fix(core): 🐛 allow children to be hit outside the boundaries for non-…

[M-Adoo]

…fixed-size container

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[wjian23]

it seems the size should be expand by the position + size_box? it seems a bit strange, if it just with red background in a top_left corner, as the example bellow:

stack! {
    background: Color::RED,
    @SizedBox {
        anchor: Anchor::left_top(100., 100.),
        size: Size::new(100., 100.),
    }
 }

[M-Adoo]

I want to keep the layout simple and consistent. If we make the size bigger towards the bottom right, why not make it bigger towards the top left if a child is in a negative position?

I set the stack's size to fit its children, ignoring their positions. This way allow their children hit and paint outside the stack.