Primitives · a raise keeps its state under its owner's id

A raise inside another was namespaced by its place in the layer's
queue, so one that came before it moved its id path and rebuilt its
keyed state and focus: an open date popup would lose its month when a
tip appeared. raise now takes its owner's id and draws under it, and
float and float_height pass the owner's id on from every call site.
A test holds a focused box in a raise while another comes before it.

src/menus/pie.rs

@@ -303,6 +303,7 @@ impl RenderOnce for PieMenu {
             });
         region.child(
             raise(
+                (self.id.clone(), "raised"),
                 anchored()
                     .position(point(Pixels::ZERO, Pixels::ZERO))
                     .child(