[slider] bug fix: generate unique id for sliders

egui/src/containers/collapsing_header.rs

@@ -179,7 +179,7 @@ impl CollapsingHeader {
         // TODO: horizontal layout, with icon and text as labels. Insert background behind using Frame.
 
         let title = label.text();
-        let id = ui.make_unique_id(title);
+        let id = ui.make_unique_child_id(title);
 
         let available = ui.available_finite();
         let text_pos = available.min + vec2(ui.style().indent, 0.0);

egui/src/containers/menu.rs

@@ -55,7 +55,7 @@ fn menu_impl<'c>(
 ) {
     let title = title.into();
     let bar_id = ui.id();
-    let menu_id = Id::new(&title);
+    let menu_id = bar_id.with(&title);
 
     let mut bar_state = ui
         .memory()

egui/src/ui.rs

@@ -280,7 +280,7 @@ impl Ui {
     /// Use this to generate widget ids for widgets that have persistent state in Memory.
     /// If the `id_source` is not unique within this ui
     /// then an error will be printed at the current cursor position.
-    pub fn make_unique_id<IdSource>(&self, id_source: IdSource) -> Id
+    pub fn make_unique_child_id<IdSource>(&self, id_source: IdSource) -> Id
     where
         IdSource: Hash + std::fmt::Debug,
     {

egui/src/widgets/slider.rs

@@ -105,7 +105,7 @@ impl<'a> Widget for Slider<'a> {
 
         if let Some(text) = &self.text {
             if self.id.is_none() {
-                self.id = Some(Id::new(text));
+                self.id = Some(ui.make_unique_child_id(text));
             }
 
             let text_on_top = self.text_on_top.unwrap_or_default();