diff --git a/crates/egui_demo_app/src/backend_panel.rs b/crates/egui_demo_app/src/backend_panel.rs
index 5966ce683..801ed7d14 100644
--- a/crates/egui_demo_app/src/backend_panel.rs
+++ b/crates/egui_demo_app/src/backend_panel.rs
@@ -417,7 +417,7 @@ impl EguiWindows {
         egui::Window::new("🔧 Settings")
             .open(settings)
             .vscroll(true)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 tmp_ctx.settings_ui(ui);
             });
 
@@ -425,7 +425,7 @@ impl EguiWindows {
         egui::Window::new("🔍 Inspection")
             .open(inspection)
             .vscroll(true)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 tmp_ctx.inspection_ui(ui);
             });
 
@@ -433,7 +433,7 @@ impl EguiWindows {
         egui::Window::new("📝 Memory")
             .open(memory)
             .resizable(false)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 tmp_ctx.memory_ui(ui);
             });
 
@@ -442,7 +442,7 @@ impl EguiWindows {
             .open(output_events)
             .resizable(true)
             .default_width(520.0)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 ui.label(
                     "Recent output events from egui. \
             These are emitted when you interact with widgets, or move focus between them with TAB. \
diff --git a/crates/egui_demo_app/src/wrap_app.rs b/crates/egui_demo_app/src/wrap_app.rs
index 89b71d3d8..13513243a 100644
--- a/crates/egui_demo_app/src/wrap_app.rs
+++ b/crates/egui_demo_app/src/wrap_app.rs
@@ -6,7 +6,6 @@ use eframe::glow;
 
 #[cfg(target_arch = "wasm32")]
 use core::any::Any;
-use std::sync::{Arc, RwLock};
 
 #[derive(Default)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
@@ -185,7 +184,7 @@ pub struct WrapApp {
     #[cfg(any(feature = "glow", feature = "wgpu"))]
     custom3d: Option<crate::apps::Custom3d>,
 
-    dropped_files: Arc<RwLock<Vec<egui::DroppedFile>>>,
+    dropped_files: Vec<egui::DroppedFile>,
 }
 
 impl WrapApp {
@@ -464,20 +463,19 @@ impl WrapApp {
         // Collect dropped files:
         ctx.input(|i| {
             if !i.raw.dropped_files.is_empty() {
-                *self.dropped_files.write().unwrap() = i.raw.dropped_files.clone();
+                self.dropped_files = i.raw.dropped_files.clone();
             }
         });
 
