewer has permission to create new objects of
         // this type if we're going to create a new object.
         if ($require_create) {
           $this->requireCreateCapability();
         }
 
         $this->setIsCreate(true);
         $object = $this->newEditableObject();
       }
     } else {
       $id = $object->getID();
     }
 
     $this->validateObject($object);
 
     if ($use_default) {
       $config = $this->loadDefaultConfiguration();
       if (!$config) {
         return new Aphront404Response();
       }
     } else {
       $form_key = $request->getURIData('formKey');
       if (strlen($form_key)) {
         $config = $this->loadEditEngineConfigurationWithIdentifier($form_key);
 
         if (!$config) {
           return new Aphront404Response();
         }
 
         if ($id && !$config->getIsEdit()) {
           return $this->buildNotEditFormRespose($object, $config);
         }
       } else {
         if ($id) {
           $config = $this->loadDefaultEditConfiguration();
           if (!$config) {
             return $this->buildNoEditResponse($object);
           }
         } else {
           $config = $this->loadDefaultCreateConfiguration();
           if (!$config) {
             return $this->buildNoCreateResponse($object);
           }
         }
       }
     }
 
     if ($config->getIsDisabled()) {
       return $this->buildDisabledFormResponse($object, $config);
     }
 
     $page_key = $request->getURIData('pageKey');
     if (!strlen($page_key)) {
       $pages = $this->getPages($object);
       if ($pages) {
         $page_key = head_key($pages);
       }
     }
 
     if (strlen($page_key)) {
       $page = $this->selectPage($object, $page_key);
       if (!$page) {
         return new Aphront404Response();
       }
     }
 
     switch ($action) {
       case 'parameters':
         return $this->buildParametersResponse($object);
       case 'nodefault':
         return $this->buildNoDefaultResponse($object);
       case 'nocreate':
         return $this->buildNoCreateResponse($object);
       case 'nomanage':
         return $this->buildNoManageResponse($object);
       case 'comment':
         return $this->buildCommentResponse($object);
       default:
         return $this->buildEditResponse($object);
     }
   }
 
   private function buildCrumbs($object, $final = false) {
     $controller = $this->getController();
 
     $crumbs = $controller->buildApplicationCrumbsForEditEngine();
     if ($this->getIsCreate()) {
       $create_text = $this->getObjectCreateShortText();
       if ($final) {
         $crumbs->addTextCrumb($create_text);
       } else {
         $edit_uri = $this->getEditURI($object);
         $crumbs->addTextCrumb($create_text, $edit_uri);
       }
     } else {
       $crumbs->addTextCrumb(
         $this->getObjectEditShortText($object),
         $this->getEffectiveObjectViewURI($object));
 
       $edit_text = pht('Edit');
       if ($final) {
         $crumbs->addTextCrumb($edit_text);
       } else {
         $edit_uri = $this->getEditURI($object);
         $crumbs->addTextCrumb($edit_text, $edit_uri);
       }
     }
 
     return $crumbs;
   }
 
   private function buildEditResponse($object) {
     $viewer = $this->getViewer();
     $controller = $this->getController();
     $request = $controller->getRequest();
 
     $fields = $this->buildEditFields($object);
     $template = $object->getApplicationTransactionTemplate();
 
     $validation_exception = null;
     if ($request->isFormPost() && $request->getBool('editEngine')) {
       $submit_fields = $fields;
 
       foreach ($submit_fields as $key => $field) {
         if (!$field->shouldGenerateTransactionsFromSubmit()) {
           unset($submit_fields[$key]);
           continue;
         }
       }
 
       // Before we read the submitted values, store a copy of what we would
       // use if the form was empty so we can figure out which transactions are
       // just setting things to their default values for the current form.
       $defaults = array();
       foreach ($submit_fields as $key => $field) {
         $defaults[$key] = $field->getValueForTransaction();
       }
 
       foreach ($submit_fields as $key => $field) {
         $field->setIsSubmittedForm(true);
 
         if (!$field->shouldReadValueFromSubmit()) {
           continue;
         }
 
         $field->readValueFromSubmit($request);
       }
 
       $xactions = array();
 
       if ($this->getIsCreate()) {
         $xactions[] = id(clone $template)
           ->setTransactionType(PhabricatorTransactions::TYPE_CREATE);
       }
 
       foreach ($submit_fields as $key => $field) {
         $field_value = $field->getValueForTransaction();
 
         $type_xactions = $field->generateTransactions(
           clone $template,
           array(
             'value' => $field_value,
           ));
 
         foreach ($type_xactions as $type_xaction) {
           $default = $defaults[$key];
 
           if ($default === $field->getValueForTransaction()) {
             $type_xaction->setIsDefaultTransaction(true);
           }
 
