finished moving out render_state

core/src/widget/widgets.rs

@@ -104,10 +104,10 @@ impl Widgets {
         self.vec.get_mut(id.id())
     }
 
-    pub fn free(&mut self) {
-        for id in self.recv.try_iter() {
-            self.vec.free(id.id());
-        }
+    pub fn free_next(&mut self) -> Option<WidgetId> {
+        let next = self.recv.try_recv().ok()?;
+        self.vec.free(next);
+        Some(next)
     }
 
     #[allow(clippy::len_without_is_empty)]