title: How to change selected text color locally - flutter
body: <p>Text <strong>selection</strong> color can be changed by globally setting the theme:</p>
  <pre><code>    theme: ThemeData.light().copyWith(
          accentColor: kPrimaryAccent,
          primaryColor: kPrimaryColor,
          textSelectionColor: kTextSelectionColor,
          textSelectionHandleColor: kPrimaryAccent)
  </code></pre>
  <p>But how can this be done <strong>locally</strong> in a single text-field?</p>