           $xactions[] = $type_xaction;
         }
       }
 
       $editor = $object->getApplicationTransactionEditor()
         ->setActor($viewer)
         ->setContentSourceFromRequest($request)
         ->setContinueOnNoEffect(true);
 
       try {
         $xactions = $this->willApplyTransactions($object, $xactions);
 
         $editor->applyTransactions($object, $xactions);
 
         $this->didApplyTransactions($object, $xactions);
 
         return $this->newEditResponse($request, $object, $xactions);
       } catch (PhabricatorApplicationTransactionValidationException $ex) {
         $validation_exception = $ex;
 
         foreach ($fields as $field) {
           $message = $this->getValidationExceptionShortMessage($ex, $field);
           if ($message === null) {
             continue;
           }
 
           $field->setControlError($message);
         }
       }
     } else {
       if ($this->getIsCreate()) {
         $template = $request->getStr('template');
 
         if (strlen($template)) {
           $template_object = $this->newObjectFromIdentifier(
             $template,
             array(
               PhabricatorPolicyCapability::CAN_VIEW,
             ));
           if (!$template_object) {
             return new Aphront404Response();
           }
         } else {
           $template_object = null;
         }
 
         if ($template_object) {
           $copy_fields = $this->buildEditFields($template_object);
           $copy_fields = mpull($copy_fields, null, 'getKey');
           foreach ($copy_fields as $copy_key => $copy_field) {
             if (!$copy_field->getIsCopyable()) {
               unset($copy_fields[$copy_key]);
             }
           }
         } else {
           $copy_fields = array();
         }
 
         foreach ($fields as $field) {
           if (!$field->shouldReadValueFromRequest()) {
             continue;
           }
 
           $field_key = $field->getKey();
           if (isset($copy_fields[$field_key])) {
             $field->readValueFromField($copy_fields[$field_key]);
           }
 
           $field->readValueFromRequest($request);
         }
       }
     }
 
     $action_button = $this->buildEditFormActionButton($object);
 
     if ($this->getIsCreate()) {
       $header_text = $this->getFormHeaderText($object);
       $header_icon = 'fa-plus-square';
     } else {
       $header_text = $this->getObjectEditTitleText($object);
       $header_icon = 'fa-pencil';
     }
 
     $show_preview = !$request->isAjax();
 
     if ($show_preview) {
       $previews = array();
       foreach ($fields as $field) {
         $preview = $field->getPreviewPanel();
         if (!$preview) {
           continue;
         }
 
         $control_id = $field->getControlID();
 
         $preview
           ->setControlID($control_id)
           ->setPreviewURI('/transactions/remarkuppreview/');
 
         $previews[] = $preview;
       }
     } else {
       $previews = array();
     }
 
     $form = $this->buildEditForm($object, $fields);
 
     if ($request->isAjax()) {
       if ($this->getIsCreate()) {
         $cancel_uri = $this->getObjectCreateCancelURI($object);
         $submit_button = $this->getObjectCreateButtonText($object);
       } else {
         $cancel_uri = $this->getEffectiveObjectEditCancelURI($object);
         $submit_button = $this->getObjectEditButtonText($object);
       }
 
       return $this->getController()
         ->newDialog()
         ->setWidth(AphrontDialogView::WIDTH_FULL)
         ->setTitle($header_text)
         ->setValidationException($validation_exception)
         ->appendForm($form)
         ->addCancelButton($cancel_uri)
         ->addSubmitButton($submit_button);
     }
 
     $crumbs = $this->buildCrumbs($object, $final = true);
 
     if ($this->getHideHeader()) {
       $header = null;
       $crumbs->setBorder(false);
     } else {
       $header = id(new PHUIHeaderView())
         ->setHeader($header_text)
         ->setHeaderIcon($header_icon);
       $crumbs->setBorder(true);
     }
 
     if ($action_button) {
       $header->addActionLink($action_button);
     }
 
     $box = id(new PHUIObjectBoxView())
       ->setUser($viewer)
       ->setHeaderText($this->getObjectName())
       ->setValidationException($validation_exception)
       ->setBackground(PHUIObjectBoxView::BLUE_PROPERTY)
       ->appendChild($form);
 
     // This is fairly questionable, but in use by Settings.
     if ($request->getURIData('formSaved')) {
       $box->setFormSaved(true);
     }
 
     $content = array(
       $box,
       $previews,
     );
 
     $view = new PHUITwoColumnView();
 
     if ($header) {
       $view->setHeader($header);
     }
 
     $navigation = $this->getNavigation();
     if ($navigation) {
       $view
         ->setNavigation($navigation)
         ->setMainColumn($content);
     } else {
       $view->setFooter($content);
     }
 
     return $controller->newPage()
       ->setTitle($header_text)
       ->setCrumbs($crumbs)
       ->appendChild($view);
   }
 
   protected function newEditResponse(
     AphrontRequest $request,
     $object,
     array $xactions) {
     return id(new AphrontRedirectResponse())
       ->setURI($this->getEffectiveObjectEditDoneURI($object));
   }
 
   private function buildEditForm($object, array $fields) {
     $viewer = $this->getViewer();
     $controller = $this->getController();
     $request = $controller->getRequest();
 
