'packed' => 'PackedImageGallery',
'packed-hover' => 'PackedHoverImageGallery',
'packed-overlay' => 'PackedOverlayImageGallery',
+ 'slideshow' => 'SlideshowImageGallery',
];
// Allow extensions to make a new gallery format.
Hooks::run( 'GalleryGetModes', [ &self::$modeMapping ] );