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/messaging/status.rs

@@ -197,6 +197,7 @@ impl RenderOnce for StatusSetter {
                         done(window, cx);
                     });
                 float_height(
+                    popup_id.clone(),
                     anchor,
                     height,
                     surface((popup_id, "popup"), cx)