iris: ScrollArea measures its content instead of drawing it twice

A container that probes a child's size was still doing it with a real
draw, so `Painter::measure` existed and almost nothing used it. Tracing
every draw of one streamed frame: 1,083 `Widget::draw` calls over 113
distinct widgets, the worst drawn 11 times at nesting depth 7-8, every
one of them mode `Draw` and none of them dirty. The cache was working --
each of the 11 was offered a genuinely different region, alternating
between an oversized probe box and a real one.

ScrollArea::draw was one of the two sources. It drew its whole content
at a box built from a stale hint, read the length back, corrected the
scroll position, and drew the content again where it belonged. The first
of those is now a measurement.

The other half is the measure fast path. A widget's reported size is a
function of its own state and the size it was offered, not of where it
was offered -- so an undirtied widget already drawn at a region of this
size has already answered, and `active.size` is the answer. This is the
same assumption `mov` makes one branch further down (same offered size,
therefore identical output, therefore a translation); it is only stated
as a size here rather than acted on as a move. Without it a measurement
costs a full recursive walk, which is what made the nesting compound.

A measurement now also peeks at the redraw mark instead of consuming it
-- it is not the redraw the mark asked for, and swallowing it would
leave the widget stale until something marked it again.

453 draws from 1,083, and the streamed frame is p50 1.18ms (from 1.22ms,
and 2.20ms before this run of work). The headless phone render is
byte-identical to the previous commit's on the real GPU.

What is deliberately NOT here: the same change to `Span::draw`'s phase 1,
which is the remaining 2x and which moves the layout by a few pixels.
The layout stays intact -- it is a position difference, not a broken
frame -- but which of the two is correct was not established, and the
suspicion (that phase 2 now takes `mov`, and `mov` accumulates deltas
where a redraw recomputes) points at a bug in `mov` rather than in
`Span`. Written up in docs/IRIS_TODO.md with Iris's target shape for
`Span`: no probe phase at all for `abs` children, and a `rest` child
forcing a reposition pass rather than a redraw.

core/src/ui/render_state.rs

@@ -509,14 +509,39 @@ impl UiRenderState {
         // and, with `LazySpan` setting no mask, outside the list's own bounds:
         // the doubled `Compacted:` row in docs/bench/iris-phone-v2-2026-09-06.md.
         // The same shape reaches any dirty widget an ancestor redraws first.
-        // A measurement consumes no redraw mark and takes none of the
-        // fast paths: it is not the redraw the mark asked for, and
-        // "already drawn at this region" would make it return without
-        // reporting a size at all.
-        let dirty = !mode.measuring() && rsc.widgets_mut().needs_redraw.remove(&id);
-        if let Some(active) = self.active.get_mut(&id)
+        // A measurement **peeks** at the mark rather than consuming it: it
+        // is not the redraw the mark asked for, and swallowing it would
+        // leave the widget stale until something else marked it again.
+        let dirty = if mode.measuring() {
+            rsc.widgets().needs_redraw.contains(&id)
+        } else {
+            rsc.widgets_mut().needs_redraw.remove(&id)
+        };
+
+        // What a measurement can answer without drawing at all.
+        //
+        // A widget's reported size is a function of its own state and the
+        // size it was offered -- not of where it was offered. So an
+        // undirtied widget already drawn at a region of this size has
+        // *already answered this question*, and `active.size` is that
+        // answer. This is the same assumption `mov` below already makes
+        // (same offered size, therefore identical output, therefore a
+        // translation rather than a redraw); it is only stated here as a
+        // size rather than acted on as a move.
+        //
+        // Without it a measurement costs a full recursive walk of the
+        // subtree, and since the containers that measure nest, that walk
+        // is what made one streamed frame 1,083 `Widget::draw` calls over
+        // 113 distinct widgets.
+        if mode.measuring() {
+            if let Some(active) = self.active.get(&id)
+                && !dirty
+                && active.region.size() == region.size()
+            {
+                return active.size;
+            }
+        } else if let Some(active) = self.active.get_mut(&id)
             && !dirty
-            && !mode.measuring()
         {
             // check to see if we can skip drawing first
             if active.region == region {