Function gallery_grid 

pub fn gallery_grid<T, F>(
    ui: &mut Ui,
    config: GalleryConfig<'_>,
    state: &mut GalleryState,
    items: &[T],
    header_extra: impl FnOnce(&mut Ui),
    draw_tile: F,
)
where
    F: FnMut(&mut Ui, &T, f32, &mut GalleryState),