Function from_children 

pub fn from_children<'a, Message, Theme, Renderer>(
    children: &'a mut [Element<'_, Message, Theme, Renderer>],
    tree: &'a mut Tree,
    layout: Layout<'a>,
    renderer: &Renderer,
    viewport: &Rectangle,
    translation: Vector,
) -> Vec<Element<'a, Message, Theme, Renderer>>
where
    Renderer: Renderer,

Available on crate feature advanced only.

Returns the overlays of the given Element children.

This method will generally only be used by advanced users that are implementing the Widget trait.