title: Show NSSearchFields clear button at all times
body: <p>I want to use the clear <code>✖️</code> button of an <code>NSSearchField</code> to close a search pane. Therefore I have manually set the action and target of the clear button cell. Now the button only appears when the search field has text in it and I can't find a way to override this behavior.</p>
  <p>Is it possible to show the clear button at all times, wether there is text or not?</p>