title: How can I change the default PopupMenu's text color?
body: <p>I have a <code>MaterialApp</code> with <code>TextField</code>s, and they have the default popup menu (with items &quot;cut&quot;, &quot;copy&quot; and &quot;paste&quot;).</p>
  <p>My problem is: Their text color is always white - so the items are all invisible because my background is also white!</p>
  <p>How can I change the text color of the popup items?</p>