iris: fold render state into Ui

src/widget/text/mod.rs

@@ -222,9 +222,7 @@ mod tests {
     use crate::prelude::*;
 
     fn rendered_text(content: &str) -> (TestRsc, UiRenderState, WeakWidget<Text>, StrongWidget) {
-        let mut rsc = TestRsc {
-            ui: UiData::default(),
-        };
+        let mut rsc = TestRsc { ui: Ui::default() };
         let text = wtext(content).add_strong(&mut rsc);
         let id = text.weak();
         let root = text.any();
@@ -306,9 +304,7 @@ mod tests {
 
     #[test]
     fn clearing_the_atlas_re_renders_cached_text_instead_of_reusing_it() {
-        let mut rsc = TestRsc {
-            ui: UiData::default(),
-        };
+        let mut rsc = TestRsc { ui: Ui::default() };
         let root = wtext("hello there")
             .size(18)
             .color(PaintId::WHITE)