Hm... I am trying to add one leaf to the root:
var location = new locationList.Node();
location.setName("location");
data[0].getChildren().push(location);
var treeController = new qx.data.controller.Tree(data[0], tree, "children",
"name");
As you can see, I leave the "children" property empty, but this node still
looks (has icon) like a qx.ui.tree.TreeFolder, not qx.ui.tree.TreeFile
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