     $fields = $this->willBuildEditForm($object, $fields);
 
     $form = id(new AphrontFormView())
       ->setUser($viewer)
       ->addHiddenInput('editEngine', 'true');
 
     foreach ($this->contextParameters as $param) {
       $form->addHiddenInput($param, $request->getStr($param));
     }
 
     foreach ($fields as $field) {
       $field->appendToForm($form);
     }
 
     if ($this->getIsCreate()) {
       $cancel_uri = $this->getObjectCreateCancelURI($object);
       $submit_button = $this->getObjectCreateButtonText($object);
     } else {
       $cancel_uri = $this->getEffectiveObjectEditCancelURI($object);
       $submit_button = $this->getObjectEditButtonText($object);
     }
 
     if (!$request->isAjax()) {
       $buttons = id(new AphrontFormSubmitControl())
         ->setValue($submit_button);
 
       if ($cancel_uri) {
         $buttons->addCancelButton($cancel_uri);
       }
 
       $form->appendControl($buttons);
     }
 
     return $form;
   }
 
   protected function willBuildEditForm($object, array $fields) {
     return $fields;
   }
 
   private function buildEditFormActionButton($object) {
     if (!$this->isEngineConfigurable()) {
       return null;
     }
 
     $viewer = $this->getViewer();
 
     $action_view = id(new PhabricatorActionListView())
       ->setUser($viewer);
 
     foreach ($this->buildEditFormActions($object) as $action) {
       $action_view->addAction($action);
     }
 
     $action_button = id(new PHUIButtonView())
       ->setTag('a')
       ->setText(pht('Configure Form'))
       ->setHref('#')
       ->setIcon('fa-gear')
       ->setDropdownMenu($action_view);
 
     return $action_button;
   }
 
   private function buildEditFormActions($object) {
     $actions = array();
 
     if ($this->supportsEditEngineConfiguration()) {
       $engine_key = $this->getEngineKey();
       $config = $this->getEditEngineConfiguration();
 
       $can_manage = PhabricatorPolicyFilter::hasCapability(
         $this->getViewer(),
         $config,
         PhabricatorPolicyCapability::CAN_EDIT);
 
       if ($can_manage) {
         $manage_uri = $config->getURI();
       } else {
         $manage_uri = $this->getEditURI(null, 'nomanage/');
       }
 
       $view_uri = "/transactions/editengine/{$engine_key}/";
 
       $actions[] = id(new PhabricatorActionView())
         ->setLabel(true)
         ->setName(pht('Configuration'));
 
       $actions[] = id(new PhabricatorActionView())
         ->setName(pht('View Form Configurations'))
         ->setIcon('fa-list-ul')
         ->setHref($view_uri);
 
       $actions[] = id(new PhabricatorActionView())
         ->setName(pht('Edit Form Configuration'))
         ->setIcon('fa-pencil')
         ->setHref($manage_uri)
         ->setDisabled(!$can_manage)
         ->setWorkflow(!$can_manage);
     }
 
     $actions[] = id(new PhabricatorActionView())
       ->setLabel(true)
       ->setName(pht('Documentation'));
 
     $actions[] = id(new PhabricatorActionView())
       ->setName(pht('Using HTTP Parameters'))
       ->setIcon('fa-book')
       ->setHref($this->getEditURI($object, 'parameters/'));
 
     $doc_href = PhabricatorEnv::getDoclink('User Guide: Customizing Forms');
     $actions[] = id(new PhabricatorActionView())
       ->setName(pht('User Guide: Customizing Forms'))
       ->setIcon('fa-book')
       ->setHref($doc_href);
 
     return $actions;
   }
 
 
   /**
    * Test if the viewer could apply a certain type of change by using the
    * normal "Edit" form.
    *
    * This method returns `true` if the user has access to an edit form and
    * that edit form has a field which applied the specified transaction type,
    * and that field is visible and editable for the user.
    *
    * For example, you can use it to test if a user is able to reassign tasks
    * or not, prior to rendering dedicated UI for task reassingment.
    *
    * Note that this method does NOT test if the user can actually edit the
    * current object, just if they have access to the related field.
    *
    * @param const Transaction type to test for.
    * @return bool True if the user could "Edit" to apply the transaction type.
    */
   final public function hasEditAccessToTransaction($xaction_type) {
     $viewer = $this->getViewer();
 
     $config = $this->loadDefaultEditConfiguration();
     if (!$config) {
       return false;
     }
 
     $object = $this->getTargetObject();
     if (!$object) {
       $object = $this->newEditableObject();
     }
 
