Roughly implement milestone columns on workboards

Summary:
Ref T10010. These aren't perfect but I think (?) they aren't horribly broken.

  - When a project is a parent project, destroy (as far as the user can tell) any custom columns.
  - When a project has milestones, automatically generate columns on the project's workboard (if it has a workboard).
  - When you move tasks between milestones, add the proper milestone tag.
  - When you move tasks out of milestones back into the backlog, add the proper parent project tag.
  - (Plenty of UI / design stuff to adjust.)

Test Plan:
  - Dragged stuff between milestone columns.
  - Used a normal workboard.
  - Wasn't able to find any egregiously bad cases that did anything terrible.

{F1088224}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10010

Differential Revision: https://secure.phabricator.com/D15171

src/applications/project/controller/PhabricatorProjectMoveController.php

@@ -139,7 +139,33 @@ final class PhabricatorProjectMoveController
           ->setTransactionType(ManiphestTransaction::TYPE_SUBPRIORITY)
           ->setNewValue($sub);
       }
-   }
+    }
+
+    $proxy = $column->getProxy();
+    if ($proxy) {
+      // We're moving the task into a subproject or milestone column, so add
+      // the subproject or milestone.
+      $add_projects = array($proxy->getPHID());
+    } else if ($project->getHasSubprojects() || $project->getHasMilestones()) {
+      // We're moving the task into the "Backlog" column on the parent project,
+      // so add the parent explicitly. This gets rid of any subproject or
+      // milestone tags.
+      $add_projects = array($project->getPHID());
+    } else {
+      $add_projects = array();
+    }
+
+    if ($add_projects) {
+      $project_type = PhabricatorProjectObjectHasProjectEdgeType::EDGECONST;
+
+      $xactions[] = id(new ManiphestTransaction())
+        ->setTransactionType(PhabricatorTransactions::TYPE_EDGE)
+        ->setMetadataValue('edge:type', $project_type)
+        ->setNewValue(
+          array(
+            '+' => array_fuse($add_projects),
+          ));
+    }
 
     $editor = id(new ManiphestTransactionEditor())
       ->setActor($viewer)
@@ -157,6 +183,18 @@ final class PhabricatorProjectMoveController
         ->executeOne();
     }
 
+    // Reload the object so it reflects edits which have been applied.
+    $object = id(new ManiphestTaskQuery())
+      ->setViewer($viewer)
+      ->withPHIDs(array($object_phid))
+      ->needProjectPHIDs(true)
+      ->requireCapabilities(
+        array(
+          PhabricatorPolicyCapability::CAN_VIEW,
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+      ->executeOne();
+
     $card = id(new ProjectBoardTaskCard())
       ->setViewer($viewer)
       ->setTask($object)
@@ -169,6 +207,6 @@ final class PhabricatorProjectMoveController
 
     return id(new AphrontAjaxResponse())->setContent(
       array('task' => $card));
- }
+  }
 
 }