Clean up "HTTP Parameters" view a bit for EditEngine forms

Summary: Ref T10004. This lost a couple of fields when I rearranged how descriptions work. Restore them.

Test Plan:
  - Viewed "Using HTTP Parameters".
  - Everything had nice descriptions.
  - No more weird phantom/misleading 'comment' transaction in UI.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10004

Differential Revision: https://secure.phabricator.com/D14822

src/applications/policy/editor/PhabricatorPolicyEditEngineExtension.php

@@ -45,6 +45,7 @@ final class PhabricatorPolicyEditEngineExtension
         'capability' => PhabricatorPolicyCapability::CAN_VIEW,
         'label' => pht('View Policy'),
         'description' => pht('Controls who can view the object.'),
+        'description.conduit' => pht('Change the view policy of the object.'),
         'edit' => 'view',
       ),
       PhabricatorTransactions::TYPE_EDIT_POLICY => array(
@@ -53,6 +54,7 @@ final class PhabricatorPolicyEditEngineExtension
         'capability' => PhabricatorPolicyCapability::CAN_EDIT,
         'label' => pht('Edit Policy'),
         'description' => pht('Controls who can edit the object.'),
+        'description.conduit' => pht('Change the edit policy of the object.'),
         'edit' => 'edit',
       ),
       PhabricatorTransactions::TYPE_JOIN_POLICY => array(
@@ -61,6 +63,7 @@ final class PhabricatorPolicyEditEngineExtension
         'capability' => PhabricatorPolicyCapability::CAN_JOIN,
         'label' => pht('Join Policy'),
         'description' => pht('Controls who can join the object.'),
+        'description.conduit' => pht('Change the join policy of the object.'),
         'edit' => 'join',
       ),
     );
@@ -76,6 +79,7 @@ final class PhabricatorPolicyEditEngineExtension
       $aliases = $spec['aliases'];
       $label = $spec['label'];
       $description = $spec['description'];
+      $conduit_description = $spec['description.conduit'];
       $edit = $spec['edit'];
 
       $policy_field = id(new PhabricatorPolicyEditField())
@@ -87,7 +91,8 @@ final class PhabricatorPolicyEditEngineExtension
         ->setPolicies($policies)
         ->setTransactionType($type)
         ->setEditTypeKey($edit)
-        ->setConduitDescription($description)
+        ->setDescription($description)
+        ->setConduitDescription($conduit_description)
         ->setConduitTypeDescription(pht('New policy PHID or constant.'))
         ->setValue($object->getPolicy($capability));
       $fields[] = $policy_field;

src/applications/subscriptions/engineextension/PhabricatorSubscriptionsEditEngineExtension.php

@@ -45,6 +45,7 @@ final class PhabricatorSubscriptionsEditEngineExtension
       ->setIsCopyable(true)
       ->setUseEdgeTransactions(true)
       ->setCommentActionLabel(pht('Change Subscribers'))
+      ->setDescription(pht('Choose subscribers.'))
       ->setTransactionType($subscribers_type)
       ->setValue($sub_phids);
 

src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php

@@ -840,8 +840,18 @@ abstract class PhabricatorApplicationTransactionEditor
       throw $ex;
     }
 
+    // TODO: Once everything is on EditEngine, just use getIsNewObject() to
+    // figure this out instead.
+    $mark_as_create = false;
+    $create_type = PhabricatorTransactions::TYPE_CREATE;
     foreach ($xactions as $xaction) {
-      if ($this->getIsNewObject()) {
+      if ($xaction->getTransactionType() == $create_type) {
+        $mark_as_create = true;
+      }
+    }
+
+    if ($mark_as_create) {
+      foreach ($xactions as $xaction) {
         $xaction->setIsCreateTransaction(true);
       }
     }

src/applications/transactions/view/PhabricatorApplicationEditHTTPParameterHelpView.php

@@ -39,11 +39,17 @@ final class PhabricatorApplicationEditHTTPParameterHelpView
     // Remove fields which do not expose an HTTP parameter type.
     $types = array();
     foreach ($fields as $key => $field) {
+      if (!$field->shouldGenerateTransactionsFromSubmit()) {
+        unset($fields[$key]);
+        continue;
+      }
+
       $type = $field->getHTTPParameterType();
       if ($type === null) {
         unset($fields[$key]);
         continue;
       }
+
       $types[$type->getTypeName()] = $type;
     }