Widget.php

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<?php
declare(strict_types=1);
namespace Magento\Tinymce3\Model\Plugin;

use Magento\Tinymce3\Model\Config\Source\Wysiwyg\Editor;

class Widget
{
    private $activeEditor;

    private $placeholderImages;

    private $assetRepo;

    public function __construct(
        \Magento\Ui\Block\Wysiwyg\ActiveEditor $activeEditor,
        \Magento\Framework\View\Asset\Repository $assetRepo,
        \Magento\Tinymce3\Model\Config\Widget\PlaceholderImagesPool $placeholderImages
    ) {
        $this->activeEditor = $activeEditor;
        $this->placeholderImages = $placeholderImages;
        $this->assetRepo = $assetRepo;
    }

    public function aroundGetPlaceholderImageUrl(
        \Magento\Widget\Model\Widget $subject,
        \Closure $proceed,
        string $type
    ) : string {
        if ($this->activeEditor->getWysiwygAdapterPath() !== Editor::WYSIWYG_EDITOR_CONFIG_VALUE) {
            return $proceed($type);
        }
        $placeholders = $this->placeholderImages->getWidgetPlaceholders();
        $defaultImage = $this->assetRepo->getUrl('Magento_Tinymce3::images/widget/placeholder.png');

        if (isset($placeholders[$type])) {
            return $this->assetRepo->getUrl($placeholders[$type]);
        }
        return $defaultImage;
    }
}