common files search results supports child row

Core/src/org/sleuthkit/autopsy/commonfilesearch/CommonFilesPanel.java

@@ -88,7 +88,7 @@ public final class CommonFilesPanel extends javax.swing.JPanel {
 
                     DataResultFilterNode dataResultFilterNode = new DataResultFilterNode(contentFilesNode, DirectoryTreeTopComponent.findInstance().getExplorerManager());
                                         
-                    TableFilterNode tableFilterNode = new TableFilterNode(dataResultFilterNode, true);
+                    TableFilterNode tableFilterNode = new TableFilterNode(dataResultFilterNode);
                     
                     TopComponent component = DataResultTopComponent.createInstance(
                             title,

Core/src/org/sleuthkit/autopsy/corecomponents/TableFilterChildrenWithDescendants.java

@@ -0,0 +1,47 @@
+/*
+ * 
+ * Autopsy Forensic Browser
+ * 
+ * Copyright 2018 Basis Technology Corp.
+ * Contact: carrier <at> sleuthkit <dot> org
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.sleuthkit.autopsy.corecomponents;
+
+import org.openide.nodes.Children;
+import org.openide.nodes.Node;
+
+/**
+ * Provides TableFilterChildren functionality, and adds support for children 
+ * of rows (plus/minus buttons for each row with children).
+ */
+class TableFilterChildrenWithDescendants extends TableFilterChildren {
+    
+    private TableFilterChildrenWithDescendants(Node wrappedNode) {
+        super(wrappedNode);
+    }
+    
+    public static Children createInstance(Node wrappedNode, boolean createChildren){
+        if(createChildren){
+            return new TableFilterChildrenWithDescendants(wrappedNode);
+        } else {
+            return Children.LEAF;
+        }
+    }
+    
+    @Override
+    protected Node copyNode(Node nodeToCopy){
+        return new TableFilterNode(nodeToCopy, true);
+    }    
+}

Core/src/org/sleuthkit/autopsy/corecomponents/TableFilterNode.java

@@ -49,6 +49,16 @@ public class TableFilterNode extends FilterNode {
         super(node, TableFilterChildren.createInstance(node, createChildren), Lookups.proxy(node));
         this.createChildren = createChildren;
     }
+    
+    /**
+     * Constructs a filter node that generates children using TableFilterChildrenWithDescendants.
+     * This enables row to have descendants.
+     * @param node The node to wrap
+     */
+    public TableFilterNode(Node node){
+        super(node, TableFilterChildrenWithDescendants.createInstance(node, true), Lookups.proxy(node));
+        this.createChildren = true;
+    }
 
     /**
      * Constructs a filter node that creates at most one layer of child nodes