Fix some issues where Conpherence would make to many draft requests

Summary:
A few minor fixes:

  - When we build a tag with `"meta" => null`, strip the attribute like we do for all other attributes. Previously, we would actually set the metadata to `null`. This happened with the Conpherence form.
  - Just respond to the draft request with an empty (but valid) response, instead of building a dialog.
  - `PhabricatorShapedRequest` is confusingly named and I should have caught this in review, but the basic shape of it is:
    - You make one object.
    - You call `trigger()` when stuff changes (e.g., a keystroke).
    - It manages making a small number of requests (e.g., one request after the user stops typing for a moment).
  - The way it was being used previously would incorrectly send a request for every keystroke.

I think I'm going to simplify `ShapedRequest` and merge it into some larger queue for T430.

Test Plan: Typed some text, no longer saw a flurry of requests. Reloaded page, still saw draft text.

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran, chad

Differential Revision: https://secure.phabricator.com/D8380

resources/celerity/map.php

@@ -348,7 +348,7 @@ return array(
     'rsrc/js/application/aphlict/behavior-aphlict-listen.js' => '845731b8',
     'rsrc/js/application/auth/behavior-persona-login.js' => '9414ff18',
     'rsrc/js/application/config/behavior-reorder-fields.js' => '938aed89',
-    'rsrc/js/application/conpherence/behavior-menu.js' => '7ff0b011',
+    'rsrc/js/application/conpherence/behavior-menu.js' => '7ee23816',
     'rsrc/js/application/conpherence/behavior-pontificate.js' => '53f6f2dd',
     'rsrc/js/application/conpherence/behavior-widget-pane.js' => 'd8ef8659',
     'rsrc/js/application/countdown/timer.js' => '889c96f3',
@@ -535,7 +535,7 @@ return array(
     'javelin-behavior-audit-preview' => 'be81801d',
     'javelin-behavior-balanced-payment-form' => '3b3e1664',
     'javelin-behavior-config-reorder-fields' => '938aed89',
-    'javelin-behavior-conpherence-menu' => '7ff0b011',
+    'javelin-behavior-conpherence-menu' => '7ee23816',
     'javelin-behavior-conpherence-pontificate' => '53f6f2dd',
     'javelin-behavior-conpherence-widget-pane' => 'd8ef8659',
     'javelin-behavior-countdown-timer' => '889c96f3',
@@ -1225,6 +1225,13 @@ return array(
       2 => 'javelin-util',
       3 => 'phabricator-shaped-request',
     ),
+    '62e18640' =>
+    array(
+      0 => 'javelin-install',
+      1 => 'javelin-util',
+      2 => 'javelin-dom',
+      3 => 'javelin-typeahead-normalizer',
+    ),
     '6453c869' =>
     array(
       0 => 'javelin-install',
@@ -1258,13 +1265,6 @@ return array(
       0 => 'javelin-behavior',
       1 => 'javelin-dom',
     ),
-    '62e18640' =>
-    array(
-      0 => 'javelin-install',
-      1 => 'javelin-util',
-      2 => 'javelin-dom',
-      3 => 'javelin-typeahead-normalizer',
-    ),
     '75903ee1' =>
     array(
       0 => 'javelin-behavior',
@@ -1313,12 +1313,7 @@ return array(
       0 => 'herald-rule-editor',
       1 => 'javelin-behavior',
     ),
-    '7ee2b591' =>
-    array(
-      0 => 'javelin-behavior',
-      1 => 'javelin-history',
-    ),
-    '7ff0b011' =>
+    '7ee23816' =>
     array(
       0 => 'javelin-behavior',
       1 => 'javelin-dom',
@@ -1330,6 +1325,11 @@ return array(
       7 => 'javelin-vector',
       8 => 'phabricator-shaped-request',
     ),
+    '7ee2b591' =>
+    array(
+      0 => 'javelin-behavior',
+      1 => 'javelin-history',
+    ),
     '82947dda' =>
     array(
       0 => 'javelin-behavior',

src/applications/conpherence/controller/ConpherenceUpdateController.php

@@ -51,7 +51,7 @@ final class ConpherenceUpdateController
             $conpherence->getPHID());
           $draft->setDraft($request->getStr('text'));
           $draft->replaceOrDelete();
-          break;
+          return new AphrontAjaxResponse();
         case ConpherenceUpdateActions::MESSAGE:
           $message = $request->getStr('text');
           $xactions = $editor->generateTransactionsFromText(

src/infrastructure/javelin/markup.php

@@ -11,13 +11,17 @@ function javelin_tag(
     foreach ($attributes as $k => $v) {
       switch ($k) {
         case 'sigil':
+          if ($v !== null) {
             $attributes['data-sigil'] = $v;
+          }
           unset($attributes[$k]);
           break;
         case 'meta':
+          if ($v !== null) {
             $response = CelerityAPI::getStaticResourceResponse();
             $id = $response->addMetadata($v);
             $attributes['data-meta'] = $id;
+          }
           unset($attributes[$k]);
           break;
         case 'mustcapture':

webroot/rsrc/js/application/conpherence/behavior-menu.js

@@ -530,8 +530,11 @@ JX.behavior('conpherence-menu', function(config) {
 
   var onkeydownDraft = function (e) {
     var form = e.getNode('tag:form');
+    var data = e.getNodeData('tag:form');
+
+    if (!data.preview) {
       var uri = config.baseURI + 'update/' + _thread.selected + '/';
-    var draftRequest = new JX.PhabricatorShapedRequest(
+      data.preview = new JX.PhabricatorShapedRequest(
         uri,
         JX.bag,
         function () {
@@ -539,7 +542,9 @@ JX.behavior('conpherence-menu', function(config) {
           data.action = 'draft';
           return data;
         });
-    draftRequest.start();
+    }
+
+    data.preview.trigger();
   };
 
   JX.Stratcom.listen(