Cancel worker threads whenever their view is closed - truffle part.

Author: jisedlac

visualvm/heapviewer.truffle/src/org/graalvm/visualvm/heapviewer/truffle/TruffleObjectPropertyPlugin.java

@@ -158,6 +158,12 @@ protected JComponent createComponent() {
     }
 
 
+    @Override
+    protected void closed() {
+        objectsView.closed();
+    }
+    
+    
     protected final boolean supportsAggregation() {
         return provider.supportsAggregation();
     }

visualvm/heapviewer.truffle/src/org/graalvm/visualvm/heapviewer/truffle/javaext/TruffleJavaViewPlugin.java

@@ -94,6 +94,12 @@ protected JComponent createComponent() {
     }
 
 
+    @Override
+    protected void closed() {
+        objectsView.closed();
+    }
+    
+    
     protected void nodeSelected(HeapViewerNode node, boolean adjusting) {
         Instance selectedInstance = node == null ? null : HeapViewerNode.getValue(node, DataType.INSTANCE, heap);
         if (Objects.equals(selected, selectedInstance)) return;

visualvm/heapviewer.truffle/src/org/graalvm/visualvm/heapviewer/truffle/javaext/TruffleViewPlugin.java

@@ -102,6 +102,12 @@ protected JComponent createComponent() {
     }
 
 
+    @Override
+    protected void closed() {
+        objectsView.closed();
+    }
+    
+    
     protected void nodeSelected(HeapViewerNode node, boolean adjusting) {
         Instance instance = node == null ? null : HeapViewerNode.getValue(node, DataType.INSTANCE, heap);