Make reloading workboards with "R" respect workboard ordering

Summary:
Depends on D20653. Ref T4900. Pass ordering details to the reload endpoint so it can give the client accurate ordering/header information in the response.

The removed comment mentions this, but here's why this is a difficult mess:

- In window A, view a board with "Group by: Owner" and no tasks owned by "Alice". Since "Alice" owns no tasks, this means the columns do not have an "Assigned to: Alice" header!
- In window B, edit task T and assign it to Alice.
- In window A, press "R".

Window A now not only needs to update to properly reflect the state of task T, it actually needs to draw a new "Assigned to: Alice" header in every column.

Fortunately, the "group by" code anticipates this being a big mess, is fairly careful about handling it, and the client can handle this state change and the actual code change here isn't too involved. This is just causing a lot of not-very-obvious indirect effects in the pipeline to handle these situations that need complex redraws.

Test Plan:
- After making various normal edits/creates/moves in window A, pressed "R" in window B. Saw ordering reflected correctly after sync.
- Went through the whole "Group by: Owner" + assign to unrepresented owner flow above. After pressing "R", saw "Assigned to: Alice" appear on the board.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T4900

Differential Revision: https://secure.phabricator.com/D20654

resources/celerity/map.php

···
     'rsrc/js/application/phortune/phortune-credit-card-form.js' => 'd12d214f',
     'rsrc/js/application/policy/behavior-policy-control.js' => '0eaa33a9',
     'rsrc/js/application/policy/behavior-policy-rule-editor.js' => '9347f172',
-    'rsrc/js/application/projects/WorkboardBoard.js' => '50147a89',
+    'rsrc/js/application/projects/WorkboardBoard.js' => '19df903f',
     'rsrc/js/application/projects/WorkboardCard.js' => '0392a5d8',
     'rsrc/js/application/projects/WorkboardCardTemplate.js' => '84f82dad',
     'rsrc/js/application/projects/WorkboardColumn.js' => 'c3d24e63',
···
     'javelin-view-renderer' => '9aae2b66',
     'javelin-view-visitor' => '308f9fe4',
     'javelin-websocket' => 'fdc13e4e',
-    'javelin-workboard-board' => '50147a89',
+    'javelin-workboard-board' => '19df903f',
     'javelin-workboard-card' => '0392a5d8',
     'javelin-workboard-card-template' => '84f82dad',
     'javelin-workboard-column' => 'c3d24e63',
···
     '17b71bbc' => array(
       'phui-theme-css',
     ),
+    '19df903f' => array(
+      'javelin-install',
+      'javelin-dom',
+      'javelin-util',
+      'javelin-stratcom',
+      'javelin-workflow',
+      'phabricator-draggable-list',
+      'javelin-workboard-column',
+      'javelin-workboard-header-template',
+      'javelin-workboard-card-template',
+      'javelin-workboard-order-template',
+    ),
     '1b6acc2a' => array(
       'javelin-magical-init',
       'javelin-util',
···
     ),
     '4feea7d3' => array(
       'trigger-rule-control',
-    ),
-    '50147a89' => array(
-      'javelin-install',
-      'javelin-dom',
-      'javelin-util',
-      'javelin-stratcom',
-      'javelin-workflow',
-      'phabricator-draggable-list',
-      'javelin-workboard-column',
-      'javelin-workboard-header-template',
-      'javelin-workboard-card-template',
-      'javelin-workboard-order-template',
     ),
     '506aa3f4' => array(
       'javelin-behavior',

src/applications/project/controller/PhabricatorProjectBoardReloadController.php

···
       return $response;
     }
 
+    $order = $request->getStr('order');
+    if (!strlen($order)) {
+      $order = PhabricatorProjectColumnNaturalOrder::ORDERKEY;
+    }
+
+    $ordering = PhabricatorProjectColumnOrder::getOrderByKey($order);
+    $ordering = id(clone $ordering)
+      ->setViewer($viewer);
+
     $project = $this->getProject();
     $state = $this->getViewState();
     $board_uri = $state->newWorkboardURI();
···
     $engine = id(new PhabricatorBoardResponseEngine())
       ->setViewer($viewer)
       ->setBoardPHID($board_phid)
+      ->setOrdering($ordering)
       ->setObjects($objects)
       ->setUpdatePHIDs($update_phids)
       ->setVisiblePHIDs($visible_phids);
-
-    // TODO: We don't currently process "order" properly. If a user is viewing
-    // a board grouped by "Owner", and another user changes a task to be owned
-    // by a user who currently owns nothing on the board, the new header won't
-    // generate correctly if the first user presses "R".
 
     return $engine->buildResponse();
   }

webroot/rsrc/js/application/projects/WorkboardBoard.js

···
 
       var data = {
         state: JX.JSON.stringify(state),
+        order: this.getOrder()
       };
 
       var on_reload = JX.bind(this, this._onReloadResponse);