Function attach_rich_tooltip_source_with_placement 

pub fn attach_rich_tooltip_source_with_placement(
    ctx: &mut BuildContext<'_>,
    anchor_id: WidgetId,
    source: RichTooltipSource,
    delay: Duration,
    placement: TooltipPlacement,
) -> WidgetId

attach_rich_tooltip_source with an explicit TooltipPlacement — the placement-aware entry point used by widgets that live in a vertical list (menu items, list/tree rows, activity-rail items) and want Side.