When summing points on a workboard, display sum with same precision as most-precise value

Summary:
Fixes T11703. This mostly avoids rounding errors.

If point values include "0.001", we also get three digits of precision: 1.000.

Maybe useful if your point field is called "bitcoins" or something.

Test Plan:
Before:

{F1851404}

After:

{F1851405}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11703

Differential Revision: https://secure.phabricator.com/D16601

resources/celerity/map.php

@@ -495,7 +495,7 @@ return array(
     'rsrc/js/application/policy/behavior-policy-rule-editor.js' => '5e9f347c',
     'rsrc/js/application/projects/WorkboardBoard.js' => 'fe7cb52a',
     'rsrc/js/application/projects/WorkboardCard.js' => 'c587b80f',
-    'rsrc/js/application/projects/WorkboardColumn.js' => 'bae58312',
+    'rsrc/js/application/projects/WorkboardColumn.js' => '21df4ff5',
     'rsrc/js/application/projects/WorkboardController.js' => '55baf5ed',
     'rsrc/js/application/projects/behavior-project-boards.js' => '14a1faae',
     'rsrc/js/application/projects/behavior-project-create.js' => '065227cc',
@@ -825,7 +825,7 @@ return array(
     'javelin-websocket' => 'e292eaf4',
     'javelin-workboard-board' => 'fe7cb52a',
     'javelin-workboard-card' => 'c587b80f',
-    'javelin-workboard-column' => 'bae58312',
+    'javelin-workboard-column' => '21df4ff5',
     'javelin-workboard-controller' => '55baf5ed',
     'javelin-workflow' => '1e911d0f',
     'lightbox-attachment-css' => '7acac05d',
@@ -1162,6 +1162,10 @@ return array(
       'javelin-stratcom',
       'conpherence-thread-manager',
     ),
+    '21df4ff5' => array(
+      'javelin-install',
+      'javelin-workboard-card',
+    ),
     '2290aeef' => array(
       'javelin-install',
       'javelin-dom',
@@ -1922,10 +1926,6 @@ return array(
       'javelin-uri',
       'phabricator-notification',
     ),
-    'bae58312' => array(
-      'javelin-install',
-      'javelin-workboard-card',
-    ),
     'bb1dd507' => array(
       'javelin-behavior',
       'javelin-stratcom',

webroot/rsrc/js/application/projects/WorkboardColumn.js

@@ -222,6 +222,7 @@ JX.install('WorkboardColumn', {
 
       var points = {};
       var count = 0;
+      var decimal_places = 0;
       for (var phid in cards) {
         var card = cards[phid];
 
@@ -238,6 +239,15 @@ JX.install('WorkboardColumn', {
             points[status] = 0;
           }
           points[status] += card_points;
+
+          // Count the number of decimal places in the point value with the
+          // most decimal digits. We'll use the same precision when rendering
+          // the point sum. This avoids rounding errors and makes the display
+          // a little more consistent.
+          var parts = card_points.toString().split('.');
+          if (parts[1]) {
+            decimal_places = Math.max(decimal_places, parts[1].length);
+          }
         }
 
         count++;
@@ -247,6 +257,7 @@ JX.install('WorkboardColumn', {
       for (var k in points) {
         total_points += points[k];
       }
+      total_points = total_points.toFixed(decimal_places);
 
       var limit = this.getPointLimit();