Don't downgrade accepts on update (fix "sticky accept")

Summary:
Fixes T12496. Sticky accept was accidentally impacted by the "void" changes in D17566.

Instead, don't always downgrade all accepts/rejects: on update, we only want to downgrade accepts.

Test Plan:
  - With sticky accept off, updated an accepted revision: new state is "needs review".
  - With sticky accept on, updated an accepted revision: new state is "accepted" (sticky accept working correctly).
  - Did "reject" + "request review" to make sure that still works, worked fine.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12496

Differential Revision: https://secure.phabricator.com/D17605

src/applications/differential/editor/DifferentialTransactionEditor.php

@@ -339,12 +339,22 @@ final class DifferentialTransactionEditor
       }
     }
 
-    if ($downgrade_accepts || $downgrade_rejects) {
+    $downgrade = array();
+    if ($downgrade_accepts) {
+      $downgrade[] = DifferentialReviewerStatus::STATUS_ACCEPTED;
+    }
+
+    if ($downgrade_accepts) {
+      $downgrade[] = DifferentialReviewerStatus::STATUS_REJECTED;
+    }
+
+    if ($downgrade) {
       $void_type = DifferentialRevisionVoidTransaction::TRANSACTIONTYPE;
+
       $results[] = id(new DifferentialTransaction())
         ->setTransactionType($void_type)
         ->setIgnoreOnNoEffect(true)
-        ->setNewValue(true);
+        ->setNewValue($downgrade);
     }
 
     $is_commandeer = false;

src/applications/differential/xaction/DifferentialRevisionVoidTransaction.php

@@ -28,7 +28,7 @@ final class DifferentialRevisionVoidTransaction
           AND reviewerStatus IN (%Ls)',
       $table_name,
       $object->getPHID(),
-      $this->getVoidableStatuses());
+      $value);
 
     return ipull($rows, 'reviewerPHID');
   }
@@ -47,11 +47,11 @@ final class DifferentialRevisionVoidTransaction
       'UPDATE %T SET voidedPHID = %s
         WHERE revisionPHID = %s
           AND voidedPHID IS NULL
-          AND reviewerStatus IN (%Ls)',
+          AND reviewerPHID IN (%Ls)',
       $table_name,
       $this->getActingAsPHID(),
       $object->getPHID(),
-      $this->getVoidableStatuses());
+      $value);
   }
 
   public function shouldHide() {