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/hover.rs

@@ -132,6 +132,13 @@ impl RenderOnce for HoverCard {
                 .size_full(),
             );
         let (anchor, height) = (state.read(cx).host, state.read(cx).height);
-        host.child(float_height(anchor, height, card, window, cx))
+        host.child(float_height(
+            self.id.clone(),
+            anchor,
+            height,
+            card,
+            window,
+            cx,
+        ))
     }
 }