Bug 232048 [Viewers] binary incompatibility (adding public fields) reported against jface.viewers
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CellEditor.java
/**
	 * Optional cell editor validator; <code>null</code> if none.
	 */
	private ICellEditorValidator validator = null;
	/**
	 * The error message string to display for invalid values; <code>null</code>
	 * if none (that is, the value is valid).
	 */
	private String errorMessage = null;
	/**
	 * Indicates whether this cell editor has been changed recently.
	 */
	private boolean dirty = false;
	/**
	 * This cell editor's control, or <code>null</code> if not created yet.
	 */
	private Control control = null;
	/**
	 * Default cell editor style
	 */
	private static final int defaultStyle = SWT.NONE;
	/**
	 * This cell editor's style
	 */
	private int style = defaultStyle;
	/**
	 * Struct-like layout data for cell editors, with reasonable defaults for
	 * all fields.
	 */
	public static class LayoutData {