         // Show dropped files (if any):
-        let is_empty = self.dropped_files.read().unwrap().is_empty();
+        let is_empty = self.dropped_files.is_empty();
         if !is_empty {
             let mut open = true;
             let dropped_files = self.dropped_files.clone();
             egui::Window::new("Dropped files")
                 .open(&mut open)
-                .show(ctx, move |ui| {
-                    let dropped_files = &*dropped_files.read().unwrap();
-                    for file in dropped_files {
+                .show(ctx, |ui| {
+                    for file in &dropped_files {
                         let mut info = if let Some(path) = &file.path {
                             path.display().to_string()
                         } else if !file.name.is_empty() {
@@ -492,7 +490,7 @@ impl WrapApp {
                     }
                 });
             if !open {
-                self.dropped_files.write().unwrap().clear();
+                self.dropped_files.clear();
             }
         }
     }
diff --git a/crates/egui_demo_lib/src/demo/code_editor.rs b/crates/egui_demo_lib/src/demo/code_editor.rs
index a6bf352f1..ebf0ef61b 100644
--- a/crates/egui_demo_lib/src/demo/code_editor.rs
+++ b/crates/egui_demo_lib/src/demo/code_editor.rs
@@ -30,7 +30,7 @@ impl super::Demo for CodeEditor {
         egui::Window::new(self.name())
             .open(open)
             .default_height(500.0)
-            .show(ctx, move |ui| self.ui(ui));
+            .show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/code_example.rs b/crates/egui_demo_lib/src/demo/code_example.rs
index 27058e0b5..c72fde221 100644
--- a/crates/egui_demo_lib/src/demo/code_example.rs
+++ b/crates/egui_demo_lib/src/demo/code_example.rs
@@ -75,7 +75,7 @@ impl super::Demo for CodeExample {
             .default_size([800.0, 400.0])
             .vscroll(false)
             .hscroll(true)
-            .show(ctx, move |ui| self.ui(ui));
+            .show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/context_menu.rs b/crates/egui_demo_lib/src/demo/context_menu.rs
index 1171d921d..f8b6bc58a 100644
--- a/crates/egui_demo_lib/src/demo/context_menu.rs
+++ b/crates/egui_demo_lib/src/demo/context_menu.rs
@@ -56,7 +56,7 @@ impl super::Demo for ContextMenus {
             .vscroll(false)
             .resizable(false)
             .open(open)
-            .show(ctx, move |ui| self.ui(ui));
+            .show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/demo_app_windows.rs b/crates/egui_demo_lib/src/demo/demo_app_windows.rs
index 5890645f8..5d4b2d0ad 100644
--- a/crates/egui_demo_lib/src/demo/demo_app_windows.rs
+++ b/crates/egui_demo_lib/src/demo/demo_app_windows.rs
@@ -202,7 +202,7 @@ impl DemoWindows {
                 .open(&mut about_is_open)
                 .resizable(false)
                 .collapsible(false)
-                .show(ctx, move |ui| {
+                .show(ctx, |ui| {
                     let close = close.clone();
                     clone.data.write().unwrap().about.ui(ui);
                     ui.add_space(12.0);
diff --git a/crates/egui_demo_lib/src/demo/drag_and_drop.rs b/crates/egui_demo_lib/src/demo/drag_and_drop.rs
index e88fbc2e7..5dec97583 100644
--- a/crates/egui_demo_lib/src/demo/drag_and_drop.rs
+++ b/crates/egui_demo_lib/src/demo/drag_and_drop.rs
@@ -108,7 +108,7 @@ impl super::Demo for DragAndDropDemo {
             .default_size(vec2(256.0, 256.0))
             .vscroll(false)
             .resizable(false)
-            .show(ctx, move |ui| self.ui(ui));
+            .show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/font_book.rs b/crates/egui_demo_lib/src/demo/font_book.rs
index 16bbafeb1..6a8a7b4ad 100644
--- a/crates/egui_demo_lib/src/demo/font_book.rs
+++ b/crates/egui_demo_lib/src/demo/font_book.rs
@@ -21,12 +21,10 @@ impl super::Demo for FontBook {
     }
 
     fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
-        egui::Window::new(self.name())
-            .open(open)
-            .show(ctx, move |ui| {
-                use super::View as _;
-                self.ui(ui);
-            });
+        egui::Window::new(self.name()).open(open).show(ctx, |ui| {
+            use super::View as _;
+            self.ui(ui);
+        });
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/layout_test.rs b/crates/egui_demo_lib/src/demo/layout_test.rs
index 13b1789fe..2d4fa8a82 100644
--- a/crates/egui_demo_lib/src/demo/layout_test.rs
+++ b/crates/egui_demo_lib/src/demo/layout_test.rs
@@ -82,7 +82,7 @@ impl super::Demo for LayoutTest {
         egui::Window::new(self.name())
             .open(open)
             .resizable(false)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
diff --git a/crates/egui_demo_lib/src/demo/misc_demo_window.rs b/crates/egui_demo_lib/src/demo/misc_demo_window.rs
index 9a2504ffa..61a6091e9 100644
--- a/crates/egui_demo_lib/src/demo/misc_demo_window.rs
+++ b/crates/egui_demo_lib/src/demo/misc_demo_window.rs
@@ -53,7 +53,7 @@ impl Demo for MiscDemoWindow {
             .open(open)
             .vscroll(true)
             .hscroll(true)
-            .show(ctx, move |ui| self.ui(ui));
+            .show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/multi_touch.rs b/crates/egui_demo_lib/src/demo/multi_touch.rs
index e005b2041..c358f6b21 100644
--- a/crates/egui_demo_lib/src/demo/multi_touch.rs
+++ b/crates/egui_demo_lib/src/demo/multi_touch.rs
@@ -31,7 +31,7 @@ impl super::Demo for MultiTouch {
             .open(open)
             .default_size(vec2(512.0, 512.0))
             .resizable(true)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
diff --git a/crates/egui_demo_lib/src/demo/paint_bezier.rs b/crates/egui_demo_lib/src/demo/paint_bezier.rs
index 35c7d8a42..ad507de50 100644
--- a/crates/egui_demo_lib/src/demo/paint_bezier.rs
+++ b/crates/egui_demo_lib/src/demo/paint_bezier.rs
@@ -153,7 +153,7 @@ impl super::Demo for PaintBezier {
             .vscroll(false)
             .resizable(false)
             .default_size([300.0, 350.0])
-            .show(ctx, move |ui| self.ui(ui));
+            .show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/painting.rs b/crates/egui_demo_lib/src/demo/painting.rs
index 71bce1a42..57e5f114d 100644
--- a/crates/egui_demo_lib/src/demo/painting.rs
+++ b/crates/egui_demo_lib/src/demo/painting.rs
@@ -82,7 +82,7 @@ impl super::Demo for Painting {
             .open(open)
             .default_size(vec2(512.0, 512.0))
             .vscroll(false)
-            .show(ctx, move |ui| self.ui(ui));
+            .show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/crates/egui_demo_lib/src/demo/scrolling.rs b/crates/egui_demo_lib/src/demo/scrolling.rs
index deddcb3c3..b970b3264 100644
--- a/crates/egui_demo_lib/src/demo/scrolling.rs
+++ b/crates/egui_demo_lib/src/demo/scrolling.rs
@@ -34,7 +34,7 @@ impl super::Demo for Scrolling {
         egui::Window::new(self.name())
             .open(open)
             .resizable(false)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
diff --git a/crates/egui_demo_lib/src/demo/sliders.rs b/crates/egui_demo_lib/src/demo/sliders.rs
index e17dc9b5c..035a34d07 100644
--- a/crates/egui_demo_lib/src/demo/sliders.rs
+++ b/crates/egui_demo_lib/src/demo/sliders.rs
@@ -46,7 +46,7 @@ impl super::Demo for Sliders {
         egui::Window::new(self.name())
             .open(open)
             .resizable(false)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
diff --git a/crates/egui_demo_lib/src/demo/table_demo.rs b/crates/egui_demo_lib/src/demo/table_demo.rs
index 494914a15..355f052e1 100644
--- a/crates/egui_demo_lib/src/demo/table_demo.rs
+++ b/crates/egui_demo_lib/src/demo/table_demo.rs
@@ -40,7 +40,7 @@ impl super::Demo for TableDemo {
             .open(open)
             .resizable(true)
             .default_width(400.0)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
diff --git a/crates/egui_demo_lib/src/demo/tests.rs b/crates/egui_demo_lib/src/demo/tests.rs
index 294f07289..700d4afaf 100644
--- a/crates/egui_demo_lib/src/demo/tests.rs
+++ b/crates/egui_demo_lib/src/demo/tests.rs
@@ -124,7 +124,7 @@ impl super::Demo for ManualLayoutTest {
         egui::Window::new(self.name())
             .resizable(false)
             .open(open)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
@@ -207,12 +207,10 @@ impl super::Demo for TableTest {
     }
 
     fn show(&mut self, ctx: &egui::Context, open: &mut bool) {
-        egui::Window::new(self.name())
-            .open(open)
-            .show(ctx, move |ui| {
-                use super::View as _;
-                self.ui(ui);
-            });
+        egui::Window::new(self.name()).open(open).show(ctx, |ui| {
+            use super::View as _;
+            self.ui(ui);
+        });
     }
 }
 
