Provide feedback to the user if they try to enter a repeat of a keyword
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3560874. -->
Reported by: [justafish](https://www.drupal.org/user/161058)
Related to !116
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>When a user attempts to enter a duplicate keyword, they should receive an error.</p>
<ul>
<li>The error will only show when the user tries to save the keyword with the Enter or Tab key</li>
<li>It’s ok for the elements underneath the error to shift down to show the error message</li>
<li>Dismiss the error message when the new tag input is empty, or if the user submits a valid keyword</li>
<li>
</ul>
issue