Function choice_rects 

pub fn choice_rects(
    band: Rect,
    gap: f64,
    secondary: f64,
    primary: f64,
) -> (Rect, Rect)

Where a pair of choices sits on band given the widths they ask for: at the trailing edge at their own width, the answer last, as a dialog’s do, so the card reads as a sentence that ends in its choices rather than a pair of slabs. Equal halves only when both cannot fit at their width. Returns (secondary, primary).