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/WizardDialog.java
*/
private void updateDescriptionMessage() {
	pageDescription = currentPage.getDescription();
	if (pageMessage == null) 
		setMessage(currentPage.getDescription());
}
/* (non-Javadoc)
 * Method declared on IWizardContainer.
 */
public void updateMessage() {
	if (getTitleArea() == null)
		return;
	pageMessage = currentPage.getMessage();
	if (pageMessage != null && currentPage instanceof IMessageProvider) 
		pageMessageType = ((IMessageProvider)currentPage).getMessageType();
	else
		pageMessageType = IMessageProvider.NONE;
		 
	if (pageMessage == null)
		setMessage(pageDescription);
	else
		setMessage(pageMessage, pageMessageType);
	setErrorMessage(currentPage.getErrorMessage());
}
/**
 * Changes the shell size to the given size, ensuring that
 * it is no larger than the display bounds.
 * 
 * @param width the shell width
 * @param height the shell height