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/forms/date/period.rs

@@ -228,6 +228,7 @@ fn period_picker(
             };
             let grid = period_grid(&key, build(shown), grid, window, cx);
             float(
+                key.clone(),
                 anchor,
                 6,
                 surface((key.clone(), "popup"), cx)

src/forms/date/picker.rs

@@ -246,6 +246,7 @@ impl RenderOnce for DatePicker {
                 }
                 let (escape, done) = (close.clone(), close.clone());
                 float(
+                    id.clone(),
                     anchor,
                     CALENDAR_ROWS,
                     surface((id.clone(), "popup"), cx)
@@ -347,6 +348,7 @@ impl RenderOnce for DateRangePicker {
                 }
                 let (hover, pick, escape) = (state.clone(), state.clone(), close.clone());
                 float(
+                    id.clone(),
                     anchor,
                     CALENDAR_ROWS,
                     surface((id.clone(), "popup"), cx)

src/forms/date/time.rs

@@ -256,6 +256,7 @@ impl RenderOnce for TimePicker {
                 let columns = time_columns(&id, time, step, commit.clone(), window, cx);
                 let out = close.clone();
                 float(
+                    id.clone(),
                     anchor,
                     CALENDAR_ROWS,
                     surface((id.clone(), "popup"), cx)
@@ -368,6 +369,7 @@ impl RenderOnce for DateTimePicker {
                 );
                 let out = close.clone();
                 float(
+                    id.clone(),
                     anchor,
                     CALENDAR_ROWS,
                     surface((id.clone(), "popup"), cx)

src/forms/date/week.rs

@@ -77,6 +77,7 @@ impl RenderOnce for WeekPicker {
                 }
                 let (escape, out, on_change) = (close.clone(), close.clone(), on_change.clone());
                 float(
+                    id.clone(),
                     anchor,
                     CALENDAR_ROWS,
                     surface((id.clone(), "popup"), cx)