removeUnused example

        // use the theme persister class to write the Shopware\Components\Form elements into the database         $this->persister->save($container, $template);

        $this->eventManager->notify('Theme_Configurator_Theme_Config_Saved', [
            'theme' => $theme,
            'template' => $template,
            'container' => $container,
        ]);

        $this->removeUnused(
            $this->getLayout($template),
            $this->getElements($template),
            $container
        );

        $this->synchronizeSets($theme, $template);

        $this->eventManager->notify('Theme_Configurator_Theme_Config_Synchronized', [
            'theme' => $theme,
            'template' => $template,
            'container' => $container,
        ]);