[FIXED JENKINS-18119] Work around timing issue in sortable object.

Note that when workaround is active, table will not get sorted properly.
Probably OK since tables with large contents that *need* sorting probably take longer to finish rendering.

changelog.html

@@ -58,6 +58,9 @@ Upcoming changes</a>
   <li class=bug>
     User icon in People broken if Jenkins root URL unconfigured.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-18118">issue 18118</a>)
+  <li class=bug>
+    Progress bar sometimes broken in People.
+    (<a href="https://issues.jenkins-ci.org/browse/JENKINS-18119">issue 18119</a>)
 </ul>
 </div><!--=TRUNK-END=-->
 

core/src/main/java/jenkins/util/ProgressiveRendering.java

@@ -44,7 +44,7 @@ import org.kohsuke.stapler.bind.JavaScriptMethod;
  * (since it may be canceled if the user simply browses to another page while it is running).
  * <ol>
  * <li>Write a {@code <script>} section defining {@code function display(data)}.
- *     (Call {@code document.getElementById('someid').sortable.refresh()} if using a {@code sortable} table.)
+ *     (Call {@code var t = document.getElementById('someid'); if (t.sortable != null) t.sortable.refresh()} if using a {@code sortable} table.)
  * <li>Use {@code <l:progressiveRendering handler="${it.something()}" callback="display"/>} from your
  *     Jelly page to display a progress bar and initialize JavaScript infrastructure.
  *     (The callback attribute can take arbitrary JavaScript expression to be evaluated in the browser

core/src/main/resources/hudson/model/View/AsynchPeople/index.jelly

@@ -88,7 +88,9 @@ THE SOFTWARE.
                   }
                   r.appendChild(d);
 
-                  p.sortable.refresh();
+                  if (p.sortable != null) {
+                      p.sortable.refresh();
+                  }
               }
           }
       </script>