Bug 161425 [Viewers] TableTreeViewer => EditingSupport broken
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableTreeViewer.java
private CellEditor cellEditor;
		private CellEditor[] cellEditors;
		private ICellModifier cellModifier;
		private String[] columnProperties;
		private Item tableItem;
		private int columnNumber;
		private ICellEditorListener cellEditorListener;
		private FocusListener focusListener;
		private MouseListener mouseListener;
		private int doubleClickExpirationTime;
		private ColumnViewer viewer;
		private TableTreeEditorImpl(ColumnViewer viewer) {
			this.viewer = viewer;
			initCellEditorListener();
		}
		/**
		 * Returns this <code>TableViewerImpl</code> viewer
		 * 
		 * @return the viewer
		 */