Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/wizard/IWizardNode.java
* <p>
 * If the content has not yet been created, calling this method
 * does not trigger the creation of the wizard. This allows
 * this node to suggest an extent in advance of actually creating 
 * the wizard.
 * </p>
 *
 * @return the extent, or <code>(-1, -1)</code> extent is not known
 */
public Point getExtent();
/**
 * Returns the wizard this node stands for.
 * <p>
 * If the content has not been created beforehand, calling this
 * method triggers the creation of the wizard and caches it so that
 * the identical wizard object is returned on subsequent calls.
 * </p>
 *
 * @return the wizard
 */ 
public IWizard getWizard();
/**
 * Returns whether a wizard has been created for this node.
 *
 * @return <code>true</code> if a wizard has been created,
 *   and <code>false</code> otherwise
 */
public boolean isContentCreated();
}