     $fields = $this->buildEditFields($object);
 
     $field = null;
     foreach ($fields as $form_field) {
       $field_xaction_type = $form_field->getTransactionType();
       if ($field_xaction_type === $xaction_type) {
         $field = $form_field;
         break;
       }
     }
 
     if (!$field) {
       return false;
     }
 
     if (!$field->shouldReadValueFromSubmit()) {
       return false;
     }
 
     return true;
   }
 
 
   final public function addActionToCrumbs(
     PHUICrumbsView $crumbs,
     array $parameters = array()) {
     $viewer = $this->getViewer();
 
     $can_create = $this->hasCreateCapability();
     if ($can_create) {
       $configs = $this->loadUsableConfigurationsForCreate();
     } else {
       $configs = array();
     }
 
     $dropdown = null;
     $disabled = false;
     $workflow = false;
 
     $menu_icon = 'fa-plus-square';
 
     if (!$configs) {
       if ($viewer->isLoggedIn()) {
         $disabled = true;
       } else {
         // If the viewer isn't logged in, assume they'll get hit with a login
         // dialog and are likely able to create objects after they log in.
         $disabled = false;
       }
       $workflow = true;
 
       if ($can_create) {
         $create_uri = $this->getEditURI(null, 'nodefault/');
       } else {
         $create_uri = $this->getEditURI(null, 'nocreate/');
       }
     } else {
       $config = head($configs);
       $form_key = $config->getIdentifier();
       $create_uri = $this->getEditURI(null, "form/{$form_key}/");
 
       if ($parameters) {
         $create_uri = (string)id(new PhutilURI($create_uri))
           ->setQueryParams($parameters);
       }
 
       if (count($configs) > 1) {
         $menu_icon = 'fa-caret-square-o-down';
 
         $dropdown = id(new PhabricatorActionListView())
           ->setUser($viewer);
 
         foreach ($configs as $config) {
           $form_key = $config->getIdentifier();
           $config_uri = $this->getEditURI(null, "form/{$form_key}/");
 
           if ($parameters) {
             $config_uri = (string)id(new PhutilURI($config_uri))
               ->setQueryParams($parameters);
           }
 
           $item_icon = 'fa-plus';
 
           $dropdown->addAction(
             id(new PhabricatorActionView())
               ->setName($config->getDisplayName())
               ->setIcon($item_icon)
               ->setHref($config_uri));
         }
       }
     }
 
     $action = id(new PHUIListItemView())
       ->setName($this->getObjectCreateShortText())
       ->setHref($create_uri)
       ->setIcon($menu_icon)
       ->setWorkflow($workflow)
       ->setDisabled($disabled);
 
     if ($dropdown) {
       $action->setDropdownMenu($dropdown);
     }
 
     $crumbs->addAction($action);
   }
 
   final public function buildEditEngineCommentView($object) {
     $config = $this->loadDefaultEditConfiguration();
 
     if (!$config) {
       // TODO: This just nukes the entire comment form if you don't have access
       // to any edit forms. We might want to tailor this UX a bit.
       return id(new PhabricatorApplicationTransactionCommentView())
         ->setNoPermission(true);
     }
 
     $viewer = $this->getViewer();
     $object_phid = $object->getPHID();
 
     $is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');
 
     if ($is_serious) {
       $header_text = $this->getCommentViewSeriousHeaderText($object);
       $button_text = $this->getCommentViewSeriousButtonText($object);
     } else {
       $header_text = $this->getCommentViewHeaderText($object);
       $button_text = $this->getCommentViewButtonText($object);
     }
 
     $comment_uri = $this->getEditURI($object, 'comment/');
 
     $view = id(new PhabricatorApplicationTransactionCommentView())
       ->setUser($viewer)
       ->setObjectPHID($object_phid)
       ->setHeaderText($header_text)
       ->setAction($comment_uri)
       ->setSubmitButtonName($button_text);
 
     $draft = PhabricatorVersionedDraft::loadDraft(
       $object_phid,
       $viewer->getPHID());
     if ($draft) {
       $view->setVersionedDraft($draft);
     }
 
     $view->setCurrentVersion($this->loadDraftVersion($object));
 
     $fields = $this->buildEditFields($object);
 
     $comment_actions = array();
     foreach ($fields as $field) {
       if (!$field->shouldGenerateTransactionsFromComment()) {
         continue;
       }
 
       $comment_action = $field->getCommentAction();
       if (!$comment_action) {
         continue;
       }
 
       $key = $comment_action->getKey();
 
       // TODO: Validate these better.
 
