Fix offset inside iframe body caused by Gin Toolbar
>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3559956. --> Reported by: [norman.lol](https://www.drupal.org/user/2482808) Related to !145 !148 >>> <h3 id="summary-problem-motivation">Problem/Motivation</h3> <p>The new default vertical toolbar from Gin Toolbar adds an undesired offset to the top of the frontend editing sidebar.</p> <p>Removing the <code>.gin--navigation</code> class from the body inside the iframe resolves this issue.</p> <p><img src="https://www.drupal.org/files/issues/2025-11-26/Screenshot%202025-11-26%20at%2000.53.52.png" alt="Screenshot of undesired spacing offset"></p> <h4 id="summary-steps-reproduce">Steps to reproduce</h4> <h3 id="summary-proposed-resolution">Proposed resolution</h3> <p>Skip or override <code>gin_toolbar_preprocess_html</code> where this class gets added.</p> <h3 id="summary-remaining-tasks">Remaining tasks</h3> <h3 id="summary-ui-changes">User interface changes</h3> <h3 id="summary-api-changes">API changes</h3> <h3 id="summary-data-model-changes">Data model changes</h3>
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