fix on_id widget refcount leak (-> memory leak)

src/layout/ui.rs

@@ -3,8 +3,8 @@ use image::DynamicImage;
 use crate::{
     core::{TextEdit, TextEditCtx},
     layout::{
-        Event, EventFn, EventModule, IdLike, PainterData, PixelRegion, StaticWidgetId,
-        TextureHandle, Vec2, Widget, WidgetId, WidgetInstance, WidgetLike,
+        Event, EventFn, EventModule, IdLike, PainterData, PixelRegion, TextureHandle, Vec2, Widget,
+        WidgetId, WidgetInstance, WidgetLike,
     },
     util::{HashSet, Id},
 };
@@ -30,14 +30,6 @@ impl Ui {
         w.add(self)
     }
 
-    pub fn add_static<W: Widget, Tag>(
-        &mut self,
-        w: impl WidgetLike<Tag, Widget = W>,
-    ) -> StaticWidgetId<W> {
-        let id = w.add(self);
-        id.into_static()
-    }
-
     /// useful for debugging
     pub fn set_label<W>(&mut self, id: &WidgetId<W>, label: String) {
         self.data.widgets.data_mut(&id.id).unwrap().label = label;
@@ -79,7 +71,6 @@ impl Ui {
             self.data.widgets.reserve(),
             TypeId::of::<W>(),
             self.send.clone(),
-            false,
         )
     }
 
@@ -215,21 +206,6 @@ impl<W: Widget> IndexMut<&WidgetId<W>> for Ui {
     }
 }
 
-impl<W: Widget> Index<StaticWidgetId<W>> for Ui {
-    type Output = W;
-
-    fn index(&self, id: StaticWidgetId<W>) -> &Self::Output {
-        self.data.widgets.get(&id).unwrap()
-    }
-}
-
-impl<W: Widget> IndexMut<StaticWidgetId<W>> for Ui {
-    fn index_mut(&mut self, id: StaticWidgetId<W>) -> &mut Self::Output {
-        self.updates.insert(id.id);
-        self.data.widgets.get_mut(&id).unwrap()
-    }
-}
-
 impl dyn Widget {
     pub fn as_any(&self) -> &dyn Any {
         self