       $comment_actions[$key] = $comment_action;
     }
 
     $comment_actions = msortv($comment_actions, 'getSortVector');
 
     $view->setCommentActions($comment_actions);
 
     return $view;
   }
 
   protected function loadDraftVersion($object) {
     $viewer = $this->getViewer();
 
     if (!$viewer->isLoggedIn()) {
       return null;
     }
 
     $template = $object->getApplicationTransactionTemplate();
     $conn_r = $template->establishConnection('r');
 
     // Find the most recent transaction the user has written. We'll use this
     // as a version number to make sure that out-of-date drafts get discarded.
     $result = queryfx_one(
       $conn_r,
       'SELECT id AS version FROM %T
         WHERE objectPHID = %s AND authorPHID = %s
         ORDER BY id DESC LIMIT 1',
       $template->getTableName(),
       $object->getPHID(),
       $viewer->getPHID());
 
     if ($result) {
       return (int)$result['version'];
     } else {
       return null;
     }
   }
 
 
 /* -(  Responding to HTTP Parameter Requests  )------------------------------ */
 
 
   /**
    * Respond to a request for documentation on HTTP parameters.
    *
    * @param object Editable object.
    * @return AphrontResponse Response object.
    * @task http
    */
   private function buildParametersResponse($object) {
     $controller = $this->getController();
     $viewer = $this->getViewer();
     $request = $controller->getRequest();
     $fields = $this->buildEditFields($object);
 
     $crumbs = $this->buildCrumbs($object);
     $crumbs->addTextCrumb(pht('HTTP Parameters'));
     $crumbs->setBorder(true);
 
     $header_text = pht(
       'HTTP Parameters: %s',
       $this->getObjectCreateShortText());
 
     $header = id(new PHUIHeaderView())
       ->setHeader($header_text);
 
     $help_view = id(new PhabricatorApplicationEditHTTPParameterHelpView())
       ->setUser($viewer)
       ->setFields($fields);
 
     $document = id(new PHUIDocumentViewPro())
       ->setUser($viewer)
       ->setHeader($header)
       ->appendChild($help_view);
 
     return $controller->newPage()
       ->setTitle(pht('HTTP Parameters'))
       ->setCrumbs($crumbs)
       ->appendChild($document);
   }
 
 
   private function buildError($object, $title, $body) {
     $cancel_uri = $this->getObjectCreateCancelURI($object);
 
     return $this->getController()
       ->newDialog()
       ->setTitle($title)
       ->appendParagraph($body)
       ->addCancelButton($cancel_uri);
   }
 
 
   private function buildNoDefaultResponse($object) {
     return $this->buildError(
       $object,
       pht('No Default Create Forms'),
       pht(
         'This application is not configured with any forms for creating '.
         'objects that are visible to you and enabled.'));
   }
 
   private function buildNoCreateResponse($object) {
     return $this->buildError(
       $object,
       pht('No Create Permission'),
       pht('You do not have permission to create these objects.'));
   }
 
   private function buildNoManageResponse($object) {
     return $this->buildError(
       $object,
       pht('No Manage Permission'),
       pht(
         'You do not have permission to configure forms for this '.
         'application.'));
   }
 
   private function buildNoEditResponse($object) {
     return $this->buildError(
       $object,
       pht('No Edit Forms'),
       pht(
         'You do not have access to any forms which are enabled and marked '.
         'as edit forms.'));
   }
 
   private function buildNotEditFormRespose($object, $config) {
     return $this->buildError(
       $object,
       pht('Not an Edit Form'),
       pht(
         'This form ("%s") is not marked as an edit form, so '.
         'it can not be used to edit objects.',
         $config->getName()));
   }
 
   private function buildDisabledFormResponse($object, $config) {
     return $this->buildError(
       $object,
       pht('Form Disabled'),
       pht(
         'This form ("%s") has been disabled, so it can not be used.',
         $config->getName()));
   }
 
   private function buildCommentResponse($object) {
     $viewer = $this->getViewer();
 
     if ($this->getIsCreate()) {
       return new Aphront404Response();
     }
 
     $controller = $this->getController();
     $request = $controller->getRequest();
 
     if (!$request->isFormPost()) {
       return new Aphront400Response();
     }
 
     $config = $this->loadDefaultEditConfiguration();
     if (!$config) {
       return new Aphront404Response();
     }
 
     $fields = $this->buildEditFields($object);
 
     $is_preview = $request->isPreviewRequest();
     $view_uri = $this->getEffectiveObjectViewURI($object);
 
     $template = $object->getApplicationTransactionTemplate();
     $comment_template = $template->getApplicationTransactionCommentObject();
 
     $comment_text = $request->getStr('comment');
 
     $actions = $request->getStr('editengine.actions');
     if ($actions) {
       $actions = phutil_json_decode($actions);
     }
 
     if ($is_preview) {
       $version_key = PhabricatorVersionedDraft::KEY_VERSION;
       $request_version = $request->getInt($version_key);
       $current_version = $this->loadDraftVersion($object);
       if ($request_version >= $current_version) {
         $draft = PhabricatorVersionedDraft::loadOrCreateDraft(
           $object->getPHID(),
           $viewer->getPHID(),
           $current_version);
 
