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/overlays/lightbox.rs

@@ -291,8 +291,11 @@ impl RenderOnce for Lightbox {
                             ),
                     ),
             );
-        raise(anchored().position(Point::default()).child(stage))
-            .with_priority(1)
-            .into_any_element()
+        raise(
+            (self.id.clone(), "raised"),
+            anchored().position(Point::default()).child(stage),
+        )
+        .with_priority(1)
+        .into_any_element()
     }
 }