auto generate label (TODO: should be moved into widgets now that all have one)

src/layout/ui.rs

@@ -65,6 +65,8 @@ impl<Ctx> Ui<Ctx> {
 
     pub fn push<W: Widget<Ctx>>(&mut self, w: W) -> WidgetId<W> {
         let id = self.id();
+        self.labels
+            .insert(id.id.duplicate(), std::any::type_name::<W>().to_string());
         self.widgets.insert(id.id.duplicate(), w);
         id
     }