         $draft
           ->setProperty('comment', $comment_text)
           ->setProperty('actions', $actions)
           ->save();
       }
     }
 
     $xactions = array();
 
     if ($actions) {
       $action_map = array();
       foreach ($actions as $action) {
         $type = idx($action, 'type');
         if (!$type) {
           continue;
         }
 
         if (empty($fields[$type])) {
           continue;
         }
 
         $action_map[$type] = $action;
       }
 
       foreach ($action_map as $type => $action) {
         $field = $fields[$type];
 
         if (!$field->shouldGenerateTransactionsFromComment()) {
           continue;
         }
 
         if (array_key_exists('initialValue', $action)) {
           $field->setInitialValue($action['initialValue']);
         }
 
         $field->readValueFromComment(idx($action, 'value'));
 
         $type_xactions = $field->generateTransactions(
           clone $template,
           array(
             'value' => $field->getValueForTransaction(),
           ));
         foreach ($type_xactions as $type_xaction) {
           $xactions[] = $type_xaction;
         }
       }
     }
 
     if (strlen($comment_text) || !$xactions) {
       $xactions[] = id(clone $template)
         ->setTransactionType(PhabricatorTransactions::TYPE_COMMENT)
         ->attachComment(
           id(clone $comment_template)
             ->setContent($comment_text));
     }
 
     $editor = $object->getApplicationTransactionEditor()
       ->setActor($viewer)
       ->setContinueOnNoEffect($request->isContinueRequest())
       ->setContinueOnMissingFields(true)
       ->setContentSourceFromRequest($request)
       ->setIsPreview($is_preview);
 
     try {
       $xactions = $editor->applyTransactions($object, $xactions);
     } catch (PhabricatorApplicationTransactionNoEffectException $ex) {
       return id(new PhabricatorApplicationTransactionNoEffectResponse())
         ->setCancelURI($view_uri)
         ->setException($ex);
     }
 
     if (!$is_preview) {
       PhabricatorVersionedDraft::purgeDrafts(
         $object->getPHID(),
         $viewer->getPHID(),
         $this->loadDraftVersion($object));
     }
 
     if ($request->isAjax() && $is_preview) {
       return id(new PhabricatorApplicationTransactionResponse())
         ->setViewer($viewer)
         ->setTransactions($xactions)
         ->setIsPreview($is_preview);
     } else {
       return id(new AphrontRedirectResponse())
         ->setURI($view_uri);
     }
   }
 
 
 /* -(  Conduit  )------------------------------------------------------------ */
 
 
   /**
    * Respond to a Conduit edit request.
    *
    * This method accepts a list of transactions to apply to an object, and
    * either edits an existing object or creates a new one.
    *
    * @task conduit
    */
   final public function buildConduitResponse(ConduitAPIRequest $request) {
     $viewer = $this->getViewer();
 
     $config = $this->loadDefaultConfiguration();
     if (!$config) {
       throw new Exception(
         pht(
           'Unable to load configuration for this EditEngine ("%s").',
           get_class($this)));
     }
 
     $identifier = $request->getValue('objectIdentifier');
     if ($identifier) {
       $this->setIsCreate(false);
       $object = $this->newObjectFromIdentifier($identifier);
     } else {
       $this->requireCreateCapability();
 
       $this->setIsCreate(true);
       $object = $this->newEditableObject();
     }
 
     $this->validateObject($object);
 
     $fields = $this->buildEditFields($object);
 
     $types = $this->getConduitEditTypesFromFields($fields);
     $template = $object->getApplicationTransactionTemplate();
 
     $xactions = $this->getConduitTransactions($request, $types, $template);
 
     $editor = $object->getApplicationTransactionEditor()
       ->setActor($viewer)
       ->setContentSource($request->newContentSource())
       ->setContinueOnNoEffect(true);
 
     if (!$this->getIsCreate()) {
       $editor->setContinueOnMissingFields(true);
     }
 
     $xactions = $editor->applyTransactions($object, $xactions);
 
     $xactions_struct = array();
     foreach ($xactions as $xaction) {
       $xactions_struct[] = array(
         'phid' => $xaction->getPHID(),
       );
     }
 
     return array(
       'object' => array(
         'id' => $object->getID(),
         'phid' => $object->getPHID(),
       ),
       'transactions' => $xactions_struct,
     );
   }
 
 
   /**
    * Generate transactions which can be applied from edit actions in a Conduit
    * request.
    *
    * @param ConduitAPIRequest The request.
    * @param list<PhabricatorEditType> Supported edit types.
    * @param PhabricatorApplicationTransaction Template transaction.
    * @return list<PhabricatorApplicationTransaction> Generated transactions.
    * @task conduit
    */
   private function getConduitTransactions(
     ConduitAPIRequest $request,
     array $types,
     PhabricatorApplicationTransaction $template) {
 
