Bug 232048 [Viewers] binary incompatibility (adding public fields) reported against jface.viewers
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
* Subclasses may override
	 * </p>
	 */
	public void performSelectAll() {
	}
	/**
	 * Performs the undo action. This default implementation does nothing.
	 * <p>
	 * Subclasses may override
	 * </p>
	 */
	public void performUndo() {
	}
	/**
	 * Removes the given listener from this cell editor. Has no affect if an
	 * identical listener is not registered.
	 *
	 * @param listener
	 *            a cell editor listener
	 */
	public void removeListener(ICellEditorListener listener) {
		listeners.remove(listener);
	}
	/**
	 * Removes the given property change listener from this cell editor. Has no
	 * affect if an identical property change listener is not registered.
	 *
	 * @param listener
	 *            a property change listener
	 */