Function anchor_placement 

pub fn anchor_placement(
    anchor: &AnchoredRect,
    area: Rect,
) -> Option<RatatuiAnchor>

Translates an anchor and its accumulated visible intersection into area.

Returns None when no part of the anchor survived core layout clipping or when its translated coordinates are not representable by Ratatui. The caller still owns the buffer and decides how to draw the foreign content.