Bug 159550 [Viewers] Deprecate TableTreeViewer
The underlying SWT-controls of TableTreeViewer (TableTree,TableTreeItem,TableTreeEditor) are deprecated and so should TableTreeViewer I think.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableTreeViewer.java
void setLayoutData(CellEditor.LayoutData layoutData) {
            tableTreeEditor.horizontalAlignment = layoutData.horizontalAlignment;
            tableTreeEditor.grabHorizontal = layoutData.grabHorizontal;
            tableTreeEditor.minimumWidth = layoutData.minimumWidth;
        }
        void handleDoubleClickEvent() {
            Viewer viewer = getViewer();
            fireDoubleClick(new DoubleClickEvent(viewer, viewer.getSelection()));
            fireOpen(new OpenEvent(viewer, viewer.getSelection()));
        }
    }
    /**
     * Creates a table tree viewer on the given table tree control.
     * The viewer has no input, no content provider, a default label provider, 
     * no sorter, and no filters.
     *
     * @param tree the table tree control
     */
    public TableTreeViewer(TableTree tree) {
        super();
        tableTree = tree;
        hookControl(tree);
        tableTreeEditor = new TableTreeEditor(tableTree);
        tableViewerImpl = new TableTreeViewerImpl(this);
    }
    /**
     * Creates a table tree viewer on a newly-created table tree control under the given parent.
     * The table tree control is created using the SWT style bits <code>MULTI, H_SCROLL, V_SCROLL, and BORDER</code>.
     * The viewer has no input, no content provider, a default label provider, 
     * no sorter, and no filters.