Function paint_range 

pub fn paint_range<Msg>(
    scene: &mut Scene,
    mounted: &Mounted<Msg>,
    computed: &ComputedLayout,
    typesetter: &mut Typesetter,
    hover_idx: Option<usize>,
    drop_hover_idx: Option<usize>,
    start: usize,
    end: usize,
    base_xf: Affine,
)