Add FPS overlay to desktop_request_redraw test

Cargo.toml

@@ -3639,6 +3639,7 @@ hidden = true
 name = "desktop_request_redraw"
 path = "tests/window/desktop_request_redraw.rs"
 doc-scrape-examples = true
+required-features = ["bevy_dev_tools"]
 
 [package.metadata.example.desktop_request_redraw]
 hidden = true

tests/window/desktop_request_redraw.rs

@@ -1,10 +1,32 @@
 //! Desktop request redraw
-use bevy::{prelude::*, window::RequestRedraw, winit::WinitSettings};
+use bevy::{
+    dev_tools::fps_overlay::{FpsOverlayConfig, FpsOverlayPlugin},
+    prelude::*,
+    window::RequestRedraw,
+    winit::WinitSettings,
+};
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
         .add_plugins(MeshPickingPlugin)
+        // Enable the FPS overlay with a high resolution refresh interval. This makes it
+        // easier to validate that UpdateMode is behaving correctly when desktop_app is used.
+        // The FPS counter should essentially pause when the cube is not rotating and should
+        // update rapidly when the cube is rotating or there is input (e.g. moving the mouse).
+        //
+        // Left and Right clicking the cube should roggle rotation on/off.
+        .add_plugins(FpsOverlayPlugin {
+            config: FpsOverlayConfig {
+                text_config: TextFont {
+                    font_size: 12.0,
+                    ..default()
+                },
+                text_color: Color::srgb(0.0, 1.0, 0.0),
+                refresh_interval: core::time::Duration::from_millis(16),
+                ..default()
+            },
+        })
         .insert_resource(WinitSettings::desktop_app())
         .add_systems(Startup, setup)
         .add_systems(Update, (update, redraw.after(update)))