better global state structure?

src/widget/image.rs

@@ -22,7 +22,7 @@ impl Widget for Image {
 pub fn image<State: HasUi>(image: impl LoadableImage) -> impl WidgetFn<State, Image> {
     let image = image.get_image().expect("Failed to load image");
     move |state| Image {
-        handle: state.ui().add_texture(image),
+        handle: state.get_mut().add_texture(image),
     }
 }