     $viewer = $request->getUser();
     $transactions_key = 'transactions';
 
     $xactions = $request->getValue($transactions_key);
     if (!is_array($xactions)) {
       throw new Exception(
         pht(
           'Parameter "%s" is not a list of transactions.',
           $transactions_key));
     }
 
     foreach ($xactions as $key => $xaction) {
       if (!is_array($xaction)) {
         throw new Exception(
           pht(
             'Parameter "%s" must contain a list of transaction descriptions, '.
             'but item with key "%s" is not a dictionary.',
             $transactions_key,
             $key));
       }
 
       if (!array_key_exists('type', $xaction)) {
         throw new Exception(
           pht(
             'Parameter "%s" must contain a list of transaction descriptions, '.
             'but item with key "%s" is missing a "type" field. Each '.
             'transaction must have a type field.',
             $transactions_key,
             $key));
       }
 
       $type = $xaction['type'];
       if (empty($types[$type])) {
         throw new Exception(
           pht(
             'Transaction with key "%s" has invalid type "%s". This type is '.
             'not recognized. Valid types are: %s.',
             $key,
             $type,
             implode(', ', array_keys($types))));
       }
     }
 
     $results = array();
 
     if ($this->getIsCreate()) {
       $results[] = id(clone $template)
         ->setTransactionType(PhabricatorTransactions::TYPE_CREATE);
     }
 
     foreach ($xactions as $xaction) {
       $type = $types[$xaction['type']];
 
       // Let the parameter type interpret the value. This allows you to
       // use usernames in list<user> fields, for example.
       $parameter_type = $type->getConduitParameterType();
 
       $parameter_type->setViewer($viewer);
 
       try {
         $xaction['value'] = $parameter_type->getValue(
           $xaction,
           'value',
           $request->getIsStrictlyTyped());
       } catch (Exception $ex) {
         throw new PhutilProxyException(
           pht(
             'Exception when processing transaction of type "%s": %s',
             $xaction['type'],
             $ex->getMessage()),
           $ex);
       }
 
       $type_xactions = $type->generateTransactions(
         clone $template,
         $xaction);
 
       foreach ($type_xactions as $type_xaction) {
         $results[] = $type_xaction;
       }
     }
 
     return $results;
   }
 
 
   /**
    * @return map<string, PhabricatorEditType>
    * @task conduit
    */
   private function getConduitEditTypesFromFields(array $fields) {
     $types = array();
     foreach ($fields as $field) {
       $field_types = $field->getConduitEditTypes();
 
       if ($field_types === null) {
         continue;
       }
 
       foreach ($field_types as $field_type) {
         $field_type->setField($field);
         $types[$field_type->getEditType()] = $field_type;
       }
     }
     return $types;
   }
 
   public function getConduitEditTypes() {
     $config = $this->loadDefaultConfiguration();
     if (!$config) {
       return array();
     }
 
     $object = $this->newEditableObject();
     $fields = $this->buildEditFields($object);
     return $this->getConduitEditTypesFromFields($fields);
   }
 
   final public static function getAllEditEngines() {
     return id(new PhutilClassMapQuery())
       ->setAncestorClass(__CLASS__)
       ->setUniqueMethod('getEngineKey')
       ->execute();
   }
 
   final public static function getByKey(PhabricatorUser $viewer, $key) {
     return id(new PhabricatorEditEngineQuery())
       ->setViewer($viewer)
       ->withEngineKeys(array($key))
       ->executeOne();
   }
 
   public function getIcon() {
     $application = $this->getApplication();
     return $application->getIcon();
   }
 
   public function hasQuickCreateActions() {
     if (!$this->isEngineConfigurable()) {
       return false;
     }
 
     return true;
   }
 
   public function newQuickCreateActions(array $configs) {
     $items = array();
 
     if (!$configs) {
       return array();
     }
 
     // If the viewer is logged in and can't create objects, don't show the
     // menu item. If they're logged out, we assume they could create objects
     // if they logged in, so we show the item as a hint about how to
     // accomplish the action.
     if ($this->getViewer()->isLoggedIn()) {
       if (!$this->hasCreateCapability()) {
         return array();
       }
     }
 
     if (count($configs) == 1) {
       $config = head($configs);
       $items[] = $this->newQuickCreateAction($config);
     } else {
       $group_name = $this->getQuickCreateMenuHeaderText();
 
       $items[] = id(new PHUIListItemView())
         ->setType(PHUIListItemView::TYPE_LABEL)
         ->setName($group_name);
 
       foreach ($configs as $config) {
         $items[] = $this->newQuickCreateAction($config)
           ->setIndented(true);
       }
     }
 
     return $items;
   }
 
   private function loadUsableConfigurationsForCreate() {
     $viewer = $this->getViewer();
 
