Add UiBuilder::with_closable

crates/egui/src/ui_builder.rs

@@ -145,10 +145,24 @@ impl UiBuilder {
     ///
     /// This works by adding a [`ClosableTag`] to the [`UiStackInfo`].
     #[inline]
-    pub fn closable(mut self) -> Self {
+    pub fn closable(self) -> Self {
-        self.ui_stack_info
+        self.with_closable(true)
-            .tags
+    }
-            .insert(ClosableTag::NAME, Some(Arc::new(ClosableTag::default())));
+
+    /// Make this [`Ui`] closable?
+    ///
+    /// Calling [`Ui::close`] in a child [`Ui`] will mark this [`Ui`] for closing.
+    /// After [`Ui::close`] was called, [`Ui::should_close`] and [`crate::Response::should_close`] will
+    /// return `true` (for this frame).
+    ///
+    /// This works by adding a [`ClosableTag`] to the [`UiStackInfo`].
+    #[inline]
+    pub fn with_closable(mut self, closable: bool) -> Self {
+        if closable {
+            self.ui_stack_info
+                .tags
+                .insert(ClosableTag::NAME, Some(Arc::new(ClosableTag::default())));
+        }
         self
     }
 }