context: function SelectFolder(folderUri){  var folderTree = GetFolderTree();  var folderResource = RDF.GetResource(folderUri);  var msgFolder = folderResource.QueryInterface(Components.interfaces.nsIMsgFolder);  // before we can select a folder, we need to make sure it is "visible"  // in the tree.  to do that, we need to ensure that all its  // ancestors are expanded  var folderIndex = EnsureFolderIndex(folderTree.builderView, msgFolder);  ChangeSelection(folderTree, folderIndex);}
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