14 string references to 'system.theme'

BlockTheme::create in core/modules/block/src/Plugin/migrate/process/BlockTheme.php: Creates an instance of the plugin.
CKEditor5CacheTag::onSave in core/modules/ckeditor5/src/EventSubscriber/CKEditor5CacheTag.php: Invalidates cache tags when particular system config objects are saved.
ConfigCacheTag::onSave in core/modules/system/src/EventSubscriber/ConfigCacheTag.php: Invalidate cache tags when particular system config objects are saved.
ConfigImporter::processExtension in core/lib/Drupal/Core/Config/ConfigImporter.php: Processes an extension change.
FunctionalTestSetupTrait::installDefaultThemeFromClassProperty in core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php: Installs the default theme defined by `static::$defaultTheme` when needed.
SystemConfigSubscriber::onConfigSave in core/modules/system/src/SystemConfigSubscriber.php: Rebuilds the router when the default or admin theme is changed.
SystemController::themesPage in core/modules/system/src/Controller/SystemController.php: Returns a theme listing which excludes obsolete themes.
ThemeAdminForm::getEditableConfigNames in core/modules/system/src/Form/ThemeAdminForm.php: Gets the configuration names that will be editable.
ThemeController::setDefaultTheme in core/modules/system/src/Controller/ThemeController.php: Set the default theme.
ThemeController::uninstall in core/modules/system/src/Controller/ThemeController.php: Uninstalls a theme.
ThemeExperimentalConfirmForm::submitForm in core/modules/system/src/Form/ThemeExperimentalConfirmForm.php: Form submission handler.
ThemeHandler::hasUi in core/lib/Drupal/Core/Extension/ThemeHandler.php: Determines if a theme should be shown in the user interface.
ThemeInstaller::uninstall in core/lib/Drupal/Core/Extension/ThemeInstaller.php: Uninstalls a given list of themes.
_drupal_maintenance_theme in core/includes/theme.maintenance.inc: Sets up the theming system for maintenance page.