     $configs = id(new PhabricatorEditEngineConfigurationQuery())
       ->setViewer($viewer)
       ->withEngineKeys(array($this->getEngineKey()))
       ->withIsDefault(true)
       ->withIsDisabled(false)
       ->execute();
 
     $configs = msort($configs, 'getCreateSortKey');
 
     return $configs;
   }
 
   private function newQuickCreateAction(
     PhabricatorEditEngineConfiguration $config) {
 
     $item_name = $config->getName();
     $item_icon = $config->getIcon();
     $form_key = $config->getIdentifier();
     $item_uri = $this->getEditURI(null, "form/{$form_key}/");
 
     return id(new PHUIListItemView())
       ->setName($item_name)
       ->setIcon($item_icon)
       ->setHref($item_uri);
   }
 
   protected function getValidationExceptionShortMessage(
     PhabricatorApplicationTransactionValidationException $ex,
     PhabricatorEditField $field) {
 
     $xaction_type = $field->getTransactionType();
     if ($xaction_type === null) {
       return null;
     }
 
     return $ex->getShortMessage($xaction_type);
   }
 
   protected function getCreateNewObjectPolicy() {
     return PhabricatorPolicies::POLICY_USER;
   }
 
   private function requireCreateCapability() {
     PhabricatorPolicyFilter::requireCapability(
       $this->getViewer(),
       $this,
       PhabricatorPolicyCapability::CAN_EDIT);
   }
 
   private function hasCreateCapability() {
     return PhabricatorPolicyFilter::hasCapability(
       $this->getViewer(),
       $this,
       PhabricatorPolicyCapability::CAN_EDIT);
   }
 
+  public function isCommentAction() {
+    return ($this->getEditAction() == 'comment');
+  }
+
+  public function getEditAction() {
+    $controller = $this->getController();
+    $request = $controller->getRequest();
+    return $request->getURIData('editAction');
+  }
+
+
 /* -(  Form Pages  )--------------------------------------------------------- */
 
 
   public function getSelectedPage() {
     return $this->page;
   }
 
 
   private function selectPage($object, $page_key) {
     $pages = $this->getPages($object);
 
     if (empty($pages[$page_key])) {
       return null;
     }
 
     $this->page = $pages[$page_key];
     return $this->page;
   }
 
 
   protected function newPages($object) {
     return array();
   }
 
 
   protected function getPages($object) {
     if ($this->pages === null) {
       $pages = $this->newPages($object);
 
       assert_instances_of($pages, 'PhabricatorEditPage');
       $pages = mpull($pages, null, 'getKey');
 
       $this->pages = $pages;
     }
 
     return $this->pages;
   }
 
   private function applyPageToFields($object, array $fields) {
     $pages = $this->getPages($object);
     if (!$pages) {
       return $fields;
     }
 
     if (!$this->getSelectedPage()) {
       return $fields;
     }
 
     $page_picks = array();
     $default_key = head($pages)->getKey();
     foreach ($pages as $page_key => $page) {
       foreach ($page->getFieldKeys() as $field_key) {
         $page_picks[$field_key] = $page_key;
       }
       if ($page->getIsDefault()) {
         $default_key = $page_key;
       }
     }
 
     $page_map = array_fill_keys(array_keys($pages), array());
     foreach ($fields as $field_key => $field) {
       if (isset($page_picks[$field_key])) {
         $page_map[$page_picks[$field_key]][$field_key] = $field;
         continue;
       }
 
       // TODO: Maybe let the field pick a page to associate itself with so
       // extensions can force themselves onto a particular page?
 
       $page_map[$default_key][$field_key] = $field;
     }
 
     $page = $this->getSelectedPage();
     if (!$page) {
       $page = head($pages);
     }
 
     $selected_key = $page->getKey();
     return $page_map[$selected_key];
   }
 
   protected function willApplyTransactions($object, array $xactions) {
     return $xactions;
   }
 
   protected function didApplyTransactions($object, array $xactions) {
     return;
   }
 
 
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */
 
 
   public function getPHID() {
     return get_class($this);
   }
 
   public function getCapabilities() {
     return array(
       PhabricatorPolicyCapability::CAN_VIEW,
       PhabricatorPolicyCapability::CAN_EDIT,
     );
   }
 
   public function getPolicy($capability) {
     switch ($capability) {
       case PhabricatorPolicyCapability::CAN_VIEW:
         return PhabricatorPolicies::getMostOpenPolicy();
       case PhabricatorPolicyCapability::CAN_EDIT:
         return $this->getCreateNewObjectPolicy();
     }
   }
 
   public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
     return false;
   }
 
   public function describeAutomaticCapability($capability) {
     return null;
   }
 }