Function use_rect_refresh 

pub fn use_rect_refresh() -> RectRefresh

The provider tree’s RectRefresh channel: ping refresh_all() after you move layout under a live drag (scrolling a custom container, collapsing a panel) so hit-testing and data-over track the new geometry. crate::autoscroll::AutoScroll pings it for you.

Panics

Panics if no ancestor provided a drag context.