Bug 232048 [Viewers] binary incompatibility (adding public fields) reported against jface.viewers
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
* Returns <code>true</code> if this cell editor is able to perform the
	 * delete action.
	 * <p>
	 * This default implementation always returns <code>false</code>.
	 * </p>
	 * <p>
	 * Subclasses may override
	 * </p>
	 *
	 * @return <code>true</code> if delete is possible, <code>false</code>
	 *         otherwise
	 */
	public boolean isDeleteEnabled() {
		return false;
	}
	/**
	 * Returns whether the value of this cell editor has changed since the last
	 * call to <code>setValue</code>.
	 *
	 * @return <code>true</code> if the value has changed, and
	 *         <code>false</code> if unchanged
	 */
	public boolean isDirty() {
		return dirty;
	}
	/**
	 * Marks this cell editor as dirty.
	 *
	 * @since 2.1
	 */