iris: fold render state into Ui

app-rust/tests/fence_fling.rs

@@ -3,7 +3,9 @@ use iris::harness::{Harness, TouchAction};
 use iris::prelude::*;
 
 fn fence_scroll_in(h: &Harness, top: f32, bottom: f32) -> Option<(WidgetId, PixelRegion)> {
-    h.render
+    let render_handle = h.rsc.ui.render_state();
+    let render_state = render_handle.get();
+    render_state
         .active
         .keys()
         .copied()
@@ -16,7 +18,7 @@ fn fence_scroll_in(h: &Harness, top: f32, bottom: f32) -> Option<(WidgetId, Pixe
                 .is_some_and(|s| s.axis() == Axis::X)
         })
         .find_map(|id| {
-            let r = h.render.window_region(&id, &h.rsc)?;
+            let r = render_state.window_region(&id, &h.rsc)?;
             (r.top_left.y >= top && r.bot_right.y <= bottom).then_some((id, r))
         })
 }