Simple override for getItemIds(int,int) for TreeTable (#9509)

server/src/com/vaadin/ui/Table.java

@@ -1968,7 +1968,7 @@ public class Table extends AbstractSelect implements Action.Container,
             // index
 
             Container.Indexed indexed = ((Container.Indexed) items);
-            List<?> itemIds = indexed.getItemIds(firstIndex, rows);
+            List<?> itemIds = getItemIds(firstIndex, rows);
             for (int i = 0; i < rows && i < itemIds.size(); i++) {
                 Object id = itemIds.get(i);
                 // Start by parsing the values, id should already be set
@@ -2017,6 +2017,11 @@ public class Table extends AbstractSelect implements Action.Container,
         return cells;
     }
 
+    protected List<Object> getItemIds(int firstIndex, int rows) {
+        return (List<Object>) ((Container.Indexed) items).getItemIds(
+                firstIndex, rows);
+    }
+
     /**
      * Update a cache array for a row, register any relevant listeners etc.
      * 

server/src/com/vaadin/ui/TreeTable.java

@@ -869,4 +869,12 @@ public class TreeTable extends Table implements Hierarchical {
         return Logger.getLogger(TreeTable.class.getName());
     }
 
+    @Override
+    protected List<Object> getItemIds(int firstIndex, int rows) {
+        List<Object> itemIds = new ArrayList<Object>();
+        for (int i = firstIndex; i < firstIndex + rows; i++) {
+            itemIds.add(getIdByIndex(i));
+        }
+        return itemIds;
+    }
 }