BlockContentWorkspaceHandler.php

<?php

namespace Drupal\workspaces\Entity\Handler;

use Drupal\Core\Entity\EntityInterface;

/**
 * Provides a custom workspace handler for block_content entities.
 *
 * @internal
 */
class BlockContentWorkspaceHandler extends DefaultWorkspaceHandler {
    
    /**
     * {@inheritdoc}
     */
    public function isEntitySupported(EntityInterface $entity) : bool {
        // Only reusable blocks can be tracked individually. Non-reusable or inline
        // blocks are tracked as part of the entity they are a composite of.
        
        /** @var \Drupal\block_content\BlockContentInterface $entity */
        return $entity->isReusable();
    }

}