StructureManager.php

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<?php
namespace Magento\Backend\Model\View\Layout;

use Magento\Framework\View\Layout\ScheduledStructure;
use Magento\Framework\View\Layout\Data\Structure;

class StructureManager
{
    public function removeElement(
        ScheduledStructure $scheduledStructure,
        Structure $structure,
        $elementName,
        $isChild = false
    ) {
        $elementsToRemove = array_keys($structure->getChildren($elementName));
        $scheduledStructure->unsetElement($elementName);
        foreach ($elementsToRemove as $element) {
            $this->removeElement($scheduledStructure, $structure, $element, true);
        }
        if (!$isChild) {
            $structure->unsetElement($elementName);
        }
        return true;
    }
}