Refactor overwritten setting description into a after_build callback
>>> [!note] Migrated issue
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<!-- Migrated from issue #3255273. -->
Reported by: [chr.fritsch](https://www.drupal.org/user/2103716)
Related to !72
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>The code for a overwritten setting in the theme form is there multiple times and could be refactored.</p>
issue