GH-113: make sure the ongoing children computation is restarted when sorting changes

Author: jisedlac

visualvm/heapviewer/src/org/graalvm/visualvm/heapviewer/model/HeapViewerNode.java

@@ -302,6 +302,9 @@ public final void willBeSorted() {
     }
 
     private boolean updateChildrenOnSort() {
+        // GH-113: make sure the ongoing children computation is restarted when sorting changes
+        synchronized (this) { if (currentWorker != null) return true; }
+        
         return children != null && children.length > 1 && children[children.length - 1] instanceof MoreNodesNode;
     }