Function draw_hover_tooltip_on 

pub fn draw_hover_tooltip_on(
    scene: &mut Scene,
    transform: Affine,
    text_renderer: &mut TextRenderer,
    theme: &Theme,
    anchor: (Rect, TooltipSide),
    label: &str,
    viewport: Rect,
)

draw_hover_tooltip on the side of its anchor the control prefers.