[demo] add menu option to auto-reorganize windows

egui/src/demos/app.rs

@@ -236,7 +236,14 @@ impl OpenWindows {
 fn show_menu_bar(ui: &mut Ui, windows: &mut OpenWindows) {
     menu::bar(ui, |ui| {
         menu::menu(ui, "File", |ui| {
-            if ui.add(Button::new("Clear memory")).clicked {
+            if ui.add(Button::new("Reorganize windows")).clicked {
+                ui.ctx().memory().reset_areas();
+            }
+            if ui
+                .add(Button::new("Clear entire Egui memory"))
+                .tooltip_text("Forget scroll, collapsibles etc")
+                .clicked
+            {
                 *ui.ctx().memory() = Default::default();
             }
         });

egui/src/memory.rs

@@ -152,6 +152,12 @@ impl Memory {
             self.interaction.kb_focus_id = None;
         }
     }
+
+    /// Forget window positions, sizes etc.
+    /// Can be used to auto-layout windows.
+    pub fn reset_areas(&mut self) {
+        self.areas = Default::default();
+    }
 }
 
 impl Areas {