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/window/ApplicationWindow.java
if(operationInProgress)
		return false;
		
	if (super.close()) {
		menuBarManager = null;
		toolBarManager = null;
		statusLineManager = null;
		return true;
	}
	return false;
}
/* (non-Javadoc)
 * Method declared on Window.
 * Sets the ApplicationWindows's content layout.
 * This vertical layout supports a fixed size Toolbar area, a separator line,
 * the variable size content area,
 * and a fixed size status line.
 */
protected void configureShell(Shell shell) {
	super.configureShell(shell);
	
	if (menuBarManager != null) {
		menuBarManager.updateAll(true);
		shell.setMenuBar(menuBarManager.createMenuBar(shell));
	}
	
	shell.setLayout(new ApplicationWindowLayout());
	if (! "carbon".equals(SWT.getPlatform()))
		 new Label(shell, SWT.SEPARATOR | SWT.HORIZONTAL);
	createToolBarControl(shell);