@@ -328,7 +326,7 @@ impl super::Demo for InputTest {
         egui::Window::new(self.name())
             .open(open)
             .resizable(false)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
@@ -466,7 +464,7 @@ impl super::Demo for WindowResizeTest {
             .vscroll(false)
             .resizable(true)
             .default_height(300.0)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 ui.label("Shows how you can fill an area with a widget.");
                 let mut text = clone.text.write().unwrap();
                 ui.add_sized(ui.available_size(), TextEdit::multiline(&mut *text));
diff --git a/crates/egui_demo_lib/src/demo/text_edit.rs b/crates/egui_demo_lib/src/demo/text_edit.rs
index b1ebf42a2..484725bba 100644
--- a/crates/egui_demo_lib/src/demo/text_edit.rs
+++ b/crates/egui_demo_lib/src/demo/text_edit.rs
@@ -22,7 +22,7 @@ impl super::Demo for TextEdit {
         egui::Window::new(self.name())
             .open(open)
             .resizable(false)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
diff --git a/crates/egui_demo_lib/src/demo/widget_gallery.rs b/crates/egui_demo_lib/src/demo/widget_gallery.rs
index b34f3af96..60799570e 100644
--- a/crates/egui_demo_lib/src/demo/widget_gallery.rs
+++ b/crates/egui_demo_lib/src/demo/widget_gallery.rs
@@ -54,7 +54,7 @@ impl super::Demo for WidgetGallery {
             .open(open)
             .resizable(true)
             .default_width(280.0)
-            .show(ctx, move |ui| {
+            .show(ctx, |ui| {
                 use super::View as _;
                 self.ui(ui);
             });
diff --git a/crates/egui_demo_lib/src/demo/window_options.rs b/crates/egui_demo_lib/src/demo/window_options.rs
index f53bfb77b..f9d40ad0d 100644
--- a/crates/egui_demo_lib/src/demo/window_options.rs
+++ b/crates/egui_demo_lib/src/demo/window_options.rs
@@ -69,7 +69,7 @@ impl super::Demo for WindowOptions {
         if anchored {
             window = window.anchor(anchor, anchor_offset);
         }
-        window.show(ctx, move |ui| self.ui(ui));
+        window.show(ctx, |ui| self.ui(ui));
     }
 }
 
diff --git a/examples/confirm_exit/src/main.rs b/examples/confirm_exit/src/main.rs
index 7494e2b86..72f65838e 100644
--- a/examples/confirm_exit/src/main.rs
+++ b/examples/confirm_exit/src/main.rs
@@ -55,7 +55,7 @@ impl eframe::App for MyApp {
             egui::Window::new("Do you want to quit?")
                 .collapsible(false)
                 .resizable(false)
-                .show(ctx, move |ui| {
+                .show(ctx, |ui| {
                     ui.horizontal(|ui| {
                         if ui.button("Cancel").clicked() {
                             data.write().unwrap().show_confirmation_dialog = false;
diff --git a/examples/hello_world_par/src/main.rs b/examples/hello_world_par/src/main.rs
index f1b92d7b9..d0a8bbe46 100644
--- a/examples/hello_world_par/src/main.rs
+++ b/examples/hello_world_par/src/main.rs
@@ -51,20 +51,18 @@ impl ThreadState {
         let pos = egui::pos2(16.0, 128.0 * (thread_nr as f32 + 1.0));
         let clone = self.clone();
         let title = self.data.read().unwrap().title.clone();
-        egui::Window::new(title)
-            .default_pos(pos)
-            .show(ctx, move |ui| {
-                let data = &mut *clone.data.write().unwrap();
-                ui.horizontal(|ui| {
-                    ui.label("Your name: ");
-                    ui.text_edit_singleline(&mut data.name);
-                });
-                ui.add(egui::Slider::new(&mut data.age, 0..=120).text("age"));
-                if ui.button("Click each year").clicked() {
-                    data.age += 1;
-                }
-                ui.label(format!("Hello '{}', age {}", data.name, data.age));
+        egui::Window::new(title).default_pos(pos).show(ctx, |ui| {
+            let data = &mut *clone.data.write().unwrap();
+            ui.horizontal(|ui| {
+                ui.label("Your name: ");
+                ui.text_edit_singleline(&mut data.name);
             });
+            ui.add(egui::Slider::new(&mut data.age, 0..=120).text("age"));
+            if ui.button("Click each year").clicked() {
+                data.age += 1;
+            }
+            ui.label(format!("Hello '{}', age {}", data.name, data.age));
+        });
     }
 }
 
@@ -147,7 +145,7 @@ impl eframe::App for MyApp {
             return;
         }
         let data = self.data.clone();
-        egui::Window::new("Main thread").show(ctx, move |ui| {
+        egui::Window::new("Main thread").show(ctx, |ui| {
             if ui.button("Spawn another thread").clicked() {
                 data.write().unwrap().spawn_thread();
                 ui.ctx()