Bug 268533 [Viewers] Weird painting when using MOUSE_CLICK_ACTIVATION
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/FocusCellHighlighter.java
*/
	protected void focusCellChanged(ViewerCell cell) {
	}
	/**
	 * Called by the framework when the focus cell has changed. Subclasses may
	 * extend.
	 * <p>
	 * <b>The default implementation for this method calls
	 * focusCellChanged(ViewerCell). Subclasses should override this method
	 * rather than {@link #focusCellChanged(ViewerCell)} .</b>
	 *
	 * @param newCell
	 *            the new focus cell or <code>null</code> if no new cell
	 *            receives the focus
	 * @param oldCell
	 *            the old focus cell or <code>null</code> if no cell has been
	 *            focused before
	 * @since 3.4
	 */
	protected void focusCellChanged(ViewerCell newCell, ViewerCell oldCell) {
		focusCellChanged(newCell);
	}
	/**
	 * This method is called by the framework to initialize this cell
	 * highlighter object. Subclasses may extend.
	 */
	protected void init() {
	}
}