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/layout/floating.rs

@@ -101,7 +101,7 @@ impl RenderOnce for FloatingPanel {
         };
         let panel = self
             .base
-            .id(self.id)
+            .id(self.id.clone())
             .flex()
             .flex_col()
             .overflow_hidden()
@@ -149,7 +149,7 @@ impl RenderOnce for FloatingPanel {
                     .child(self.title),
             )
             .child(div().p_3().children(self.body));
-        raise(anchored().position(at).child(panel))
+        raise((self.id, "raised"), anchored().position(at).child(panel))
     }
 }